From 26105034da4fcce7ac883c899d781f016559310d Mon Sep 17 00:00:00 2001
From: ruki <waruqi@gmail.com>
Date: Thu, 8 Nov 2018 00:38:48 +0800
Subject: switch to vuepress

---
 node_modules/svgo/.bin/svgo                        |    1 +
 node_modules/svgo/.npmignore                       |   11 +
 node_modules/svgo/.svgo.yml                        |   68 +
 node_modules/svgo/CHANGELOG.md                     |  421 ++
 node_modules/svgo/LICENSE                          |   55 +
 node_modules/svgo/Makefile                         |   21 +
 node_modules/svgo/README.md                        |  155 +
 node_modules/svgo/README.ru.md                     |  155 +
 node_modules/svgo/bin/svgo                         |    3 +
 node_modules/svgo/lib/svgo.js                      |   80 +
 node_modules/svgo/lib/svgo/coa.js                  |  581 ++
 node_modules/svgo/lib/svgo/config.js               |  212 +
 node_modules/svgo/lib/svgo/js2svg.js               |  352 ++
 node_modules/svgo/lib/svgo/jsAPI.js                |  298 +
 node_modules/svgo/lib/svgo/plugins.js              |   98 +
 node_modules/svgo/lib/svgo/svg2js.js               |  187 +
 node_modules/svgo/lib/svgo/tools.js                |  147 +
 node_modules/svgo/node_modules/.bin/csso           |    1 +
 node_modules/svgo/node_modules/.bin/js-yaml        |    1 +
 node_modules/svgo/node_modules/.bin/mkdirp         |    1 +
 .../svgo/node_modules/esprima/.bin/esparse         |    1 +
 .../svgo/node_modules/esprima/.bin/esvalidate      |    1 +
 node_modules/svgo/node_modules/esprima/ChangeLog   |  174 +
 node_modules/svgo/node_modules/esprima/LICENSE.BSD |   21 +
 node_modules/svgo/node_modules/esprima/README.md   |   27 +
 .../svgo/node_modules/esprima/bin/esparse.js       |  126 +
 .../svgo/node_modules/esprima/bin/esvalidate.js    |  199 +
 node_modules/svgo/node_modules/esprima/esprima.js  | 5740 ++++++++++++++++++++
 .../svgo/node_modules/esprima/package.json         |   99 +
 .../svgo/node_modules/js-yaml/.bin/js-yaml         |    1 +
 .../svgo/node_modules/js-yaml/CHANGELOG.md         |  409 ++
 node_modules/svgo/node_modules/js-yaml/LICENSE     |   21 +
 node_modules/svgo/node_modules/js-yaml/README.md   |  295 +
 .../svgo/node_modules/js-yaml/bin/js-yaml.js       |  132 +
 .../svgo/node_modules/js-yaml/dist/js-yaml.js      | 3855 +++++++++++++
 .../svgo/node_modules/js-yaml/dist/js-yaml.min.js  |    3 +
 node_modules/svgo/node_modules/js-yaml/index.js    |    7 +
 .../svgo/node_modules/js-yaml/lib/js-yaml.js       |   39 +
 .../node_modules/js-yaml/lib/js-yaml/common.js     |   59 +
 .../node_modules/js-yaml/lib/js-yaml/dumper.js     |  801 +++
 .../node_modules/js-yaml/lib/js-yaml/exception.js  |   43 +
 .../node_modules/js-yaml/lib/js-yaml/loader.js     | 1587 ++++++
 .../svgo/node_modules/js-yaml/lib/js-yaml/mark.js  |   76 +
 .../node_modules/js-yaml/lib/js-yaml/schema.js     |  108 +
 .../js-yaml/lib/js-yaml/schema/core.js             |   18 +
 .../js-yaml/lib/js-yaml/schema/default_full.js     |   25 +
 .../js-yaml/lib/js-yaml/schema/default_safe.js     |   28 +
 .../js-yaml/lib/js-yaml/schema/failsafe.js         |   17 +
 .../js-yaml/lib/js-yaml/schema/json.js             |   25 +
 .../svgo/node_modules/js-yaml/lib/js-yaml/type.js  |   61 +
 .../js-yaml/lib/js-yaml/type/binary.js             |  135 +
 .../node_modules/js-yaml/lib/js-yaml/type/bool.js  |   35 +
 .../node_modules/js-yaml/lib/js-yaml/type/float.js |  105 +
 .../node_modules/js-yaml/lib/js-yaml/type/int.js   |  168 +
 .../js-yaml/lib/js-yaml/type/js/function.js        |   84 +
 .../js-yaml/lib/js-yaml/type/js/regexp.js          |   60 +
 .../js-yaml/lib/js-yaml/type/js/undefined.js       |   28 +
 .../node_modules/js-yaml/lib/js-yaml/type/map.js   |    8 +
 .../node_modules/js-yaml/lib/js-yaml/type/merge.js |   12 +
 .../node_modules/js-yaml/lib/js-yaml/type/null.js  |   34 +
 .../node_modules/js-yaml/lib/js-yaml/type/omap.js  |   44 +
 .../node_modules/js-yaml/lib/js-yaml/type/pairs.js |   53 +
 .../node_modules/js-yaml/lib/js-yaml/type/seq.js   |    8 +
 .../node_modules/js-yaml/lib/js-yaml/type/set.js   |   29 +
 .../node_modules/js-yaml/lib/js-yaml/type/str.js   |    8 +
 .../js-yaml/lib/js-yaml/type/timestamp.js          |   88 +
 .../node_modules/js-yaml/node_modules/.bin/esparse |    1 +
 .../js-yaml/node_modules/.bin/esvalidate           |    1 +
 .../svgo/node_modules/js-yaml/package.json         |   46 +
 node_modules/svgo/package.json                     |   70 +
 node_modules/svgo/plugins/_collections.js          | 2529 +++++++++
 node_modules/svgo/plugins/_path.js                 |  962 ++++
 node_modules/svgo/plugins/_transforms.js           |  308 ++
 .../svgo/plugins/addAttributesToSVGElement.js      |   57 +
 .../svgo/plugins/addClassesToSVGElement.js         |   64 +
 node_modules/svgo/plugins/cleanupAttrs.js          |   56 +
 .../svgo/plugins/cleanupEnableBackground.js        |   84 +
 node_modules/svgo/plugins/cleanupIDs.js            |  208 +
 node_modules/svgo/plugins/cleanupListOfValues.js   |  141 +
 node_modules/svgo/plugins/cleanupNumericValues.js  |   76 +
 node_modules/svgo/plugins/collapseGroups.js        |   91 +
 node_modules/svgo/plugins/convertColors.js         |  127 +
 node_modules/svgo/plugins/convertPathData.js       |  957 ++++
 node_modules/svgo/plugins/convertShapeToPath.js    |  103 +
 node_modules/svgo/plugins/convertStyleToAttrs.js   |  117 +
 node_modules/svgo/plugins/convertTransform.js      |  364 ++
 node_modules/svgo/plugins/mergePaths.js            |   71 +
 node_modules/svgo/plugins/minifyStyles.js          |   45 +
 node_modules/svgo/plugins/moveElemsAttrsToGroup.js |  126 +
 node_modules/svgo/plugins/moveGroupAttrsToElems.js |   63 +
 node_modules/svgo/plugins/removeAttrs.js           |  119 +
 node_modules/svgo/plugins/removeComments.js        |   27 +
 node_modules/svgo/plugins/removeDesc.js            |   32 +
 node_modules/svgo/plugins/removeDimensions.js      |   32 +
 node_modules/svgo/plugins/removeDoctype.js         |   40 +
 node_modules/svgo/plugins/removeEditorsNSData.js   |   65 +
 node_modules/svgo/plugins/removeElementsByAttr.js  |   80 +
 node_modules/svgo/plugins/removeEmptyAttrs.js      |   29 +
 node_modules/svgo/plugins/removeEmptyContainers.js |   32 +
 node_modules/svgo/plugins/removeEmptyText.js       |   59 +
 node_modules/svgo/plugins/removeHiddenElems.js     |  218 +
 node_modules/svgo/plugins/removeMetadata.js        |   23 +
 .../svgo/plugins/removeNonInheritableGroupAttrs.js |   40 +
 node_modules/svgo/plugins/removeRasterImages.js    |   28 +
 node_modules/svgo/plugins/removeStyleElement.js    |   23 +
 node_modules/svgo/plugins/removeTitle.js           |   24 +
 .../svgo/plugins/removeUnknownsAndDefaults.js      |  143 +
 node_modules/svgo/plugins/removeUnusedNS.js        |  107 +
 node_modules/svgo/plugins/removeUselessDefs.js     |   51 +
 .../svgo/plugins/removeUselessStrokeAndFill.js     |   92 +
 node_modules/svgo/plugins/removeViewBox.js         |   49 +
 node_modules/svgo/plugins/removeXMLNS.js           |   28 +
 node_modules/svgo/plugins/removeXMLProcInst.js     |   24 +
 node_modules/svgo/plugins/sortAttrs.js             |   81 +
 node_modules/svgo/plugins/transformsWithOnePath.js |  327 ++
 115 files changed, 26185 insertions(+)
 create mode 120000 node_modules/svgo/.bin/svgo
 create mode 100644 node_modules/svgo/.npmignore
 create mode 100644 node_modules/svgo/.svgo.yml
 create mode 100644 node_modules/svgo/CHANGELOG.md
 create mode 100644 node_modules/svgo/LICENSE
 create mode 100644 node_modules/svgo/Makefile
 create mode 100644 node_modules/svgo/README.md
 create mode 100644 node_modules/svgo/README.ru.md
 create mode 100755 node_modules/svgo/bin/svgo
 create mode 100644 node_modules/svgo/lib/svgo.js
 create mode 100644 node_modules/svgo/lib/svgo/coa.js
 create mode 100644 node_modules/svgo/lib/svgo/config.js
 create mode 100644 node_modules/svgo/lib/svgo/js2svg.js
 create mode 100644 node_modules/svgo/lib/svgo/jsAPI.js
 create mode 100644 node_modules/svgo/lib/svgo/plugins.js
 create mode 100644 node_modules/svgo/lib/svgo/svg2js.js
 create mode 100644 node_modules/svgo/lib/svgo/tools.js
 create mode 120000 node_modules/svgo/node_modules/.bin/csso
 create mode 120000 node_modules/svgo/node_modules/.bin/js-yaml
 create mode 120000 node_modules/svgo/node_modules/.bin/mkdirp
 create mode 120000 node_modules/svgo/node_modules/esprima/.bin/esparse
 create mode 120000 node_modules/svgo/node_modules/esprima/.bin/esvalidate
 create mode 100644 node_modules/svgo/node_modules/esprima/ChangeLog
 create mode 100644 node_modules/svgo/node_modules/esprima/LICENSE.BSD
 create mode 100644 node_modules/svgo/node_modules/esprima/README.md
 create mode 100755 node_modules/svgo/node_modules/esprima/bin/esparse.js
 create mode 100755 node_modules/svgo/node_modules/esprima/bin/esvalidate.js
 create mode 100644 node_modules/svgo/node_modules/esprima/esprima.js
 create mode 100644 node_modules/svgo/node_modules/esprima/package.json
 create mode 120000 node_modules/svgo/node_modules/js-yaml/.bin/js-yaml
 create mode 100644 node_modules/svgo/node_modules/js-yaml/CHANGELOG.md
 create mode 100644 node_modules/svgo/node_modules/js-yaml/LICENSE
 create mode 100644 node_modules/svgo/node_modules/js-yaml/README.md
 create mode 100755 node_modules/svgo/node_modules/js-yaml/bin/js-yaml.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/dist/js-yaml.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/dist/js-yaml.min.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/index.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/common.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/dumper.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/exception.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/loader.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/mark.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema/core.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema/default_full.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema/default_safe.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema/failsafe.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema/json.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/binary.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/bool.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/float.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/int.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/js/function.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/js/regexp.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/js/undefined.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/map.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/merge.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/null.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/omap.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/pairs.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/seq.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/set.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/str.js
 create mode 100644 node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/timestamp.js
 create mode 120000 node_modules/svgo/node_modules/js-yaml/node_modules/.bin/esparse
 create mode 120000 node_modules/svgo/node_modules/js-yaml/node_modules/.bin/esvalidate
 create mode 100644 node_modules/svgo/node_modules/js-yaml/package.json
 create mode 100644 node_modules/svgo/package.json
 create mode 100644 node_modules/svgo/plugins/_collections.js
 create mode 100644 node_modules/svgo/plugins/_path.js
 create mode 100644 node_modules/svgo/plugins/_transforms.js
 create mode 100644 node_modules/svgo/plugins/addAttributesToSVGElement.js
 create mode 100644 node_modules/svgo/plugins/addClassesToSVGElement.js
 create mode 100644 node_modules/svgo/plugins/cleanupAttrs.js
 create mode 100644 node_modules/svgo/plugins/cleanupEnableBackground.js
 create mode 100644 node_modules/svgo/plugins/cleanupIDs.js
 create mode 100644 node_modules/svgo/plugins/cleanupListOfValues.js
 create mode 100644 node_modules/svgo/plugins/cleanupNumericValues.js
 create mode 100644 node_modules/svgo/plugins/collapseGroups.js
 create mode 100644 node_modules/svgo/plugins/convertColors.js
 create mode 100644 node_modules/svgo/plugins/convertPathData.js
 create mode 100644 node_modules/svgo/plugins/convertShapeToPath.js
 create mode 100644 node_modules/svgo/plugins/convertStyleToAttrs.js
 create mode 100644 node_modules/svgo/plugins/convertTransform.js
 create mode 100644 node_modules/svgo/plugins/mergePaths.js
 create mode 100644 node_modules/svgo/plugins/minifyStyles.js
 create mode 100644 node_modules/svgo/plugins/moveElemsAttrsToGroup.js
 create mode 100644 node_modules/svgo/plugins/moveGroupAttrsToElems.js
 create mode 100644 node_modules/svgo/plugins/removeAttrs.js
 create mode 100644 node_modules/svgo/plugins/removeComments.js
 create mode 100644 node_modules/svgo/plugins/removeDesc.js
 create mode 100644 node_modules/svgo/plugins/removeDimensions.js
 create mode 100644 node_modules/svgo/plugins/removeDoctype.js
 create mode 100644 node_modules/svgo/plugins/removeEditorsNSData.js
 create mode 100644 node_modules/svgo/plugins/removeElementsByAttr.js
 create mode 100644 node_modules/svgo/plugins/removeEmptyAttrs.js
 create mode 100644 node_modules/svgo/plugins/removeEmptyContainers.js
 create mode 100644 node_modules/svgo/plugins/removeEmptyText.js
 create mode 100644 node_modules/svgo/plugins/removeHiddenElems.js
 create mode 100644 node_modules/svgo/plugins/removeMetadata.js
 create mode 100644 node_modules/svgo/plugins/removeNonInheritableGroupAttrs.js
 create mode 100644 node_modules/svgo/plugins/removeRasterImages.js
 create mode 100644 node_modules/svgo/plugins/removeStyleElement.js
 create mode 100644 node_modules/svgo/plugins/removeTitle.js
 create mode 100644 node_modules/svgo/plugins/removeUnknownsAndDefaults.js
 create mode 100644 node_modules/svgo/plugins/removeUnusedNS.js
 create mode 100644 node_modules/svgo/plugins/removeUselessDefs.js
 create mode 100644 node_modules/svgo/plugins/removeUselessStrokeAndFill.js
 create mode 100644 node_modules/svgo/plugins/removeViewBox.js
 create mode 100644 node_modules/svgo/plugins/removeXMLNS.js
 create mode 100644 node_modules/svgo/plugins/removeXMLProcInst.js
 create mode 100644 node_modules/svgo/plugins/sortAttrs.js
 create mode 100644 node_modules/svgo/plugins/transformsWithOnePath.js

(limited to 'node_modules/svgo')

diff --git a/node_modules/svgo/.bin/svgo b/node_modules/svgo/.bin/svgo
new file mode 120000
index 00000000..746740a5
--- /dev/null
+++ b/node_modules/svgo/.bin/svgo
@@ -0,0 +1 @@
+../bin/svgo
\ No newline at end of file
diff --git a/node_modules/svgo/.npmignore b/node_modules/svgo/.npmignore
new file mode 100644
index 00000000..aab1a69a
--- /dev/null
+++ b/node_modules/svgo/.npmignore
@@ -0,0 +1,11 @@
+docs
+examples
+test
+lib-cov
+.editorconfig
+.jshintignore
+.jshintrc
+.travis.yml
+lcov.info
+logo.svg
+CHANGELOG.MD
diff --git a/node_modules/svgo/.svgo.yml b/node_modules/svgo/.svgo.yml
new file mode 100644
index 00000000..a2b6e520
--- /dev/null
+++ b/node_modules/svgo/.svgo.yml
@@ -0,0 +1,68 @@
+# replace default config
+
+# multipass: true
+# full: true
+
+plugins:
+
+  # - name
+  #
+  # or:
+  # - name: false
+  # - name: true
+  #
+  # or:
+  # - name:
+  #     param1: 1
+  #     param2: 2
+
+  - removeDoctype
+  - removeXMLProcInst
+  - removeComments
+  - removeMetadata
+  - removeXMLNS
+  - removeEditorsNSData
+  - cleanupAttrs
+  - minifyStyles
+  - convertStyleToAttrs
+  - cleanupIDs
+  - removeRasterImages
+  - removeUselessDefs
+  - cleanupNumericValues
+  - cleanupListOfValues
+  - convertColors
+  - removeUnknownsAndDefaults
+  - removeNonInheritableGroupAttrs
+  - removeUselessStrokeAndFill
+  - removeViewBox
+  - cleanupEnableBackground
+  - removeHiddenElems
+  - removeEmptyText
+  - convertShapeToPath
+  - moveElemsAttrsToGroup
+  - moveGroupAttrsToElems
+  - collapseGroups
+  - convertPathData
+  - convertTransform
+  - removeEmptyAttrs
+  - removeEmptyContainers
+  - mergePaths
+  - removeUnusedNS
+  - transformsWithOnePath
+  - sortAttrs
+  - removeTitle
+  - removeDesc
+  - removeDimensions
+  - removeAttrs
+  - removeElementsByAttr
+  - addClassesToSVGElement
+  - removeStyleElement
+  - addAttributesToSVGElement
+
+# configure the indent (default 4 spaces) used by `--pretty` here:
+#
+# @see https://github.com/svg/svgo/blob/master/lib/svgo/js2svg.js#L6 for more config options
+#
+# js2svg:
+#  pretty: true
+#  indent: '  '
diff --git a/node_modules/svgo/CHANGELOG.md b/node_modules/svgo/CHANGELOG.md
new file mode 100644
index 00000000..7a2084d7
--- /dev/null
+++ b/node_modules/svgo/CHANGELOG.md
@@ -0,0 +1,421 @@
+### [ [>](https://github.com/svg/svgo/tree/v0.7.2) ] 0.7.2 / 29.01.2017
+* Extended `currentColor` match conditions (string, rx, bool) (by @AlimovSV)
+* Fixed removing `<animate>` in `<stop>`.
+* Fixed removing same transform in inner element in `removeUnknownsAndDefaults`.
+* Fixed collapsing groups with same non-inheritable attribue.
+* Corrected removing of leading zero in case of exponential notation.
+
+### [ [>](https://github.com/svg/svgo/tree/v0.7.1) ] 0.7.1 / 27.09.2016
+* Reverted the requirement of Node.js to version 0.10.
+* Added `addAttributesToSVGElement` to the default config to allow using it with `--enable` option.
+* Added korean translation of “How it works” doc (by @primeiros).
+
+### [ [>](https://github.com/svg/svgo/tree/v0.7.0) ] 0.7.0 / 25.08.2016
+* Required Node.js version has increased to 0.12.
+* New plugins: `removeElementsByAttr` (by IDs or classes) by @elidupuis,
+  `addAttributesToSVGElement` by @gjjones,
+  `removeXMLNS` (for SVG inlining) by @ricardobeat.
+* Tests now correctly pass in Windows with CRLF line endings. Pretty print now accounts system line endings.
+* Fixed bugs with collapsing groups with masks and transforms in `collapseGroups`.
+* Fixed bugs with erroneous removing IDs in `cleanupIDs`.
+* Improved attributes sorting in `sortAttrs` by @darktrojan.
+* `addClassesToSVGElement` no more repeats classes (by @ricardobeat).
+
+### [ [>](https://github.com/svg/svgo/tree/v0.6.6) ] 0.6.6 / 25.04.2016
+* Corrected CSSO API usage
+
+### [ [>](https://github.com/svg/svgo/tree/v0.6.5) ] 0.6.5 / 25.04.2016
+* Extra content inserted by editors are now being removed within `<foreignObject>` as well thus fixing bug “Namespace prefix … is not defined“ after applying SVGO.
+* Doctype with entities declartion is now also being removed since svgo correctly parses them starting from the version [0.6.2](https://github.com/svg/svgo/tree/v0.6.2).
+* Corrected `moveGroupAttrsToElems` not to move attributes to `g` content if it's referenced (has an `id`).
+* `collapseGroups` now don't collapse a group if it has an animated attribute (SMIL).
+
+### [ [>](https://github.com/svg/svgo/tree/v0.6.4) ] 0.6.4 / 05.04.2016
+* Fixed bug in “[convertStyleToAttrs](https://github.com/svg/svgo/blob/master/plugins/convertStyleToAttrs.js)” plugin with converting styling properties to non-existent attributes (which are normally removed later by `removeUnknownsAndDefaults`).
+* Added `--indent` option to style pretty-printed SVG. (e.g. `--indent 2`) (by @scurker).
+* Added `currentColor` param to `convertColors` plugin for converting values like `fill` and `stroke` to `currentColor` (by @scurker).
+* Bumped CSSO to the current version and used [its new shiny API](https://github.com/css/csso#api) (thanks to @lahmatiy).
+
+### [ [>](https://github.com/svg/svgo/tree/v0.6.3) ] 0.6.3 / 20.03.2016
+* Smart rounding (introduced in 0.4.5) now applies only when rounding is needed, thus making subsequent passes more stable.
+* Fixed regression in converting curves to arcs.
+* `xlink:href` references are now being checked by local name `href`, thus correctly working with another namespace prefix.
+* Fixed `id` removing with disabled `plugins/convertStyleToAttrs.js`.
+
+### [ [>](https://github.com/svg/svgo/tree/v0.6.2) ] 0.6.2 / 08.03.2016
+* Better error handling and messaging improvements.
+* SVG files with XML entities (e.g. from Adobe Illustrator) are now correctly being parsed.
+* Fixed error on converting curves to arcs.
+* Corrected rounding in subsequent passes with `--multipass` option.
+* Data URI option now handles charset (by @holymonson)
+* Tranformations are no longer moved to group if there is a mask (`plugins/moveElemsAttrsToGroup.js`).
+* Fixed matrix decomposition losing sign in case like `[1, 0, 0, -1, 0, 0]` (`scale(1 -1)`).
+* Fixed crash on uppercased color name.
+* Paths with `id` and without `stroke-width` aren't being trasformed now since `stroke-width` may be applied later.
+
+### [ [>](https://github.com/svg/svgo/tree/v0.6.1) ] 0.6.1 / 21.11.2015
+* Added option `--quiet` to suppress output (by @phihag).
+* Removed `lib-cov` folder from the package, which was erroneously included before.
+* Fixed errors in “[minifyStyles](https://github.com/svg/svgo/blob/master/plugins/minifyStyles.js)” when there are `<style>` elements with `CDATA` content or without content at all.
+* Amended transform functions parsing to prevent errors when there are no separators between numbers (which isn't allowed by syntax, but understood by browsers).
+
+### [ [>](https://github.com/svg/svgo/tree/v0.6.0) ] 0.6.0 / 08.11.2015
+* New optimization: circular curves now being converted to arcs. A notable improvement for circles within paths.
+* New plugin “[minifyStyles](https://github.com/svg/svgo/blob/master/plugins/minifyStyles.js)” which minifies `<style>` elments content with CSSO by @strarsis (svgo still doesn't understand its content)
+* New plugin “[removeStyleElement](https://github.com/svg/svgo/blob/master/plugins/removeStyleElement.js)” (disabled by default) by @betsydupuis.
+* Fixed issues wuth parsing numbers with exponent fraction (could happen with high precision >= 7).
+* Fixed rounding error due to incorrect preserving of precision in transformations.
+* Fixed shortand curve distortion due to converted previous curve to not a curve.
+* Fixed interoperability issue with `precision` cli-option and `full` config.
+* Fixed an error produced by “[removeUnknownsAndDefaults](https://github.com/svg/svgo/blob/master/plugins/removeUnknownsAndDefaults.js)” by @thiakil
+* Another Inkscape prefix namespace is being removed.
+* Fixed an issue in [moveElemsAttrsToGroup“](https://github.com/svg/svgo/blob/master/plugins/moveElemsAttrsToGroup“.js)” with transforms moved around `clip-path`.
+
+### [ [>](https://github.com/svg/svgo/tree/v0.5.6) ] 0.5.6 / 13.08.2015
+* Fixed paths removing.
+
+### [ [>](https://github.com/svg/svgo/tree/v0.5.5) ] 0.5.5 / 05.08.2015
+* Reverted debugging changes.
+
+### [ [>](https://github.com/svg/svgo/tree/v0.5.4) ] 0.5.4 / 05.08.2015
+* New parameter `useShortTags` by @bradbarrow. Now svgo can produce correct non-selfclosing tags (useful in HTML in old browsers).
+* Fixed failing on empty transformation (which could be produced by two opposite).
+* Fixed removing paths which have numbers with exponent notation.
+* Fixed a bug with arc transformation.
+* Some typo fixes.
+
+### [ [>](https://github.com/svg/svgo/tree/v0.5.3) ] 0.5.3 / 21.06.2015
+* Fixed breaking related to rounding functions in “[convertTransform](https://github.com/svg/svgo/blob/master/plugins/convertTransform.js)”.
+* Fixed a bug with ID in animations not being worked on by “[cleanupIDs](https://github.com/svg/svgo/blob/master/plugins/cleanupIDs.js)”.
+* Fixed a bug with quoted reference in `url()`.
+* Now, if there are several same IDs in the document, then the first one is used and others are being removed.
+* New command-line option `--show-plugins` displaying list of plugins.
+* Two new optional plugins: “[removeDimensions](https://github.com/svg/svgo/blob/master/plugins/removeDimensions.js)” (removes `width` and `height` if there is `viewBox`) and “[removeAttrsPlugin](https://github.com/svg/svgo/blob/master/plugins/removeAttrs.js)” (by @bennyschudel).
+
+### [ [>](https://github.com/svg/svgo/tree/v0.5.2) ] 0.5.2 / 24.05.2015
+* Introduced new `transformPrecision` option for better image quality (defaults to 5) in “[convertTransform](https://github.com/svg/svgo/blob/master/plugins/convertTransform.js)” and “[convertPathData](https://github.com/svg/svgo/blob/master/plugins/convertPathData.js)” (for the purpose of applying transformations) plugins.
+* Matrix transformations now can be decomposed into a combination of few simple transforms like `translate`, `rotate`, `scale`.
+* Arcs (paths `arcto` command) are now correctly being transformed into another arcs without being converting to Bezier curves.
+* Fixed an issue with “[mergePaths](https://github.com/svg/svgo/blob/master/plugins/mergePaths.js)” failing to detect paths intersection in some cases.
+* Fixed a bug with “[removeUnknownsAndDefaults](https://github.com/svg/svgo/blob/master/plugins/removeUnknownsAndDefaults.js)” removing some paths, which was introduced in [v0.5.1](https://github.com/svg/svgo/tree/v0.5.1).
+* Fixed a bug with transformation having `rotate()` with optional parameters.
+* Patterns with inherited attributes are no longer being removed.
+* Styles are no longer being removed from `<desc>` (by @dennari).
+* SVGO no longer breaks during parsing.
+* Added `clone()` method to JSAPI (by @jakearchibald)
+
+### [ [>](https://github.com/svg/svgo/tree/v0.5.1) ] 0.5.1 / 30.03.2015
+* added new command-line option to set precision in floating point numbers.
+* fixed all known image-disruptive bugs
+* Notably [mergePaths](https://github.com/svg/svgo/blob/master/plugins/mergePaths.js) plugin now checks for possible intersections to avoid side-effects
+* new plugin [removeUselessDefs](https://github.com/svg/svgo/blob/master/plugins/removeUselessDefs.js) to remove elements in ``<defs>`` and similar non-rendering elements without an ``id`` and thus cannot be used
+* fix for ``--multipass`` command line option (by @dfilatov)
+* improved [cleanupEnableBackground](https://github.com/svg/svgo/blob/master/plugins/cleanupEnableBackground.js) and [convertColors](https://github.com/svg/svgo/blob/master/plugins/convertColors.js) plugins (by @YetiOr)
+* new plugin for image manipulation [cleanupListOfValues](https://github.com/svg/svgo/blob/master/plugins/cleanupListOfValues.js) (by @kiyopikko)
+* fixed fail on comments after closing root ``</svg>`` tag
+* updated parsing to account meaningful spaces in ``<text>``
+* ``data-*`` attributes are now preserved in [removeUnknownsAndDefaults](https://github.com/svg/svgo/blob/master/plugins/removeUnknownsAndDefaults.js)
+* prevented plugins from failing in ``<foreignObject>``
+* [cleanupNumericValues](https://github.com/svg/svgo/blob/master/plugins/cleanupNumericValues.js) plugin now converts other units to pixels (if it's better)
+* [removeUselessStrokeAndFill](https://github.com/svg/svgo/blob/master/plugins/removeUselessStrokeAndFill.js) plugin is enabled again with correct work in case of inherited attributes
+* fixed fail on images with incorrect paths like ``<path d="z"/>``
+* svgo now understands if an input is a folder (remember, you can set output to folder as well)
+* added support for some properties from SVG 2 like ``vector-effect="non-scaling-stroke"``
+* removed option to remove an ``id`` on root ``<svg>`` tag in [removeUnknownsAndDefaults](https://github.com/svg/svgo/blob/master/plugins/removeUnknownsAndDefaults.js) since it's already being done in [cleanupIDs](https://github.com/svg/svgo/blob/master/plugins/cleanupIDs.js)
+
+### [ [>](https://github.com/svg/svgo/tree/v0.5.0) ] 0.5.0 / 05.11.2014
+* added ``--multipass`` command line option which repeatedly applies optimizations like collapsing groups (by @dfilatov)
+* exposed JSAPI as a factory method (by @mistakster)
+* added removeDesc plugin (by @dwabyick), disabled by default
+* [removeUselessStrokeAndFill](https://github.com/svg/svgo/blob/master/plugins/removeUselessStrokeAndFill.js) plugin is disabled by default since it's unable to check inherited properties
+* transformations now apply to paths with arcs in [plugins/convertPathData](https://github.com/svg/svgo/blob/master/plugins/convertPathData.js)
+* a lot of bug fixes mostly related to transformations
+
+### [ [>](https://github.com/svg/svgo/tree/v0.4.5) ] 0.4.5 / 02.08.2014
+* significally improved plugin [plugins/convertPathData](https://github.com/svg/svgo/blob/master/plugins/convertPathData.js):
+  - Now data is being written relative or absolute whichever is shorter. You can turn it off by setting ``utilizeAbsolute`` to ``false``.
+  - Smarter rounding: values like 2.499 now rounds to 2.5. Rounding now takes in account accumulutive error meaning that points will not be misplaced due to rounding more than it neccessary.
+  - Fixed couple bugs.
+* ``--output`` option now can be a folder along with ``--folder``, thanks to @mako-taco.
+* [plugins/cleanupIDs](https://github.com/svg/svgo/blob/master/plugins/cleanupIDs.js) now have ``prefix`` option in case you want to combine multiple svg later (by @DanielMazurkiewicz).
+* Quotes now being escaped in attributes (by @ditesh).
+* Minor bugfixes.
+
+### [ [>](https://github.com/svg/svgo/tree/v0.4.4) ] 0.4.4 / 14.01.2014
+* new plugin [plugins/removeTitle](https://github.com/svg/svgo/blob/master/plugins/removeTitle.js) (disabled by default, close [#159](https://github.com/svg/svgo/issues/159))
+* plugins/convertPathData: skip data concatenation for z instruction in collapseRepeated
+* plugins/removeUnknownsAndDefaults: do not remove overriden attributes with default values (fix [#161](https://github.com/svg/svgo/issues/161) and [#168](https://github.com/svg/svgo/issues/168))
+* plugins/removeViewBox: disable by default (fix [#139](https://github.com/svg/svgo/issues/139))
+* update README with [gulp task](https://github.com/ben-eb/gulp-svgmin)
+
+### [ [>](https://github.com/svg/svgo/tree/v0.4.3) ] 0.4.3 / 02.01.2014
+* new plugin [plugins/convertShapeToPath](https://github.com/svg/svgo/blob/master/plugins/convertShapeToPath.js) (close [#96](https://github.com/svg/svgo/issues/96))
+* update sax version to fix [#140](https://github.com/svg/svgo/issues/140)
+* update deps
+
+### [ [>](https://github.com/svg/svgo/tree/v0.4.2) ] 0.4.2 / 19.12.2013
+* add `lcov.info` to npmignore
+* fix `js-yaml` version to suppress deprecation warning in stdout
+
+### [ [>](https://github.com/svg/svgo/tree/v0.4.1) ] 0.4.1 / 18.11.2013
+* node >=0.8.0
+
+### [ [>](https://github.com/svg/svgo/tree/v0.4.0) ] 0.4.0 / 18.11.2013
+* merge almost all pull-requests
+* update dependencies
+
+### [ [>](https://github.com/svg/svgo/tree/v0.3.7) ] 0.3.7 / 24.06.2013
+* do not remove `result` attribute from filter primitives (fix [#122](https://github.com/svg/svgo/issues/122))
+* plugins/cleanupAttrs: replace newline with space when needed (fix [#119](https://github.com/svg/svgo/issues/119))
+* lib/coa: look for config file in current folder
+* lib/coa: always traverse all files in the given folder
+* deprecate svgo-grunt in favor of [grunt-svgmin](https://github.com/sindresorhus/grunt-svgmin)
+* re-enable node-coveralls
+
+### [ [>](https://github.com/svg/svgo/tree/v0.3.6) ] 0.3.6 / 06.06.2013
+* plugins/removeNonInheritableGroupAttrs: more attrs groups to exclude (fix [#116](https://github.com/svg/svgo/issues/116) & [#118](https://github.com/svg/svgo/issues/118))
+* lib/coa: optimize folder file by file (temp fix [#114](https://github.com/svg/svgo/issues/114))
+* `.jshintrc`: JSHint 2.0
+* temporarily disable node-coveralls
+
+### [ [>](https://github.com/svg/svgo/tree/v0.3.5) ] 0.3.5 / 07.05.2013
+* plugins/transformsWithOnePath: fix curves bounding box calculation
+* plugins/transformsWithOnePath: fix possible c+t or q+s bug
+
+
+### [ [>](https://github.com/svg/svgo/tree/v0.3.4) ] 0.3.4 / 06.05.2013
+* plugins/convertPathData: fix m->M bug in some cases
+* plugins/transformsWithOnePath: fix last point calculation for C/S/Q/T
+* plugins/mergePaths: add space delimiter between z and m
+
+### [ [>](https://github.com/svg/svgo/tree/v0.3.3) ] 0.3.3 / 05.05.2013
+* plugins/convertPathData: convert very first m to M, fix applyTransforms with translate() (fix [#112](https://github.com/svg/svgo/issues/112))
+* plugins/transformsWithOnePath: fix real width/height rounding; fix scale transform origin; reorder transforms
+* plugins/transformsWithOnePath: ability to set new width or height independently with auto rescaling
+
+### [ [>](https://github.com/svg/svgo/tree/v0.3.2) ] 0.3.2 / 03.05.2013
+* new plugin [plugins/sortAttrs](https://github.com/svg/svgo/blob/master/plugins/sortAttrs.js)
+* plugins/transformsWithOnePath: buggy hcrop (fix [#111](https://github.com/svg/svgo/issues/111))
+* Impossible to set output presision to 0 (no fractional part) (fix [#110](https://github.com/svg/svgo/issues/110))
+* Istanbul + coveralls.io
+* update README with NPM version from badge.fury.io
+* update README with dependency status from gemnasium.com
+* npmignore unneeded files
+* reoptimized project logo
+
+### [ [>](https://github.com/svg/svgo/tree/v0.3.1) ] 0.3.1 / 15.04.2013
+* plugins/transformsWithOnePath: resize SVG and automatically rescale inner Path
+* better errors handling
+
+### [ [>](https://github.com/svg/svgo/tree/v0.3.0) ] 0.3.0 / 12.04.2013
+* global refactoring: getting rid of the many dependencies
+* new plugin [plugins/mergePaths](https://github.com/svg/svgo/blob/master/plugins/mergePaths.js)
+* new plugin [plugins/transformsWithOnePath](https://github.com/svg/svgo/blob/master/plugins/transformsWithOnePath.js) (renamed and featured `cropAndCenterAlongPath`)
+* config: replace default config with `full: true`
+* coa: JSON string as value of `--config`
+* coa: different types of Data URI strings (close [#105](https://github.com/svg/svgo/issues/105))
+* plugins/_transforms: allow spaces at the beginning of transform
+* Travis CI: Nodejs 0.10 & 0.11
+* `node.extend` → `whet.extend`
+* update `.gitignore`
+* update docs
+
+### [ [>](https://github.com/svg/svgo/tree/v0.2.4) ] 0.2.4 / 05.04.2013
+* new plugin [plugins/cropAndCenterAlongPath](https://github.com/svg/svgo/blob/master/plugins/cropAndCenterAlongPath.js) for the [Fontello](https://github.com/fontello) project
+
+### [ [>](https://github.com/svg/svgo/tree/v0.2.3) ] 0.2.3 / 22.02.2013
+* new plugin [plugins/removeNonInheritableGroupAttrs](https://github.com/svg/svgo/blob/master/plugins/removeNonInheritableGroupAttrs.js) (fix [#101](https://github.com/svg/svgo/issues/101))
+* new plugin [plugins/removeRasterImages](https://github.com/svg/svgo/blob/master/plugins/removeRasterImages.js) (close [#98](https://github.com/svg/svgo/issues/98))
+* plugins/convertTransform: bug with trailing spaces in transform value string (fix [#103](https://github.com/svg/svgo/issues/103))
+
+### [ [>](https://github.com/svg/svgo/tree/v0.2.2) ] 0.2.2 / 09.02.2013
+* plugins/convertTransforms: wrong translate() shorthand (fix [#94](https://github.com/svg/svgo/issues/94))
+* [yaml.js](https://github.com/jeremyfa/yaml.js) → [js-yaml](https://github.com/nodeca/js-yaml)
+* update outdated deps
+
+### [ [>](https://github.com/svg/svgo/tree/v0.2.1) ] 0.2.1 / 18.01.2013
+* plugins/moveElemsAttrsToGroup + plugins/moveGroupAttrsToElems: move or just leave transform attr from Group to the inner Path Elems (close [#86](https://github.com/svg/svgo/issues/86))
+* plugins/removeViewBox: doesn't catch floating-point numbers (fix [#88](https://github.com/svg/svgo/issues/88))
+* plugins/cleanupEnableBackground: doesn't catch floating-point numbers (fix [#89](https://github.com/svg/svgo/issues/89))
+* plugins/cleanupNumericValues: wrong floating-point numbers regexp (fix [#92](https://github.com/svg/svgo/issues/92))
+* SVG file generated by fontcustom.com not properly compressed (fix [#90](https://github.com/svg/svgo/issues/90))
+* `README.ru.md`: стилизация русского языка, улучшение языковых конструкций, правка ошибок (close [#91](https://github.com/svg/svgo/issues/91))
+* minor JSHint warning fix
+
+### [ [>](https://github.com/svg/svgo/tree/v0.2.0) ] 0.2.0 / 23.12.2012
+* plugins/convertPathData: apply transforms to Path pata (close [#33](https://github.com/svg/svgo/issues/33))
+* plugins/convertPathData: `-1.816-9.278.682-13.604` parsing error (fix [#85](https://github.com/svg/svgo/issues/85))
+* plugins/convertTransform: `translate(10, 0)` eq `translate(10)`, but not `translate(10, 10)` eq `translate(10)` (fix [#83](https://github.com/svg/svgo/issues/83))
+* run plugins/cleanupIDs before plugins/collapseGroups (fix [#84](https://github.com/svg/svgo/issues/84))
+* update `.gitignore`
+
+### [ [>](https://github.com/svg/svgo/tree/v0.1.9) ] 0.1.9 / 17.12.2012
+* plugins/cleanupIDs: renamed from removeUnusedIDs; minify used IDs (fix [#7](https://github.com/svg/svgo/issues/7))
+* lib/svgo/js2svg: restore HTML entities back (fix [#80](https://github.com/svg/svgo/issues/80) + [#81](https://github.com/svg/svgo/issues/81))
+* plugins/removeDoctype: do not remove if custom XML entities presents (fix [#77](https://github.com/svg/svgo/issues/77))
+* lib/svgo/coa: refactoring, colors and fix [#70](https://github.com/svg/svgo/issues/70)
+* lib/svgo: store elapsed time in result object
+* usage examples with SVGZ (close [#18](https://github.com/svg/svgo/issues/18))
+* more optimized logo
+* update `.gitignore`
+
+### [ [>](https://github.com/svg/svgo/tree/v0.1.8) ] 0.1.8 / 11.12.2012
+* new plugin [plugins/removeUselessStrokeAndFill](https://github.com/svg/svgo/blob/master/plugins/removeUselessStrokeAndFill.js) (close [#75](https://github.com/svg/svgo/issues/75))
+* new plugin [plugins/removeUnusedIDs](https://github.com/svg/svgo/blob/master/plugins/removeUnusedIDs.js) (close [#76](https://github.com/svg/svgo/issues/76))
+* plugins/convertPathData: wrong M interpretation in some cases (fix [#73](https://github.com/svg/svgo/issues/73))
+* plugins/cleanupAttrs: use `isElem()` API
+* `.travis.yml`: check all branches
+
+
+### [ [>](https://github.com/svg/svgo/tree/v0.1.7) ] 0.1.7 / 08.12.2012
+* plugins/convertPathData: incorrect interpretation of `z + m` (fix [#69](https://github.com/svg/svgo/issues/69))
+* plugins/convertTransform: do a more accurate floating numbers rounding in `matrixToTransform()` (fix [#68](https://github.com/svg/svgo/issues/68))
+
+### [ [>](https://github.com/svg/svgo/tree/v0.1.6) ] 0.1.6 / 07.12.2012
+* plugins/convertPathData: collapse repeated instructions only after curveSmoothShorthands (fix [#64](https://github.com/svg/svgo/issues/64))
+* lib/svgo/coa: handle 'there is nothing to optimize' case and display a message about it (fix [#61](https://github.com/svg/svgo/issues/61))
+* plugins/cleanupSVGElem: delete as useless artefact
+
+
+### [ [>](https://github.com/svg/svgo/tree/v0.1.5) ] 0.1.5 / 06.12.2012
+* E-notated numbers in paths not recognised (fix [#63](https://github.com/svg/svgo/issues/63))
+* update README with `svgo-grunt` and `svgo-osx-folder-action`
+* fix `mocha-as-promised` plug in node 0.6
+
+### [ [>](https://github.com/svg/svgo/tree/v0.1.4) ] 0.1.4 / 05.12.2012
+* plugins/_collections: more defaults
+* `README.ru.md`
+* `docs/how-it-works/ru.md`
+* mocha + mocha-as-promised + chai + chai-as-promised + should + istanbul = <3
+* update dependencies semvers in `package.json`
+* `v0.1.x` and `v0.2.x` milestones
+
+### [ [>](https://github.com/svg/svgo/tree/v0.1.3) ] 0.1.3 / 30.11.2012
+* new plugin [plugins/cleanupNumericValues](https://github.com/svg/svgo/blob/master/plugins/cleanupNumericValues.js) (close [#8](https://github.com/svg/svgo/issues/8))
+* plugins/removeDefaultPx functionality now included in plugins/removeUnknownsAndDefaults
+* plugins/removeUnknownsAndDefaults: refactoring and picking up the complete elems+attrs collection (close [#59](https://github.com/svg/svgo/issues/59))
+* plugins/convertTransform: error in matrices multiplication (fix [#58](https://github.com/svg/svgo/issues/58))
+* plugins/convertTransform: mark translate() and scale() as useless only with one param (fix [#57](https://github.com/svg/svgo/issues/57))
+* plugins/convertPathData: drastic speed improvement with huge Path data
+* plugins/convertPathData: fix the very first Mm with multiple points (fix [#56](https://github.com/svg/svgo/issues/56))
+* plugins/moveElemsAttrsToGroup: additional check for transform attr
+* brand-new project `logo.svg`
+* `.travis.yml`: build only master branch
+* global `'use strict'`
+* `.jshintignore`
+* README and CHANGELOG: minor corrections
+
+### [ [>](https://github.com/svg/svgo/tree/v0.1.2) ] 0.1.2 / 24.11.2012
+* lib/svgo/svg2js: correct 'onerror' failure (fix [#51](https://github.com/svg/svgo/issues/51))
+* config: disable sax-js position tracking by default (fix [#52](https://github.com/svg/svgo/issues/52))
+* lib/svgo: rename 'startBytes' to 'inBytes' and 'endBytes' to 'outBytes' (close [#53](https://github.com/svg/svgo/issues/53))
+* plugins/removeUnknownsAndDefaults: remove SVG id attr (close [#54](https://github.com/svg/svgo/issues/54))
+
+### [ [>](https://github.com/svg/svgo/tree/v0.1.1) ] 0.1.1 / 23.11.2012
+* plugins/moveElemsAttrsToGroup: fix inheitable only attrs array (fix [#47](https://github.com/svg/svgo/issues/47))
+* plugins/removeEmptyContainers: do not remove an empty 'svg' element (fix [#48](https://github.com/svg/svgo/issues/48))
+* plugins/removeDefaultPx: should also understand a floating-numbers too (fix [#49](https://github.com/svg/svgo/issues/49))
+* plugins/removeUnknownsAndDefaults: merge multiple groupDefaults attrs (close [#50](https://github.com/svg/svgo/issues/50))
+
+### [ [>](https://github.com/svg/svgo/tree/v0.1.0) ] 0.1.0 / 22.11.2012
+* new plugin [plugins/removeUnknownsAndDefaults](https://github.com/svg/svgo/blob/master/plugins/removeUnknownsAndDefaults.js) (close [#6](https://github.com/svg/svgo/issues/6))
+* plugins/convertPathData: convert straight curves into lines segments (close [#17](https://github.com/svg/svgo/issues/17)); remove an absolute coords conversions
+* plugins/convertPathData: convert quadratic Bézier curveto into smooth shorthand (close [#31](https://github.com/svg/svgo/issues/31))
+* plugins/convertPathData: convert curveto into smooth shorthand (close [#30](https://github.com/svg/svgo/issues/30))
+* lib/svgo: global API refactoring (close [#37](https://github.com/svg/svgo/issues/37))
+* lib/svgo: fatal and stupid error in stream chunks concatenation (fix [#40](https://github.com/svg/svgo/issues/40))
+* lib/coa: batch folder optimization (close [#29](https://github.com/svg/svgo/issues/29))
+* lib/coa: support arguments as aliases to `--input` and `--output` (close [#28](https://github.com/svg/svgo/issues/28))
+* project logo by [Egor Bolhshakov](http://xizzzy.ru/)
+* move modules to `./lib/svgo/`
+* rename and convert `config.json` to `.svgo.yml`
+* add [./docs/](https://github.com/svg/svgo/tree/master/docs)
+* plugins/convertPathData: don't remove first `M` even if it's `0,0`
+* plugins/convertPathData: stronger defense from infinite loop
+* plugins/moveElemsAttrsToGroup: should affect only inheritable attributes (fix [#46](https://github.com/svg/svgo/issues/46))*
+* plugins/removeComments: ignore comments which starts with '!' (close [#43](https://github.com/svg/svgo/issues/43))
+* config: `cleanupAttrs` should be before `convertStyleToAttrs` (fix [#44](https://github.com/svg/svgo/issues/44))*
+* lib/svgo/jsAPI: add `eachAttr()` optional context param
+* temporarily remove PhantomJS and `--test` (close [#38](https://github.com/svg/svgo/issues/38))
+* q@0.8.10 compatibility: 'end is deprecated, use done instead' fix
+* add [Istanbul](https://github.com/gotwarlost/istanbul) code coverage
+* update dependencies versions and gitignore
+* README: add TODO section with versions milestones
+* update README with License section
+* update LICENSE with russian translation
+* `.editorconfig`: 2 spaces for YAML
+
+### [ [>](https://github.com/svg/svgo/tree/v0.0.9) ] 0.0.9 / 29.10.2012
+* [plugins how-to](https://github.com/svg/svgo/tree/master/plugins#readme) (close [#27](https://github.com/svg/svgo/issues/27))
+* allow any plugin of any type to go in any order (close [#14](https://github.com/svg/svgo/issues/14))
+* allow to do a multiple optimizations with one init (close [#25](https://github.com/svg/svgo/issues/25))
+* plugins/convertPathData: global refactoring
+* plugins/convertPathData: do all the tricks with absolute coords too (fix [#22](https://github.com/svg/svgo/issues/22))
+* plugins/convertPathData: accumulation of rounding errors (fix [#23](https://github.com/svg/svgo/issues/23))
+* plugins/convertPathData: prevent an infinity loop on invalid path data (fix [#26](https://github.com/svg/svgo/issues/26))
+* plugins/convertPathData: do not remove very first M from the path data (fix [#24](https://github.com/svg/svgo/issues/24))
+* plugins/convertPathData: optimize path data in &lt;glyph&gt; and &lt;missing-glyph&gt; (close [#20](https://github.com/svg/svgo/issues/20))
+* plugins/convertTransform: add patternTransform attribute to the process (close [#15](https://github.com/svg/svgo/issues/15))
+* plugins/convertTransform: Firefox: removing extra space in front of negative number is alowed only in path data, but not in transform (fix [#12](https://github.com/svg/svgo/issues/12))
+* plugins/removeXMLProcInst: remove only 'xml' but not 'xml-stylesheet' (fix [#21](https://github.com/svg/svgo/issues/15))
+* plugins/collapseGroups: merge split-level transforms (fix [#13](https://github.com/svg/svgo/issues/13))
+* jsdoc corrections
+
+### [ [>](https://github.com/svg/svgo/tree/v0.0.8) ] 0.0.8 / 20.10.2012
+* new plugin [convertTransform](plugins/convertTransform.js) (close [#5](https://github.com/svg/svgo/issues/5))
+* new plugin [removeUnusedNS](plugins/removeUnusedNS.js)
+* plugins/convertPathData: remove useless segments
+* plugins/convertPathData: a lot of refactoring
+* plugins/convertPathData: round numbers before conditions because of exponential notation (fix [#3](https://github.com/svg/svgo/issues/3))
+* plugins/moveElemsAttrsToGroup: merge split-level transforms instead of replacing (fix [#10](https://github.com/svg/svgo/issues/10))
+* lib/svg2js: catch and output xml parser errors (fix [#4](https://github.com/svg/svgo/issues/4))
+* lib/coa: open file for writing only when we are ready (fix [#2](https://github.com/svg/svgo/issues/2))
+* lib/tools: node.extend module
+* lib/plugins: refactoring
+* lib/js2svg: refactoring
+* lib/jsAPI: simplification and refactoring
+* absolute urls in README
+* update .editorconfig
+* update .travis.yml with nodejs 0.9
+
+### [ [>](https://github.com/svg/svgo/tree/v0.0.7) ] 0.0.7 / 14.10.2012
+* new plugin [convertPathData](plugins/convertPathData.js)
+* --input data now can be a Data URI base64 string
+* --output data now can be a Data URI base64 string with --datauri flag
+* Travis CI
+* JSHint corrections + .jshintrc
+* [.editorconfig](http://editorconfig.org/)
+* display time spent on optimization
+* .svgo → config.json
+* lib/phantom_wrapper.js → lib/phantom.js
+
+### [ [>](https://github.com/svg/svgo/tree/v0.0.6) ] 0.0.6 / 04.10.2012
+* add --test option to make a visual comparison of two files (PhantomJS pre-required)
+* update README and CHANGELOG with the correct relative urls
+
+### [ [>](https://github.com/svg/svgo/tree/v0.0.5) ] 0.0.5 / 03.10.2012
+* every plugin now has [at least one test](plugins)
+* removeViewBox, cleanupEnableBackground, removeEditorsNSData, convertStyleToAttrs and collapseGroups plugins fixes
+* new --pretty option for the pretty printed SVG
+* lib/config refactoring
+
+### [ [>](https://github.com/svg/svgo/tree/v0.0.4) ] 0.0.4 / 30.09.2012
+* new plugin [removeViewBox](plugins/removeViewBox.js)
+* new plugin [cleanupEnableBackground](plugins/cleanupEnableBackground.js)
+* display useful info after successful optimization
+* 'npm test' with 'spec' mocha output by default
+
+### [ [>](https://github.com/svg/svgo/tree/v0.0.3) ] 0.0.3 / 29.09.2012
+* plugins/collapseGroups bugfix
+* plugins/moveElemsAttrsToGroup bugfix
+* svgo now display --help if running w/o arguments
+* massive jsdoc updates
+* plugins engine main filter function optimization
+
+### [ [>](https://github.com/svg/svgo/tree/v0.0.2) ] 0.0.2 / 28.09.2012
+* add --disable and --enable command line options
+* add an empty values rejecting to coa.js
+* update README
+
+### [ [>](https://github.com/svg/svgo/tree/v0.0.1) ] 0.0.1 / 27.09.2012
+* initial public version
diff --git a/node_modules/svgo/LICENSE b/node_modules/svgo/LICENSE
new file mode 100644
index 00000000..cd8d5003
--- /dev/null
+++ b/node_modules/svgo/LICENSE
@@ -0,0 +1,55 @@
+The MIT License
+
+Copyright © 2012–2016 Kir Belevich
+
+Permission is hereby granted, free of charge, to any person
+obtaining a copy of this software and associated documentation
+files (the "Software"), to deal in the Software without
+restriction, including without limitation the rights to use,
+copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+Лицензия MIT
+
+Copyright © 2012–2016 Кир Белевич
+
+Данная лицензия разрешает лицам, получившим копию данного
+программного обеспечения и сопутствующей документации
+(в дальнейшем именуемыми «Программное Обеспечение»), безвозмездно
+использовать Программное Обеспечение без ограничений, включая
+неограниченное право на использование, копирование, изменение,
+добавление, публикацию, распространение, сублицензирование
+и/или продажу копий Программного Обеспечения, также как и лицам,
+которым предоставляется данное Программное Обеспечение,
+при соблюдении следующих условий:
+
+Указанное выше уведомление об авторском праве и данные условия
+должны быть включены во все копии или значимые части данного
+Программного Обеспечения.
+
+ДАННОЕ ПРОГРАММНОЕ ОБЕСПЕЧЕНИЕ ПРЕДОСТАВЛЯЕТСЯ «КАК ЕСТЬ»,
+БЕЗ КАКИХ-ЛИБО ГАРАНТИЙ, ЯВНО ВЫРАЖЕННЫХ ИЛИ ПОДРАЗУМЕВАЕМЫХ,
+ВКЛЮЧАЯ, НО НЕ ОГРАНИЧИВАЯСЬ ГАРАНТИЯМИ ТОВАРНОЙ ПРИГОДНОСТИ,
+СООТВЕТСТВИЯ ПО ЕГО КОНКРЕТНОМУ НАЗНАЧЕНИЮ И ОТСУТСТВИЯ НАРУШЕНИЙ
+ПРАВ. НИ В КАКОМ СЛУЧАЕ АВТОРЫ ИЛИ ПРАВООБЛАДАТЕЛИ НЕ НЕСУТ
+ОТВЕТСТВЕННОСТИ ПО ИСКАМ О ВОЗМЕЩЕНИИ УЩЕРБА, УБЫТКОВ ИЛИ ДРУГИХ
+ТРЕБОВАНИЙ ПО ДЕЙСТВУЮЩИМ КОНТРАКТАМ, ДЕЛИКТАМ ИЛИ ИНОМУ,
+ВОЗНИКШИМ ИЗ, ИМЕЮЩИМ ПРИЧИНОЙ ИЛИ СВЯЗАННЫМ С ПРОГРАММНЫМ
+ОБЕСПЕЧЕНИЕМ ИЛИ ИСПОЛЬЗОВАНИЕМ ПРОГРАММНОГО ОБЕСПЕЧЕНИЯ
+ИЛИ ИНЫМИ ДЕЙСТВИЯМИ С ПРОГРАММНЫМ ОБЕСПЕЧЕНИЕМ.
diff --git a/node_modules/svgo/Makefile b/node_modules/svgo/Makefile
new file mode 100644
index 00000000..c11daab9
--- /dev/null
+++ b/node_modules/svgo/Makefile
@@ -0,0 +1,21 @@
+test:
+	@npm run test
+
+lib-cov:
+	@./node_modules/.bin/istanbul instrument --output lib-cov --no-compact --variable global.__coverage__ lib
+
+coverage: lib-cov
+	@COVERAGE=1 ISTANBUL_REPORTERS=text-summary ./node_modules/.bin/mocha --reporter mocha-istanbul
+	@rm -rf lib-cov
+
+coveralls: lib-cov
+	@COVERAGE=1 ISTANBUL_REPORTERS=lcovonly ./node_modules/.bin/mocha --reporter mocha-istanbul
+	@cat lcov.info | ./node_modules/.bin/coveralls
+	@rm -rf lib-cov lcov.info
+
+travis: jshint test coveralls
+
+jshint:
+	@npm run jshint
+
+.PHONY: test
diff --git a/node_modules/svgo/README.md b/node_modules/svgo/README.md
new file mode 100644
index 00000000..c77c6812
--- /dev/null
+++ b/node_modules/svgo/README.md
@@ -0,0 +1,155 @@
+**english** | [русский](https://github.com/svg/svgo/blob/master/README.ru.md)
+- - -
+
+<img src="https://svg.github.io/svgo-logo.svg" width="200" height="200" alt="logo"/>
+
+## SVGO [![NPM version](https://badge.fury.io/js/svgo.svg)](https://npmjs.org/package/svgo) [![Dependency Status](https://gemnasium.com/svg/svgo.svg)](https://gemnasium.com/svg/svgo) [![Build Status](https://secure.travis-ci.org/svg/svgo.svg)](https://travis-ci.org/svg/svgo) [![Coverage Status](https://img.shields.io/coveralls/svg/svgo.svg)](https://coveralls.io/r/svg/svgo?branch=master)
+
+**SVG O**ptimizer is a Nodejs-based tool for optimizing SVG vector graphics files.
+![](https://mc.yandex.ru/watch/18431326)
+
+## Why?
+
+SVG files, especially exported from various editors, usually contain a lot of redundant and useless information such as editor metadata, comments, hidden elements, default or non-optimal values and other stuff that can be safely removed or converted without affecting SVG rendering result.
+
+## What it can do
+
+SVGO has a plugin-based architecture, so almost every optimization is a separate plugin.
+
+Today we have:
+
+| Plugin | Description |
+| ------ | ----------- | 
+| [cleanupAttrs](https://github.com/svg/svgo/blob/master/plugins/cleanupAttrs.js) | cleanup attributes from newlines, trailing, and repeating spaces |
+| [removeDoctype](https://github.com/svg/svgo/blob/master/plugins/removeDoctype.js) | remove doctype declaration |
+| [removeXMLProcInst](https://github.com/svg/svgo/blob/master/plugins/removeXMLProcInst.js) | remove XML processing instructions |
+| [removeComments](https://github.com/svg/svgo/blob/master/plugins/removeComments.js) | remove comments |
+| [removeMetadata](https://github.com/svg/svgo/blob/master/plugins/removeMetadata.js) | remove `<metadata>` |
+| [removeTitle](https://github.com/svg/svgo/blob/master/plugins/removeTitle.js) | remove `<title>` (disabled by default) |
+| [removeDesc](https://github.com/svg/svgo/blob/master/plugins/removeDesc.js) | remove `<desc>` (only non-meaningful by default) |
+| [removeUselessDefs](https://github.com/svg/svgo/blob/master/plugins/removeUselessDefs.js) | remove elements of `<defs>` without `id` |
+| [removeXMLNS](https://github.com/svg/svgo/blob/master/plugins/removeXMLNS.js) | removes `xmlns` attribute (for inline svg, disabled by default) |
+| [removeEditorsNSData](https://github.com/svg/svgo/blob/master/plugins/removeEditorsNSData.js) | remove editors namespaces, elements, and attributes |
+| [removeEmptyAttrs](https://github.com/svg/svgo/blob/master/plugins/removeEmptyAttrs.js) | remove empty attributes |
+| [removeHiddenElems](https://github.com/svg/svgo/blob/master/plugins/removeHiddenElems.js) | remove hidden elements |
+| [removeEmptyText](https://github.com/svg/svgo/blob/master/plugins/removeEmptyText.js) | remove empty Text elements |
+| [removeEmptyContainers](https://github.com/svg/svgo/blob/master/plugins/removeEmptyContainers.js) | remove empty Container elements |
+| [removeViewBox](https://github.com/svg/svgo/blob/master/plugins/removeViewBox.js) | remove `viewBox` attribute when possible (disabled by default) |
+| [cleanupEnableBackground](https://github.com/svg/svgo/blob/master/plugins/cleanupEnableBackground.js) | remove or cleanup `enable-background` attribute when possible |
+| [minifyStyles](https://github.com/svg/svgo/blob/master/plugins/minifyStyles.js) | minify `<style>` elements content with [CSSO](https://github.com/css/csso) |
+| [convertStyleToAttrs](https://github.com/svg/svgo/blob/master/plugins/convertStyleToAttrs.js) | convert styles into attributes |
+| [convertColors](https://github.com/svg/svgo/blob/master/plugins/convertColors.js) | convert colors (from `rgb()` to `#rrggbb`, from `#rrggbb` to `#rgb`) |
+| [convertPathData](https://github.com/svg/svgo/blob/master/plugins/convertPathData.js) | convert Path data to relative or absolute (whichever is shorter), convert one segment to another, trim useless delimiters, smart rounding, and much more |
+| [convertTransform](https://github.com/svg/svgo/blob/master/plugins/convertTransform.js) | collapse multiple transforms into one, convert matrices to the short aliases, and much more |
+| [removeUnknownsAndDefaults](https://github.com/svg/svgo/blob/master/plugins/removeUnknownsAndDefaults.js) | remove unknown elements content and attributes, remove attrs with default values |
+| [removeNonInheritableGroupAttrs](https://github.com/svg/svgo/blob/master/plugins/removeNonInheritableGroupAttrs.js) | remove non-inheritable group's "presentation" attributes |
+| [removeUselessStrokeAndFill](https://github.com/svg/svgo/blob/master/plugins/removeUselessStrokeAndFill.js) | remove useless `stroke` and `fill` attrs |
+| [removeUnusedNS](https://github.com/svg/svgo/blob/master/plugins/removeUnusedNS.js) | remove unused namespaces declaration |
+| [cleanupIDs](https://github.com/svg/svgo/blob/master/plugins/cleanupIDs.js) | remove unused and minify used IDs |
+| [cleanupNumericValues](https://github.com/svg/svgo/blob/master/plugins/cleanupNumericValues.js) | round numeric values to the fixed precision, remove default `px` units |
+| [cleanupListOfValues](https://github.com/svg/svgo/blob/master/plugins/cleanupListOfValues.js) | round numeric values in attributes that take a list of numbers (like `viewBox` or `enableBackground`) |
+| [moveElemsAttrsToGroup](https://github.com/svg/svgo/blob/master/plugins/moveElemsAttrsToGroup.js) | move elements' attributes to their enclosing group |
+| [moveGroupAttrsToElems](https://github.com/svg/svgo/blob/master/plugins/moveGroupAttrsToElems.js) | move some group attributes to the contained elements |
+| [collapseGroups](https://github.com/svg/svgo/blob/master/plugins/collapseGroups.js) | collapse useless groups |
+| [removeRasterImages](https://github.com/svg/svgo/blob/master/plugins/removeRasterImages.js) | remove raster images (disabled by default) |
+| [mergePaths](https://github.com/svg/svgo/blob/master/plugins/mergePaths.js) | merge multiple Paths into one |
+| [convertShapeToPath](https://github.com/svg/svgo/blob/master/plugins/convertShapeToPath.js) | convert some basic shapes to `<path>` |
+| [sortAttrs](https://github.com/svg/svgo/blob/master/plugins/sortAttrs.js) | sort element attributes for epic readability (disabled by default) |
+| [transformsWithOnePath](https://github.com/svg/svgo/blob/master/plugins/transformsWithOnePath.js) | apply transforms, crop by real width, center vertical alignment, and resize SVG with one Path inside (disabled by default) |
+| [removeDimensions](https://github.com/svg/svgo/blob/master/plugins/removeDimensions.js) | remove `width`/`height` attributes if `viewBox` is present (disabled by default) |
+| [removeAttrs](https://github.com/svg/svgo/blob/master/plugins/removeAttrs.js) | remove attributes by pattern (disabled by default) |
+| [removeElementsByAttr](https://github.com/svg/svgo/blob/master/plugins/removeElementsByAttr.js) | remove arbitrary elements by ID or className (disabled by default) |
+| [addClassesToSVGElement](https://github.com/svg/svgo/blob/master/plugins/addClassesToSVGElement.js) | add classnames to an outer `<svg>` element (disabled by default) |
+| [addAttributesToSVGElement](https://github.com/svg/svgo/blob/master/plugins/addAttributesToSVGElement.js) | adds attributes to an outer `<svg>` element (disabled by default) |
+| [removeStyleElement](https://github.com/svg/svgo/blob/master/plugins/removeStyleElement.js) | remove `<style>` elements (disabled by default) |
+
+Want to know how it works and how to write your own plugin? [Of course you want to](https://github.com/svg/svgo/blob/master/docs/how-it-works/en.md). ([동작방법](https://github.com/svg/svgo/blob/master/docs/how-it-works/ko.md))
+
+
+## How to use
+
+```sh
+$ [sudo] npm install -g svgo
+```
+
+```
+Usage:
+  svgo [OPTIONS] [ARGS]
+
+Options:
+  -h, --help : Help
+  -v, --version : Version
+  -i INPUT, --input=INPUT : Input file, "-" for STDIN
+  -s STRING, --string=STRING : Input SVG data string
+  -f FOLDER, --folder=FOLDER : Input folder, optimize and rewrite all *.svg files
+  -o OUTPUT, --output=OUTPUT : Output file or folder (by default the same as the input), "-" for STDOUT
+  -p PRECISION, --precision=PRECISION : Set number of digits in the fractional part, overrides plugins params
+  --config=CONFIG : Config file or JSON string to extend or replace default
+  --disable=DISABLE : Disable plugin by name
+  --enable=ENABLE : Enable plugin by name
+  --datauri=DATAURI : Output as Data URI string (base64, URI encoded or unencoded)
+  --multipass : Enable multipass
+  --pretty : Make SVG pretty printed
+  --indent=INDENT : Indent number when pretty printing SVGs
+  -q, --quiet : Only output error messages, not regular status messages
+  --show-plugins : Show available plugins and exit
+
+Arguments:
+  INPUT : Alias to --input
+  OUTPUT : Alias to --output
+```
+
+* with files:
+
+        $ svgo test.svg
+
+    or:
+
+        $ svgo test.svg test.min.svg
+
+* with STDIN / STDOUT:
+
+        $ cat test.svg | svgo -i - -o - > test.min.svg
+
+* with folder
+
+        $ svgo -f ../path/to/folder/with/svg/files
+
+    or:
+
+        $ svgo -f ../path/to/folder/with/svg/files -o ../path/to/folder/with/svg/output
+
+* with strings:
+
+        $ svgo -s '<svg version="1.1">test</svg>' -o test.min.svg
+
+    or even with Data URI base64:
+
+        $ svgo -s 'data:image/svg+xml;base64,…' -o test.min.svg
+
+* with SVGZ:
+
+    from `.svgz` to `.svg`:
+
+        $ gunzip -c test.svgz | svgo -i - -o test.min.svg
+
+    from `.svg` to `.svgz`:
+
+        $ svgo test.svg -o - | gzip -cfq9 > test.svgz
+
+* with GUI – [svgo-gui](https://github.com/svg/svgo-gui)
+* as a web app - [SVGOMG](https://jakearchibald.github.io/svgomg/)
+* as a Nodejs module – [examples](https://github.com/svg/svgo/tree/master/examples)
+* as a Grunt task – [grunt-svgmin](https://github.com/sindresorhus/grunt-svgmin)
+* as a Gulp task – [gulp-svgmin](https://github.com/ben-eb/gulp-svgmin)
+* as a Mimosa module – [mimosa-minify-svg](https://github.com/dbashford/mimosa-minify-svg)
+* as an OSX Folder Action – [svgo-osx-folder-action](https://github.com/svg/svgo-osx-folder-action)
+* as a webpack loader – [image-webpack-loader](https://github.com/tcoopman/image-webpack-loader)
+* as a Telegram Bot – [svgo_bot](https://github.com/maksugr/svgo_bot)
+* as a PostCSS plugin - [postcss-svgo](https://github.com/ben-eb/postcss-svgo)
+
+## License and copyrights
+
+This software is released under the terms of the [MIT license](https://github.com/svg/svgo/blob/master/LICENSE).
+
+Logo by [Yegor Bolshakov](http://xizzzy.ru/).
diff --git a/node_modules/svgo/README.ru.md b/node_modules/svgo/README.ru.md
new file mode 100644
index 00000000..ef236f38
--- /dev/null
+++ b/node_modules/svgo/README.ru.md
@@ -0,0 +1,155 @@
+[english](https://github.com/svg/svgo/blob/master/README.md) | **русский**
+- - -
+
+<img src="https://svg.github.io/svgo-logo.svg" width="200" height="200" alt="logo"/>
+
+## SVGO [![NPM version](https://badge.fury.io/js/svgo.svg)](https://npmjs.org/package/svgo) [![Dependency Status](https://gemnasium.com/svg/svgo.svg)](https://gemnasium.com/svg/svgo) [![Build Status](https://secure.travis-ci.org/svg/svgo.svg)](https://travis-ci.org/svg/svgo) [![Coverage Status](https://img.shields.io/coveralls/svg/svgo.svg)](https://coveralls.io/r/svg/svgo?branch=master)
+
+**SVG** **O**ptimizer – это инструмент для оптимизации векторной графики в формате SVG, написанный на Node.js.
+![](https://mc.yandex.ru/watch/18431326)
+
+## Зачем?
+
+SVG-файлы, особенно – экспортированные из различных редакторов, содержат много избыточной и бесполезной информации, комментариев, скрытых элементов, неоптимальные или стандартные значения и другой мусор, удаление которого безопасно и не влияет на конечный результат отрисовки.
+
+## Возможности
+
+SVGO имеет расширяемую архитектуру, в которой почти каждая оптимизация является отдельным расширением.
+
+Сегодня у нас есть:
+
+| Plugin | Description |
+| ------ | ----------- | 
+| [cleanupAttrs](https://github.com/svg/svgo/blob/master/plugins/cleanupAttrs.js) | удаление переносов строк и лишних пробелов |
+| [removeDoctype](https://github.com/svg/svgo/blob/master/plugins/removeDoctype.js) | удаление doctype |
+| [removeXMLProcInst](https://github.com/svg/svgo/blob/master/plugins/removeXMLProcInst.js) | удаление XML-инструкций |
+| [removeComments](https://github.com/svg/svgo/blob/master/plugins/removeComments.js) | удаление комментариев |
+| [removeMetadata](https://github.com/svg/svgo/blob/master/plugins/removeMetadata.js) | удаление `<metadata>` |
+| [removeTitle](https://github.com/svg/svgo/blob/master/plugins/removeTitle.js) | удаление `<title>` (выключено по умолчанию) |
+| [removeDesc](https://github.com/svg/svgo/blob/master/plugins/removeDesc.js) | удаление `<desc>` (по умолчанию только незначимых) |
+| [removeUselessDefs](https://github.com/svg/svgo/blob/master/plugins/removeUselessDefs.js) | удаление элементов в `<defs>` без `id` |
+| [removeXMLNS](https://github.com/svg/svgo/blob/master/plugins/removeXMLNS.js) | удаление атрибута xmlns (для заинлайненных svg, выключено по умолчанию) |
+| [removeEditorsNSData](https://github.com/svg/svgo/blob/master/plugins/removeEditorsNSData.js) | удаление пространств имён различных редакторов, их элементов и атрибутов |
+| [removeEmptyAttrs](https://github.com/svg/svgo/blob/master/plugins/removeEmptyAttrs.js) | удаление пустых атрибутов |
+| [removeHiddenElems](https://github.com/svg/svgo/blob/master/plugins/removeHiddenElems.js) | удаление скрытых элементов |
+| [removeEmptyText](https://github.com/svg/svgo/blob/master/plugins/removeEmptyText.js) | удаление пустых текстовых элементов |
+| [removeEmptyContainers](https://github.com/svg/svgo/blob/master/plugins/removeEmptyContainers.js) | удаление пустых элементов-контейнеров |
+| [removeViewBox](https://github.com/svg/svgo/blob/master/plugins/removeViewBox.js) | удаление атрибута `viewBox`, когда это возможно |
+| [cleanupEnableBackground](https://github.com/svg/svgo/blob/master/plugins/cleanupEnableBackground.js) | удаление или оптимизация атрибута `enable-background`, когда это возможно |
+| [minifyStyles](https://github.com/svg/svgo/blob/master/plugins/minifyStyles.js) | уменьшает содержимое элементов `<style>` с помощью [CSSO](https://github.com/css/csso). |
+| [convertStyleToAttrs](https://github.com/svg/svgo/blob/master/plugins/convertStyleToAttrs.js) | конвертирование стилей в атрибуте `style` в отдельные svg-атрибуты |
+| [convertColors](https://github.com/svg/svgo/blob/master/plugins/convertColors.js) | конвертирование цветовых значений: из `rgb()` в `#rrggbb`, из `#rrggbb` в `#rgb` |
+| [convertPathData](https://github.com/svg/svgo/blob/master/plugins/convertPathData.js) | конвертирование данных Path в относительные или абсолютные координаты, смотря что  |короче; конвертирование одних типов сегментов в другие; удаление ненужных разделителей; умное округление и тому подобное
+| [convertTransform](https://github.com/svg/svgo/blob/master/plugins/convertTransform.js) | схлопывание нескольких трансформаций в одну, конвертирование матриц в короткие алиасы  |и многое другое
+| [removeUnknownsAndDefaults](https://github.com/svg/svgo/blob/master/plugins/removeUnknownsAndDefaults.js) | удаление неизвестных элементов, контента и атрибутов |
+| [removeNonInheritableGroupAttrs](https://github.com/svg/svgo/blob/master/plugins/removeNonInheritableGroupAttrs.js) | удаление ненаследуемых "презентационных" атрибутов групп |
+| [removeUselessStrokeAndFill](https://github.com/svg/svgo/blob/master/plugins/removeUselessStrokeAndFill.js) | удаление неиспользуемых атрибутов stroke-* и fill-* |
+| [removeUnusedNS](https://github.com/svg/svgo/blob/master/plugins/removeUnusedNS.js) | удаление  деклараций неиспользуемых пространств имён |
+| [cleanupIDs](https://github.com/svg/svgo/blob/master/plugins/cleanupIDs.js) | удаление неиспользуемых и сокращение используемых ID |
+| [cleanupNumericValues](https://github.com/svg/svgo/blob/master/plugins/cleanupNumericValues.js) | округление дробных чисел до заданной точности, удаление `px` как единицы  |измерения по-умолчанию
+| [cleanupListOfValues](https://github.com/svg/svgo/blob/master/plugins/cleanupListOfValues.js) | округление числовых значений в атрибутах со списком чисел, таких как `viewBox`  |или `enableBackground`
+| [moveElemsAttrsToGroup](https://github.com/svg/svgo/blob/master/plugins/moveElemsAttrsToGroup.js) | перемещение совпадающих атрибутов у всех элементов внутри группы `<g>` |
+| [moveGroupAttrsToElems](https://github.com/svg/svgo/blob/master/plugins/moveGroupAttrsToElems.js) | перемещение некоторых атрибутов группы на элементы внутри |
+| [collapseGroups](https://github.com/svg/svgo/blob/master/plugins/collapseGroups.js) | схлопывание бесполезных групп `<g>` |
+| [removeRasterImage](https://github.com/svg/svgo/blob/master/plugins/removeRasterImages.js) | удаление растровых изображений (выключено по умолчанию) |
+| [mergePaths](https://github.com/svg/svgo/blob/master/plugins/mergePaths.js) | склеивание нескольких Path в одну кривую |
+| [convertShapeToPath](https://github.com/svg/svgo/blob/master/plugins/convertShapeToPath.js) | конвертирование простых форм в Path |
+| [sortAttrs](https://github.com/svg/svgo/blob/master/plugins/sortAttrs.js) | сортировка атрибутов элементов для удобочитаемости (выключено по умолчанию) |
+| [transformsWithOnePath](https://github.com/svg/svgo/blob/master/plugins/transformsWithOnePath.js) | применение трансформаций, обрезка по реальной ширине, вертикальное  |выравнивание по центру и изменение размеров SVG с одним Path внутри
+| [removeDimensions](https://github.com/svg/svgo/blob/master/plugins/removeDimensions.js) | удаляет атрибуты width/height при наличии viewBox (выключено по умолчанию) |
+| [removeAttrs](https://github.com/svg/svgo/blob/master/plugins/removeAttrs.js) | удаляет атрибуты по указанному паттерну (выключено по умолчанию) |
+| [removeElementsByAttr](https://github.com/svg/svgo/blob/master/plugins/removeElementsByAttr.js) | удаляет элементы по указанным ID или классам (выключено по умолчанию) |
+| [addClassesToSVGElement](https://github.com/svg/svgo/blob/master/plugins/addClassesToSVGElement.js) | добавляет имена классов корневому элементу `<svg>` (выключено по умолчанию) |
+| [addAttributesToSVGElement](https://github.com/svg/svgo/blob/master/plugins/addAttributesToSVGElement.js) | добавляет атрибуты корневому элементу `<svg>` (выключено  |по умолчанию)
+| [removeStyleElement](https://github.com/svg/svgo/blob/master/plugins/removeStyleElement.js) | удаляет элементы `<style>` (выключено по умолчанию) |
+
+Хотите узнать, как это работает и как написать свой плагин? [Конечно же, да!](https://github.com/svg/svgo/blob/master/docs/how-it-works/ru.md).
+
+
+## Как использовать
+
+```sh
+$ [sudo] npm install -g svgo
+```
+
+```
+Выполнение:
+  svgo [OPTIONS] [ARGS]
+
+Параметры:
+  -h, --help : Помощь
+  -v, --version : Версия программы
+  -i INPUT, --input=INPUT : Входной файл, "-" для STDIN
+  -s STRING, --string=STRING : Входная строка SVG
+  -f FOLDER, --folder=FOLDER : Входная папка, оптимизирует и перезаписывает все файлы *.svg
+  -o OUTPUT, --output=OUTPUT : Выходной файл или папка (совпадает с входным по умолчанию), "-" для STDOUT
+  -p PRECISION, --precision=PRECISION : Число цифр после запятой, переопределяет параметры плагинов
+  --config=CONFIG : Файл конфигурации (или строка JSON) для расширения и замены настроек
+  --disable=DISABLE : Выключение плагина по имени
+  --enable=ENABLE : Включение плагина по имени
+  --datauri=DATAURI : Результат в виде строки Data URI (base64, URI encoded или unencoded)
+  --multipass : Оптимизация в несколько проходов
+  --pretty : Удобочитаемое форматирование SVG
+  --indent=INDENT : Размер отступа для удобочитаемого форматирования
+  -q, --quiet : Подавляет вывод информации, выводятся только сообщения об ошибках
+  --show-plugins : Доступные плагины
+
+Аргументы:
+  INPUT : Аналогично --input
+  OUTPUT : Аналогично --output
+```
+
+* с файлами:
+
+        $ svgo test.svg
+
+    или:
+
+        $ svgo test.svg test.min.svg
+
+* со STDIN / STDOUT:
+
+        $ cat test.svg | svgo -i - -o - > test.min.svg
+
+* с папками
+
+        $ svgo -f ../path/to/folder/with/svg/files
+
+    или:
+
+        $ svgo -f ../path/to/folder/with/svg/files -o ../path/to/folder/with/svg/output
+
+* со строками:
+
+        $ svgo -s '<svg version="1.1">test</svg>' -o test.min.svg
+
+    или даже с Data URI base64:
+
+        $ svgo -s 'data:image/svg+xml;base64,…' -o test.min.svg
+
+* с SVGZ:
+
+    из `.svgz` в `.svg`:
+
+        $ gunzip -c test.svgz | svgo -i - -o test.min.svg
+
+    из `.svg` в `.svgz`:
+
+        $ svgo test.svg -o - | gzip -cfq9 > test.svgz
+
+* с помощью GUI – [svgo-gui](https://github.com/svg/svgo-gui)
+* в виде веб-приложения - [SVGOMG](https://jakearchibald.github.io/svgomg/)
+* как модуль Node.js – [examples](https://github.com/svg/svgo/tree/master/examples)
+* как таск для Grunt – [grunt-svgmin](https://github.com/sindresorhus/grunt-svgmin)
+* как таск для Gulp – [gulp-svgmin](https://github.com/ben-eb/gulp-svgmin)
+* как таск для Mimosa – [mimosa-minify-svg](https://github.com/dbashford/mimosa-minify-svg)
+* как действие папки в OSX – [svgo-osx-folder-action](https://github.com/svg/svgo-osx-folder-action)
+* через загрузчик в webpack – [image-webpack-loader](https://github.com/tcoopman/image-webpack-loader)
+* с помощью бота в Telegram – [svgo_bot](https://github.com/maksugr/svgo_bot)
+* как плагин PostCSS - [postcss-svgo](https://github.com/ben-eb/postcss-svgo)
+
+## Лицензия и копирайты
+
+Данное программное обеспечение выпускается под [лицензией MIT](https://github.com/svg/svgo/blob/master/LICENSE).
+
+Логотип – [Егор Большаков](http://xizzzy.ru/).
diff --git a/node_modules/svgo/bin/svgo b/node_modules/svgo/bin/svgo
new file mode 100755
index 00000000..2fd77c02
--- /dev/null
+++ b/node_modules/svgo/bin/svgo
@@ -0,0 +1,3 @@
+#!/usr/bin/env node
+
+require('../lib/svgo/coa').run();
diff --git a/node_modules/svgo/lib/svgo.js b/node_modules/svgo/lib/svgo.js
new file mode 100644
index 00000000..c593023f
--- /dev/null
+++ b/node_modules/svgo/lib/svgo.js
@@ -0,0 +1,80 @@
+'use strict';
+
+/**
+ * SVGO is a Nodejs-based tool for optimizing SVG vector graphics files.
+ *
+ * @see https://github.com/svg/svgo
+ *
+ * @author Kir Belevich <kir@soulshine.in> (https://github.com/deepsweet)
+ * @copyright © 2012 Kir Belevich
+ * @license MIT https://raw.githubusercontent.com/svg/svgo/master/LICENSE
+ */
+
+var CONFIG = require('./svgo/config.js'),
+    SVG2JS = require('./svgo/svg2js.js'),
+    PLUGINS = require('./svgo/plugins.js'),
+    JSAPI = require('./svgo/jsAPI.js'),
+    JS2SVG = require('./svgo/js2svg.js');
+
+var SVGO = module.exports = function(config) {
+
+    this.config = CONFIG(config);
+
+};
+
+SVGO.prototype.optimize = function(svgstr, callback) {
+    if (this.config.error) return callback(this.config);
+
+    var _this = this,
+        config = this.config,
+        maxPassCount = config.multipass ? 10 : 1,
+        counter = 0,
+        prevResultSize = Number.POSITIVE_INFINITY,
+        optimizeOnceCallback = function(svgjs) {
+
+            if (svgjs.error) {
+                callback(svgjs);
+                return;
+            }
+
+            if (++counter < maxPassCount && svgjs.data.length < prevResultSize) {
+                prevResultSize = svgjs.data.length;
+                _this._optimizeOnce(svgjs.data, optimizeOnceCallback);
+            } else {
+                callback(svgjs);
+            }
+
+        };
+
+    _this._optimizeOnce(svgstr, optimizeOnceCallback);
+
+};
+
+SVGO.prototype._optimizeOnce = function(svgstr, callback) {
+    var config = this.config;
+
+    SVG2JS(svgstr, function(svgjs) {
+
+        if (svgjs.error) {
+            callback(svgjs);
+            return;
+        }
+
+        svgjs = PLUGINS(svgjs, config.plugins);
+
+        callback(JS2SVG(svgjs, config.js2svg));
+
+    });
+};
+
+/**
+ * The factory that creates a content item with the helper methods.
+ *
+ * @param {Object} data which passed to jsAPI constructor
+ * @returns {JSAPI} content item
+ */
+SVGO.prototype.createContentItem = function(data) {
+
+    return new JSAPI(data);
+
+};
diff --git a/node_modules/svgo/lib/svgo/coa.js b/node_modules/svgo/lib/svgo/coa.js
new file mode 100644
index 00000000..6b482231
--- /dev/null
+++ b/node_modules/svgo/lib/svgo/coa.js
@@ -0,0 +1,581 @@
+/* jshint quotmark: false */
+'use strict';
+
+require('colors');
+
+var FS = require('fs'),
+    PATH = require('path'),
+    SVGO = require('../svgo.js'),
+    YAML = require('js-yaml'),
+    PKG = require('../../package.json'),
+    mkdirp = require('mkdirp'),
+    encodeSVGDatauri = require('./tools.js').encodeSVGDatauri,
+    decodeSVGDatauri = require('./tools.js').decodeSVGDatauri,
+    regSVGFile = /\.svg$/;
+
+/**
+ * Command-Option-Argument.
+ *
+ * @see https://github.com/veged/coa
+ */
+module.exports = require('coa').Cmd()
+    .helpful()
+    .name(PKG.name)
+    .title(PKG.description)
+    .opt()
+        .name('version').title('Version')
+        .short('v').long('version')
+        .only()
+        .flag()
+        .act(function() {
+            // output the version to stdout instead of stderr if returned
+            process.stdout.write(PKG.version + '\n');
+            // coa will run `.toString` on the returned value and send it to stderr
+            return '';
+        })
+        .end()
+    .opt()
+        .name('input').title('Input file, "-" for STDIN')
+        .short('i').long('input')
+        .val(function(val) {
+            return val || this.reject("Option '--input' must have a value.");
+        })
+        .end()
+    .opt()
+        .name('string').title('Input SVG data string')
+        .short('s').long('string')
+        .end()
+    .opt()
+        .name('folder').title('Input folder, optimize and rewrite all *.svg files')
+        .short('f').long('folder')
+        .val(function(val) {
+            return val || this.reject("Option '--folder' must have a value.");
+        })
+        .end()
+    .opt()
+        .name('output').title('Output file or folder (by default the same as the input), "-" for STDOUT')
+        .short('o').long('output')
+        .val(function(val) {
+            return val || this.reject("Option '--output' must have a value.");
+        })
+        .end()
+    .opt()
+        .name('precision').title('Set number of digits in the fractional part, overrides plugins params')
+        .short('p').long('precision')
+        .val(function(val) {
+            return !isNaN(val) ? val : this.reject("Option '--precision' must be an integer number");
+        })
+        .end()
+    .opt()
+        .name('config').title('Config file or JSON string to extend or replace default')
+        .long('config')
+        .val(function(val) {
+            return val || this.reject("Option '--config' must have a value.");
+        })
+        .end()
+    .opt()
+        .name('disable').title('Disable plugin by name')
+        .long('disable')
+        .arr()
+        .val(function(val) {
+            return val || this.reject("Option '--disable' must have a value.");
+        })
+        .end()
+    .opt()
+        .name('enable').title('Enable plugin by name')
+        .long('enable')
+        .arr()
+        .val(function(val) {
+            return val || this.reject("Option '--enable' must have a value.");
+        })
+        .end()
+    .opt()
+        .name('datauri').title('Output as Data URI string (base64, URI encoded or unencoded)')
+        .long('datauri')
+        .val(function(val) {
+            return val || this.reject("Option '--datauri' must have one of the following values: 'base64', 'enc' or 'unenc'");
+        })
+        .end()
+    .opt()
+        .name('multipass').title('Enable multipass')
+        .long('multipass')
+        .flag()
+        .end()
+    .opt()
+        .name('pretty').title('Make SVG pretty printed')
+        .long('pretty')
+        .flag()
+        .end()
+    .opt()
+        .name('indent').title('Indent number when pretty printing SVGs')
+        .long('indent')
+        .val(function(val) {
+            return !isNaN(val) ? val : this.reject("Option '--indent' must be an integer number");
+        })
+        .end()
+    .opt()
+        .name('quiet').title('Only output error messages, not regular status messages')
+        .short('q').long('quiet')
+        .flag()
+        .end()
+    .opt()
+        .name('show-plugins').title('Show available plugins and exit')
+        .long('show-plugins')
+        .flag()
+        .end()
+    .arg()
+        .name('input').title('Alias to --input')
+        .end()
+    .arg()
+        .name('output').title('Alias to --output')
+        .end()
+    .act(function(opts, args) {
+
+        var input = args && args.input ? args.input : opts.input,
+            output = args && args.output ? args.output : opts.output,
+            config = {};
+
+        // --show-plugins
+        if (opts['show-plugins']) {
+
+            showAvailablePlugins();
+            process.exit(0);
+
+        }
+
+        // w/o anything
+        if (
+            (!input || input === '-') &&
+            !opts.string &&
+            !opts.stdin &&
+            !opts.folder &&
+            process.stdin.isTTY
+        ) return this.usage();
+
+
+        // --config
+        if (opts.config) {
+
+            // string
+            if (opts.config.charAt(0) === '{') {
+                try {
+                    config = JSON.parse(opts.config);
+                } catch (e) {
+                    console.error("Error: Couldn't parse config JSON.");
+                    console.error(String(e));
+                    return;
+                }
+
+            // external file
+            } else {
+                var configPath = PATH.resolve(opts.config);
+                try {
+                    // require() adds some weird output on YML files
+                    config = JSON.parse(FS.readFileSync(configPath, 'utf8'));
+                } catch (err) {
+                    if (err.code === 'ENOENT') {
+                        console.error('Error: couldn\'t find config file \'' + opts.config + '\'.');
+                        return;
+                    } else if (err.code === 'EISDIR') {
+                        console.error('Error: directory \'' + opts.config + '\' is not a config file.');
+                        return;
+                    }
+                    config = YAML.safeLoad(FS.readFileSync(configPath, 'utf8'));
+
+                    if (!config || Array.isArray(config)) {
+                        console.error('Error: invalid config file \'' + opts.config + '\'.');
+                        return;
+                    }
+                }
+            }
+
+        }
+
+        // --quiet
+        if (opts.quiet) {
+            config.quiet = opts.quiet;
+        }
+
+        // --precision
+        if (opts.precision) {
+            config.floatPrecision = Math.max(0, parseInt(opts.precision));
+        }
+
+        // --disable
+        if (opts.disable) {
+            changePluginsState(opts.disable, false, config);
+        }
+
+        // --enable
+        if (opts.enable) {
+            changePluginsState(opts.enable, true, config);
+        }
+
+        // --multipass
+        if (opts.multipass) {
+
+            config.multipass = true;
+
+        }
+
+        // --pretty
+        if (opts.pretty) {
+
+            config.js2svg = config.js2svg || {};
+            config.js2svg.pretty = true;
+            if (opts.indent) {
+                config.js2svg.indent = parseInt(opts.indent, 10);
+            }
+
+        }
+
+        // --output
+        if (opts.output) {
+            config.output = opts.output;
+        }
+
+        // --folder
+        if (opts.folder) {
+            optimizeFolder(opts.folder, config, output);
+
+            return;
+        }
+
+        // --input
+        if (input) {
+
+            // STDIN
+            if (input === '-') {
+
+                var data = '';
+
+                process.stdin.pause();
+
+                process.stdin
+                    .on('data', function(chunk) {
+                        data += chunk;
+                    })
+                    .once('end', function() {
+                        optimizeFromString(data, config, opts.datauri, input, output);
+                    })
+                    .resume();
+
+            // file
+            } else {
+
+                FS.readFile(input, 'utf8', function(err, data) {
+                    if (err) {
+                        if (err.code === 'EISDIR')
+                            optimizeFolder(input, config, output);
+                        else if (err.code === 'ENOENT')
+                            console.error('Error: no such file or directory \'' + input + '\'.');
+                        else
+                            console.error(err);
+                        return;
+                    }
+                    optimizeFromString(data, config, opts.datauri, input, output);
+                });
+
+            }
+
+        // --string
+        } else if (opts.string) {
+
+            opts.string = decodeSVGDatauri(opts.string);
+
+            optimizeFromString(opts.string, config, opts.datauri, input, output);
+
+        }
+    });
+
+function optimizeFromString(svgstr, config, datauri, input, output) {
+
+    var startTime = Date.now(config),
+        time,
+        inBytes = Buffer.byteLength(svgstr, 'utf8'),
+        outBytes,
+        svgo = new SVGO(config);
+
+    svgo.optimize(svgstr, function(result) {
+
+        if (result.error) {
+            console.error(result.error);
+            return;
+        }
+
+        if (datauri) {
+            result.data = encodeSVGDatauri(result.data, datauri);
+        }
+
+        outBytes = Buffer.byteLength(result.data, 'utf8');
+        time = Date.now() - startTime;
+
+        // stdout
+        if (output === '-' || (!input || input === '-') && !output) {
+
+            process.stdout.write(result.data + '\n');
+
+        // file
+        } else {
+
+            // overwrite input file if there is no output
+            if (!output && input) {
+                output = input;
+            }
+
+            if (!config.quiet) {
+                console.log('\r');
+            }
+
+            saveFileAndPrintInfo(config, result.data, output, inBytes, outBytes, time);
+
+        }
+
+    });
+
+}
+
+function saveFileAndPrintInfo(config, data, path, inBytes, outBytes, time) {
+
+    FS.writeFile(path, data, 'utf8', function() {
+        if (config.quiet) {
+            return;
+        }
+
+        // print time info
+        printTimeInfo(time);
+
+        // print optimization profit info
+        printProfitInfo(inBytes, outBytes);
+
+    });
+
+}
+
+function printTimeInfo(time) {
+    console.log('Done in ' + time + ' ms!');
+
+}
+
+function printProfitInfo(inBytes, outBytes) {
+
+    var profitPercents = 100 - outBytes * 100 / inBytes;
+
+    console.log(
+        (Math.round((inBytes / 1024) * 1000) / 1000) + ' KiB' +
+        (profitPercents < 0 ? ' + ' : ' - ') +
+        String(Math.abs((Math.round(profitPercents * 10) / 10)) + '%').green + ' = ' +
+        (Math.round((outBytes / 1024) * 1000) / 1000) + ' KiB\n'
+    );
+
+}
+
+/**
+ * Change plugins state by names array.
+ *
+ * @param {Array} names plugins names
+ * @param {Boolean} state active state
+ * @param {Object} config original config
+ * @return {Object} changed config
+ */
+function changePluginsState(names, state, config) {
+
+    // extend config
+    if (config.plugins) {
+
+        names.forEach(function(name) {
+
+            var matched,
+                key;
+
+            config.plugins.forEach(function(plugin) {
+
+                // get plugin name
+                if (typeof plugin === 'object') {
+                    key = Object.keys(plugin)[0];
+                } else {
+                    key = plugin;
+                }
+
+                // if there is such a plugin name
+                if (key === name) {
+                    // don't replace plugin's params with true
+                    if (typeof plugin[key] !== 'object' || !state) {
+                        plugin[key] = state;
+                    }
+
+                    // mark it as matched
+                    matched = true;
+                }
+
+            });
+
+            // if not matched and current config is not full
+            if (!matched && !config.full) {
+
+                var obj = {};
+
+                obj[name] = state;
+
+                // push new plugin Object
+                config.plugins.push(obj);
+
+                matched = true;
+
+            }
+
+        });
+
+    // just push
+    } else {
+
+        config.plugins = [];
+
+        names.forEach(function(name) {
+            var obj = {};
+
+            obj[name] = state;
+
+            config.plugins.push(obj);
+        });
+
+    }
+
+    return config;
+
+}
+
+function optimizeFolder(dir, config, output) {
+
+    var svgo = new SVGO(config);
+
+    if (!config.quiet) {
+        console.log('Processing directory \'' + dir + '\':\n');
+    }
+
+    // absoluted folder path
+    var path = PATH.resolve(dir);
+
+    // list folder content
+    FS.readdir(path, function(err, files) {
+
+        if (err) {
+            console.error(err);
+            return;
+        }
+
+        if (!files.length) {
+            console.log('Directory \'' + dir + '\' is empty.');
+            return;
+        }
+
+        var i = 0,
+            found = false;
+
+        function optimizeFile(file) {
+
+            // absoluted file path
+            var filepath = PATH.resolve(path, file);
+            var outfilepath = output ? PATH.resolve(output, file) : filepath;
+
+            // check if file name matches *.svg
+            if (regSVGFile.test(filepath)) {
+
+                found = true;
+                FS.readFile(filepath, 'utf8', function(err, data) {
+
+                    if (err) {
+                        console.error(err);
+                        return;
+                    }
+
+                    var startTime = Date.now(),
+                        time,
+                        inBytes = Buffer.byteLength(data, 'utf8'),
+                        outBytes;
+
+                    svgo.optimize(data, function(result) {
+
+                        if (result.error) {
+                            console.error(result.error);
+                            return;
+                        }
+
+                        outBytes = Buffer.byteLength(result.data, 'utf8');
+                        time = Date.now() - startTime;
+
+                        writeOutput();
+
+                        function writeOutput() {
+                            FS.writeFile(outfilepath, result.data, 'utf8', report);
+                        }
+
+                        function report(err) {
+
+                            if (err) {
+                                if (err.code === 'ENOENT') {
+                                    mkdirp(output, writeOutput);
+                                    return;
+                                } else if (err.code === 'ENOTDIR') {
+                                    console.error('Error: output \'' + output + '\' is not a directory.');
+                                    return;
+                                }
+                                console.error(err);
+                                return;
+                            }
+
+                            if (!config.quiet) {
+                                console.log(file + ':');
+
+                                // print time info
+                                printTimeInfo(time);
+
+                                // print optimization profit info
+                                printProfitInfo(inBytes, outBytes);
+                            }
+
+                            //move on to the next file
+                            if (++i < files.length) {
+                                optimizeFile(files[i]);
+                            }
+
+                        }
+
+                    });
+
+                });
+
+            }
+            //move on to the next file
+            else if (++i < files.length) {
+                optimizeFile(files[i]);
+            } else if (!found) {
+                console.log('No SVG files have been found.');
+            }
+
+
+        }
+
+        optimizeFile(files[i]);
+
+    });
+
+}
+
+
+var showAvailablePlugins = function () {
+
+    var svgo = new SVGO(),
+        // Flatten an array of plugins grouped per type and sort alphabetically
+        list = Array.prototype.concat.apply([], svgo.config.plugins).sort(function(a, b) {
+            return a.name > b.name ? 1 : -1;
+        });
+
+    console.log('Currently available plugins:');
+
+    list.forEach(function (plugin) {
+        console.log(' [ ' + plugin.name.green + ' ] ' + plugin.description);
+    });
+
+    //console.log(JSON.stringify(svgo, null, 4));
+};
diff --git a/node_modules/svgo/lib/svgo/config.js b/node_modules/svgo/lib/svgo/config.js
new file mode 100644
index 00000000..093067d4
--- /dev/null
+++ b/node_modules/svgo/lib/svgo/config.js
@@ -0,0 +1,212 @@
+'use strict';
+
+var FS = require('fs');
+var yaml = require('js-yaml');
+
+var EXTEND = require('whet.extend');
+
+/**
+ * Read and/or extend/replace default config file,
+ * prepare and optimize plugins array.
+ *
+ * @param {Object} [config] input config
+ * @return {Object} output config
+ */
+module.exports = function(config) {
+
+    var defaults;
+    config = typeof config == 'object' && config || {};
+
+    if (config.plugins && !Array.isArray(config.plugins)) {
+        return { error: 'Error: Invalid plugins list. Provided \'plugins\' in config should be an array.' };
+    }
+
+    if (config.full) {
+        defaults = config;
+
+        if (Array.isArray(defaults.plugins)) {
+            defaults.plugins = preparePluginsArray(defaults.plugins);
+        }
+    } else {
+        defaults = EXTEND({}, yaml.safeLoad(FS.readFileSync(__dirname + '/../../.svgo.yml', 'utf8')));
+        defaults.plugins = preparePluginsArray(defaults.plugins);
+        defaults = extendConfig(defaults, config);
+    }
+
+    if ('floatPrecision' in config && Array.isArray(defaults.plugins)) {
+        defaults.plugins.forEach(function(plugin) {
+            if (plugin.params && ('floatPrecision' in plugin.params)) {
+                // Don't touch default plugin params
+                plugin.params = EXTEND({}, plugin.params, { floatPrecision: config.floatPrecision });
+            }
+        });
+    }
+
+    if (Array.isArray(defaults.plugins)) {
+        defaults.plugins = optimizePluginsArray(defaults.plugins);
+    }
+
+    return defaults;
+
+};
+
+/**
+ * Require() all plugins in array.
+ *
+ * @param {Array} plugins input plugins array
+ * @return {Array} input plugins array of arrays
+ */
+function preparePluginsArray(plugins) {
+
+    var plugin,
+        key;
+
+    return plugins.map(function(item) {
+
+        // {}
+        if (typeof item === 'object') {
+
+            key = Object.keys(item)[0];
+
+            // custom
+            if (typeof item[key] === 'object' && item[key].fn && typeof item[key].fn === 'function') {
+                plugin = setupCustomPlugin(key, item[key]);
+
+            } else {
+
+              plugin = EXTEND({}, require('../../plugins/' + key));
+
+              // name: {}
+              if (typeof item[key] === 'object') {
+                  plugin.params = EXTEND({}, plugin.params || {}, item[key]);
+                  plugin.active = true;
+
+              // name: false
+              } else if (item[key] === false) {
+                 plugin.active = false;
+
+              // name: true
+              } else if (item[key] === true) {
+                 plugin.active = true;
+              }
+
+              plugin.name = key;
+            }
+
+        // name
+        } else {
+
+            plugin = EXTEND({}, require('../../plugins/' + item));
+            plugin.name = item;
+
+        }
+
+        return plugin;
+
+    });
+
+}
+
+/**
+ * Extend plugins with the custom config object.
+ *
+ * @param {Array} plugins input plugins
+ * @param {Object} config config
+ * @return {Array} output plugins
+ */
+function extendConfig(defaults, config) {
+
+    var key;
+
+    // plugins
+    if (config.plugins) {
+
+        config.plugins.forEach(function(item) {
+
+            // {}
+            if (typeof item === 'object') {
+
+                key = Object.keys(item)[0];
+
+                // custom
+                if (typeof item[key] === 'object' && item[key].fn && typeof item[key].fn === 'function') {
+                    defaults.plugins.push(setupCustomPlugin(key, item[key]));
+
+                } else {
+                    defaults.plugins.forEach(function(plugin) {
+
+                        if (plugin.name === key) {
+                            // name: {}
+                            if (typeof item[key] === 'object') {
+                                plugin.params = EXTEND({}, plugin.params || {}, item[key]);
+                                plugin.active = true;
+
+                            // name: false
+                            } else if (item[key] === false) {
+                               plugin.active = false;
+
+                            // name: true
+                            } else if (item[key] === true) {
+                               plugin.active = true;
+                            }
+                        }
+                    });
+                }
+
+            }
+
+        });
+
+    }
+
+    defaults.multipass = config.multipass;
+
+    // svg2js
+    if (config.svg2js) {
+        defaults.svg2js = config.svg2js;
+    }
+
+    // js2svg
+    if (config.js2svg) {
+        defaults.js2svg = config.js2svg;
+    }
+
+    return defaults;
+
+}
+
+/**
+ * Setup and enable a custom plugin
+ *
+ * @param {String} plugin name
+ * @param {Object} custom plugin
+ * @return {Array} enabled plugin
+ */
+function setupCustomPlugin(name, plugin) {
+    plugin.active = true;
+    plugin.params = EXTEND({}, plugin.params || {});
+    plugin.name = name;
+
+    return plugin;
+}
+
+/**
+ * Try to group sequential elements of plugins array.
+ *
+ * @param {Object} plugins input plugins
+ * @return {Array} output plugins
+ */
+function optimizePluginsArray(plugins) {
+
+    var prev;
+
+    return plugins.reduce(function(plugins, item) {
+        if (prev && item.type == prev[0].type) {
+            prev.push(item);
+        } else {
+            plugins.push(prev = [item]);
+        }
+        return plugins;
+    }, []);
+
+}
diff --git a/node_modules/svgo/lib/svgo/js2svg.js b/node_modules/svgo/lib/svgo/js2svg.js
new file mode 100644
index 00000000..5d19cc8d
--- /dev/null
+++ b/node_modules/svgo/lib/svgo/js2svg.js
@@ -0,0 +1,352 @@
+'use strict';
+
+var EOL = require('os').EOL,
+    EXTEND = require('whet.extend'),
+    textElem = require('../../plugins/_collections.js').elemsGroups.textContent.concat('title');
+
+var defaults = {
+    doctypeStart: '<!DOCTYPE',
+    doctypeEnd: '>',
+    procInstStart: '<?',
+    procInstEnd: '?>',
+    tagOpenStart: '<',
+    tagOpenEnd: '>',
+    tagCloseStart: '</',
+    tagCloseEnd: '>',
+    tagShortStart: '<',
+    tagShortEnd: '/>',
+    attrStart: '="',
+    attrEnd: '"',
+    commentStart: '<!--',
+    commentEnd: '-->',
+    cdataStart: '<![CDATA[',
+    cdataEnd: ']]>',
+    textStart: '',
+    textEnd: '',
+    indent: 4,
+    regEntities: /[&'"<>]/g,
+    regValEntities: /[&"<>]/g,
+    encodeEntity: encodeEntity,
+    pretty: false,
+    useShortTags: true
+};
+
+var entities = {
+      '&': '&amp;',
+      '\'': '&apos;',
+      '"': '&quot;',
+      '>': '&gt;',
+      '<': '&lt;',
+    };
+
+/**
+ * Convert SVG-as-JS object to SVG (XML) string.
+ *
+ * @param {Object} data input data
+ * @param {Object} config config
+ *
+ * @return {Object} output data
+ */
+module.exports = function(data, config) {
+
+    return new JS2SVG(config).convert(data);
+
+};
+
+function JS2SVG(config) {
+
+    if (config) {
+        this.config = EXTEND(true, {}, defaults, config);
+    } else {
+        this.config = defaults;
+    }
+
+    var indent = this.config.indent;
+    if (typeof indent == 'number' && !isNaN(indent)) {
+        this.config.indent = '';
+        for (var i = indent; i-- > 0;) this.config.indent += ' ';
+    } else if (typeof indent != 'string') {
+        this.config.indent = '    ';
+    }
+
+    if (this.config.pretty) {
+        this.config.doctypeEnd += EOL;
+        this.config.procInstEnd += EOL;
+        this.config.commentEnd += EOL;
+        this.config.cdataEnd += EOL;
+        this.config.tagShortEnd += EOL;
+        this.config.tagOpenEnd += EOL;
+        this.config.tagCloseEnd += EOL;
+        this.config.textEnd += EOL;
+    }
+
+    this.indentLevel = 0;
+    this.textContext = null;
+
+}
+
+function encodeEntity(char) {
+    return entities[char];
+}
+
+/**
+ * Start conversion.
+ *
+ * @param {Object} data input data
+ *
+ * @return {String}
+ */
+JS2SVG.prototype.convert = function(data) {
+
+    var svg = '';
+
+    if (data.content) {
+
+        this.indentLevel++;
+
+        data.content.forEach(function(item) {
+
+            if (item.elem) {
+               svg += this.createElem(item);
+            } else if (item.text) {
+               svg += this.createText(item.text);
+            } else if (item.doctype) {
+                svg += this.createDoctype(item.doctype);
+            } else if (item.processinginstruction) {
+                svg += this.createProcInst(item.processinginstruction);
+            } else if (item.comment) {
+                svg += this.createComment(item.comment);
+            } else if (item.cdata) {
+                svg += this.createCDATA(item.cdata);
+            }
+
+        }, this);
+
+    }
+
+    this.indentLevel--;
+
+    return {
+        data: svg,
+        info: {
+            width: this.width,
+            height: this.height
+        }
+    };
+
+};
+
+/**
+ * Create indent string in accordance with the current node level.
+ *
+ * @return {String}
+ */
+JS2SVG.prototype.createIndent = function() {
+
+    var indent = '';
+
+    if (this.config.pretty && !this.textContext) {
+        for (var i = 1; i < this.indentLevel; i++) {
+            indent += this.config.indent;
+        }
+    }
+
+    return indent;
+
+};
+
+/**
+ * Create doctype tag.
+ *
+ * @param {String} doctype doctype body string
+ *
+ * @return {String}
+ */
+JS2SVG.prototype.createDoctype = function(doctype) {
+
+    return  this.config.doctypeStart +
+            doctype +
+            this.config.doctypeEnd;
+
+};
+
+/**
+ * Create XML Processing Instruction tag.
+ *
+ * @param {Object} instruction instruction object
+ *
+ * @return {String}
+ */
+JS2SVG.prototype.createProcInst = function(instruction) {
+
+    return  this.config.procInstStart +
+            instruction.name +
+            ' ' +
+            instruction.body +
+            this.config.procInstEnd;
+
+};
+
+/**
+ * Create comment tag.
+ *
+ * @param {String} comment comment body
+ *
+ * @return {String}
+ */
+JS2SVG.prototype.createComment = function(comment) {
+
+    return  this.config.commentStart +
+            comment +
+            this.config.commentEnd;
+
+};
+
+/**
+ * Create CDATA section.
+ *
+ * @param {String} cdata CDATA body
+ *
+ * @return {String}
+ */
+JS2SVG.prototype.createCDATA = function(cdata) {
+
+    return  this.createIndent() +
+            this.config.cdataStart +
+            cdata +
+            this.config.cdataEnd;
+
+};
+
+/**
+ * Create element tag.
+ *
+ * @param {Object} data element object
+ *
+ * @return {String}
+ */
+JS2SVG.prototype.createElem = function(data) {
+
+    // beautiful injection for obtaining SVG information :)
+    if (
+        data.isElem('svg') &&
+        data.hasAttr('width') &&
+        data.hasAttr('height')
+    ) {
+        this.width = data.attr('width').value;
+        this.height = data.attr('height').value;
+    }
+
+    // empty element and short tag
+    if (data.isEmpty()) {
+        if (this.config.useShortTags) {
+            return this.createIndent() +
+                   this.config.tagShortStart +
+                   data.elem +
+                   this.createAttrs(data) +
+                   this.config.tagShortEnd;
+        } else {
+            return this.createIndent() +
+                   this.config.tagShortStart +
+                   data.elem +
+                   this.createAttrs(data) +
+                   this.config.tagOpenEnd +
+                   this.config.tagCloseStart +
+                   data.elem +
+                   this.config.tagCloseEnd;
+        }
+    // non-empty element
+    } else {
+        var tagOpenStart = this.config.tagOpenStart,
+            tagOpenEnd = this.config.tagOpenEnd,
+            tagCloseStart = this.config.tagCloseStart,
+            tagCloseEnd = this.config.tagCloseEnd,
+            openIndent = this.createIndent(),
+            textIndent = '',
+            processedData = '',
+            dataEnd = '';
+
+        if (this.textContext) {
+            tagOpenStart = defaults.tagOpenStart;
+            tagOpenEnd = defaults.tagOpenEnd;
+            tagCloseStart = defaults.tagCloseStart;
+            tagCloseEnd = defaults.tagCloseEnd;
+            openIndent = '';
+        } else if (data.isElem(textElem)) {
+            if (this.config.pretty) {
+                textIndent += openIndent + this.config.indent;
+            }
+            this.textContext = data;
+        }
+
+        processedData += this.convert(data).data;
+
+        if (this.textContext == data) {
+            this.textContext = null;
+            if (this.config.pretty) dataEnd = EOL;
+        }
+
+        return  openIndent +
+                tagOpenStart +
+                data.elem +
+                this.createAttrs(data) +
+                tagOpenEnd +
+                textIndent +
+                processedData +
+                dataEnd +
+                this.createIndent() +
+                tagCloseStart +
+                data.elem +
+                tagCloseEnd;
+
+    }
+
+};
+
+/**
+ * Create element attributes.
+ *
+ * @param {Object} elem attributes object
+ *
+ * @return {String}
+ */
+JS2SVG.prototype.createAttrs = function(elem) {
+
+    var attrs = '';
+
+    elem.eachAttr(function(attr) {
+
+        if (attr.value !== undefined) {
+            attrs +=    ' ' +
+                        attr.name +
+                        this.config.attrStart +
+                        String(attr.value).replace(this.config.regValEntities, this.config.encodeEntity) +
+                        this.config.attrEnd;
+        }
+        else {
+            attrs +=    ' ' +
+                        attr.name;
+        }
+
+
+    }, this);
+
+    return attrs;
+
+};
+
+/**
+ * Create text node.
+ *
+ * @param {String} text text
+ *
+ * @return {String}
+ */
+JS2SVG.prototype.createText = function(text) {
+
+    return  this.createIndent() +
+            this.config.textStart +
+            text.replace(this.config.regEntities, this.config.encodeEntity) +
+            (this.textContext ? '' : this.config.textEnd);
+
+};
diff --git a/node_modules/svgo/lib/svgo/jsAPI.js b/node_modules/svgo/lib/svgo/jsAPI.js
new file mode 100644
index 00000000..1e2f55fb
--- /dev/null
+++ b/node_modules/svgo/lib/svgo/jsAPI.js
@@ -0,0 +1,298 @@
+'use strict';
+
+var EXTEND = require('whet.extend');
+
+var JSAPI = module.exports = function(data, parentNode) {
+    EXTEND(this, data);
+    if (parentNode) {
+        Object.defineProperty(this, 'parentNode', {
+            writable: true,
+            value: parentNode
+        });
+    }
+};
+
+/**
+ * Perform a deep clone of this node.
+ *
+ * @return {Object} element
+ */
+JSAPI.prototype.clone = function() {
+    var node = this;
+    var nodeData = {};
+
+    Object.keys(node).forEach(function(key) {
+        if (key !== 'content') {
+            nodeData[key] = node[key];
+        }
+    });
+
+    // Deep-clone node data
+    // This is still faster than using EXTEND(true…)
+    nodeData = JSON.parse(JSON.stringify(nodeData));
+
+    // parentNode gets set to a proper object by the parent clone,
+    // but it needs to be true/false now to do the right thing
+    // in the constructor.
+    var clonedNode = new JSAPI(nodeData, !!node.parentNode);
+
+    if (node.content) {
+        clonedNode.content = node.content.map(function(childNode) {
+            var clonedChild = childNode.clone();
+            clonedChild.parentNode = clonedNode;
+            return clonedChild;
+        });
+    }
+
+    return clonedNode;
+};
+
+/**
+ * Determine if item is an element
+ * (any, with a specific name or in a names array).
+ *
+ * @param {String|Array} [param] element name or names arrays
+ * @return {Boolean}
+ */
+JSAPI.prototype.isElem = function(param) {
+
+    if (!param) return !!this.elem;
+
+    if (Array.isArray(param)) return !!this.elem && (param.indexOf(this.elem) > -1);
+
+    return !!this.elem && this.elem === param;
+
+};
+
+/**
+ * Renames an element
+ *
+ * @param {String} name new element name
+ * @return {Object} element
+ */
+JSAPI.prototype.renameElem = function(name) {
+
+    if (name && typeof name === 'string')
+        this.elem = this.local = name;
+
+    return this;
+
+};
+
+/**
+ * Determine if element is empty.
+ *
+ * @return {Boolean}
+ */
+ JSAPI.prototype.isEmpty = function() {
+
+    return !this.content || !this.content.length;
+
+};
+
+/**
+ * Changes content by removing elements and/or adding new elements.
+ *
+ * @param {Number} start Index at which to start changing the content.
+ * @param {Number} n Number of elements to remove.
+ * @param {Array|Object} [insertion] Elements to add to the content.
+ * @return {Array} Removed elements.
+ */
+ JSAPI.prototype.spliceContent = function(start, n, insertion) {
+
+    if (arguments.length < 2) return [];
+
+    if (!Array.isArray(insertion))
+        insertion = Array.apply(null, arguments).slice(2);
+
+    insertion.forEach(function(inner) { inner.parentNode = this }, this);
+
+    return this.content.splice.apply(this.content, [start, n].concat(insertion));
+
+
+};
+
+/**
+ * Determine if element has an attribute
+ * (any, or by name or by name + value).
+ *
+ * @param {String} [name] attribute name
+ * @param {String} [val] attribute value (will be toString()'ed)
+ * @return {Boolean}
+ */
+ JSAPI.prototype.hasAttr = function(name, val) {
+
+    if (!this.attrs || !Object.keys(this.attrs).length) return false;
+
+    if (!arguments.length) return !!this.attrs;
+
+    if (val !== undefined) return !!this.attrs[name] && this.attrs[name].value === val.toString();
+
+    return !!this.attrs[name];
+
+};
+
+/**
+ * Determine if element has an attribute by local name
+ * (any, or by name or by name + value).
+ *
+ * @param {String} [localName] local attribute name
+ * @param {Number|String|RegExp|Function} [val] attribute value (will be toString()'ed or executed, otherwise ignored)
+ * @return {Boolean}
+ */
+ JSAPI.prototype.hasAttrLocal = function(localName, val) {
+
+    if (!this.attrs || !Object.keys(this.attrs).length) return false;
+
+    if (!arguments.length) return !!this.attrs;
+
+    var callback;
+
+    switch (val != null && val.constructor && val.constructor.name) {
+        case 'Number':   // same as String
+        case 'String':   callback = stringValueTest; break;
+        case 'RegExp':   callback = regexpValueTest; break;
+        case 'Function': callback = funcValueTest; break;
+        default:         callback = nameTest;
+    }
+    return this.someAttr(callback);
+
+    function nameTest(attr) {
+        return attr.local === localName;
+    }
+
+    function stringValueTest(attr) {
+        return attr.local === localName && val == attr.value;
+    }
+
+    function regexpValueTest(attr) {
+        return attr.local === localName && val.test(attr.value);
+    }
+
+    function funcValueTest(attr) {
+        return attr.local === localName && val(attr.value);
+    }
+
+};
+
+/**
+ * Get a specific attribute from an element
+ * (by name or name + value).
+ *
+ * @param {String} name attribute name
+ * @param {String} [val] attribute value (will be toString()'ed)
+ * @return {Object|Undefined}
+ */
+ JSAPI.prototype.attr = function(name, val) {
+
+    if (!this.hasAttr() || !arguments.length) return undefined;
+
+    if (val !== undefined) return this.hasAttr(name, val) ? this.attrs[name] : undefined;
+
+    return this.attrs[name];
+
+};
+
+/**
+ * Get computed attribute value from an element
+ *
+ * @param {String} name attribute name
+ * @return {Object|Undefined}
+ */
+ JSAPI.prototype.computedAttr = function(name, val) {
+    /* jshint eqnull: true */
+    if (!arguments.length) return;
+
+    for (var elem = this; elem && (!elem.hasAttr(name) || !elem.attr(name).value); elem = elem.parentNode);
+
+    if (val != null) {
+        return elem ? elem.hasAttr(name, val) : false;
+    } else if (elem && elem.hasAttr(name)) {
+        return elem.attrs[name].value;
+    }
+
+};
+
+/**
+ * Remove a specific attribute.
+ *
+ * @param {String|Array} name attribute name
+ * @param {String} [val] attribute value
+ * @return {Boolean}
+ */
+ JSAPI.prototype.removeAttr = function(name, val, recursive) {
+
+    if (!arguments.length) return false;
+
+    if (Array.isArray(name)) name.forEach(this.removeAttr, this);
+
+    if (!this.hasAttr(name)) return false;
+
+    if (!recursive && val && this.attrs[name].value !== val) return false;
+
+    delete this.attrs[name];
+
+    if (!Object.keys(this.attrs).length) delete this.attrs;
+
+    return true;
+
+};
+
+/**
+ * Add attribute.
+ *
+ * @param {Object} [attr={}] attribute object
+ * @return {Object|Boolean} created attribute or false if no attr was passed in
+ */
+ JSAPI.prototype.addAttr = function(attr) {
+    attr = attr || {};
+
+    if (attr.name === undefined ||
+        attr.prefix === undefined ||
+        attr.local === undefined
+    ) return false;
+
+    this.attrs = this.attrs || {};
+    this.attrs[attr.name] = attr;
+
+    return this.attrs[attr.name];
+
+};
+
+/**
+ * Iterates over all attributes.
+ *
+ * @param {Function} callback callback
+ * @param {Object} [context] callback context
+ * @return {Boolean} false if there are no any attributes
+ */
+ JSAPI.prototype.eachAttr = function(callback, context) {
+
+    if (!this.hasAttr()) return false;
+
+    for (var name in this.attrs) {
+        callback.call(context, this.attrs[name]);
+    }
+
+    return true;
+
+};
+
+/**
+ * Tests whether some attribute passes the test.
+ *
+ * @param {Function} callback callback
+ * @param {Object} [context] callback context
+ * @return {Boolean} false if there are no any attributes
+ */
+ JSAPI.prototype.someAttr = function(callback, context) {
+
+    if (!this.hasAttr()) return false;
+
+    for (var name in this.attrs) {
+        if (callback.call(context, this.attrs[name])) return true;
+    }
+
+    return false;
+
+};
diff --git a/node_modules/svgo/lib/svgo/plugins.js b/node_modules/svgo/lib/svgo/plugins.js
new file mode 100644
index 00000000..4e0308da
--- /dev/null
+++ b/node_modules/svgo/lib/svgo/plugins.js
@@ -0,0 +1,98 @@
+'use strict';
+
+/**
+ * Plugins engine.
+ *
+ * @module plugins
+ *
+ * @param {Object} data input data
+ * @param {Object} plugins plugins object from config
+ * @return {Object} output data
+ */
+module.exports = function(data, plugins) {
+
+    plugins.forEach(function(group) {
+
+        switch(group[0].type) {
+            case 'perItem':
+                data = perItem(data, group);
+                break;
+            case 'perItemReverse':
+                data = perItem(data, group, true);
+                break;
+            case 'full':
+                data = full(data, group);
+                break;
+        }
+
+    });
+
+    return data;
+
+};
+
+/**
+ * Direct or reverse per-item loop.
+ *
+ * @param {Object} data input data
+ * @param {Array} plugins plugins list to process
+ * @param {Boolean} [reverse] reverse pass?
+ * @return {Object} output data
+ */
+function perItem(data, plugins, reverse) {
+
+    function monkeys(items) {
+
+        items.content = items.content.filter(function(item) {
+
+            // reverse pass
+            if (reverse && item.content) {
+                monkeys(item);
+            }
+
+            // main filter
+            var filter = true;
+
+            for (var i = 0; filter && i < plugins.length; i++) {
+                var plugin = plugins[i];
+
+                if (plugin.active && plugin.fn(item, plugin.params) === false) {
+                    filter = false;
+                }
+            }
+
+            // direct pass
+            if (!reverse && item.content) {
+                monkeys(item);
+            }
+
+            return filter;
+
+        });
+
+        return items;
+
+    }
+
+    return monkeys(data);
+
+}
+
+/**
+ * "Full" plugins.
+ *
+ * @param {Object} data input data
+ * @param {Array} plugins plugins list to process
+ * @return {Object} output data
+ */
+function full(data, plugins) {
+
+    plugins.forEach(function(plugin) {
+        if (plugin.active) {
+            data = plugin.fn(data, plugin.params);
+        }
+    });
+
+    return data;
+
+}
diff --git a/node_modules/svgo/lib/svgo/svg2js.js b/node_modules/svgo/lib/svgo/svg2js.js
new file mode 100644
index 00000000..2c36900c
--- /dev/null
+++ b/node_modules/svgo/lib/svgo/svg2js.js
@@ -0,0 +1,187 @@
+'use strict';
+
+var SAX = require('sax'),
+    JSAPI = require('./jsAPI.js'),
+    entityDeclaration = /<!ENTITY\s+(\S+)\s+(?:'([^\']+)'|"([^\"]+)")\s*>/g;
+
+var config = {
+    strict: true,
+    trim: false,
+    normalize: true,
+    lowercase: true,
+    xmlns: true,
+    position: true
+};
+
+/**
+ * Convert SVG (XML) string to SVG-as-JS object.
+ *
+ * @param {String} data input data
+ * @param {Function} callback
+ */
+module.exports = function(data, callback) {
+
+    var sax = SAX.parser(config.strict, config),
+        root = new JSAPI({ elem: '#document' }),
+        current = root,
+        stack = [root],
+        textContext = null,
+        parsingError = false;
+
+    function pushToContent(content) {
+
+        content = new JSAPI(content, current);
+
+        (current.content = current.content || []).push(content);
+
+        return content;
+
+    }
+
+    sax.ondoctype = function(doctype) {
+
+        pushToContent({
+            doctype: doctype
+        });
+
+        var subsetStart = doctype.indexOf('['),
+            entityMatch;
+
+        if (subsetStart >= 0) {
+            entityDeclaration.lastIndex = subsetStart;
+
+            while ((entityMatch = entityDeclaration.exec(data)) != null) {
+                sax.ENTITIES[entityMatch[1]] = entityMatch[2] || entityMatch[3];
+            }
+        }
+    };
+
+    sax.onprocessinginstruction = function(data) {
+
+        pushToContent({
+            processinginstruction: data
+        });
+
+    };
+
+    sax.oncomment = function(comment) {
+
+        pushToContent({
+            comment: comment.trim()
+        });
+
+    };
+
+    sax.oncdata = function(cdata) {
+
+        pushToContent({
+            cdata: cdata
+        });
+
+    };
+
+    sax.onopentag = function(data) {
+
+        var elem = {
+            elem: data.name,
+            prefix: data.prefix,
+            local: data.local
+        };
+
+        if (Object.keys(data.attributes).length) {
+            elem.attrs = {};
+
+            for (var name in data.attributes) {
+                elem.attrs[name] = {
+                    name: name,
+                    value: data.attributes[name].value,
+                    prefix: data.attributes[name].prefix,
+                    local: data.attributes[name].local
+                };
+            }
+        }
+
+        elem = pushToContent(elem);
+        current = elem;
+
+        // Save info about <text> tag to prevent trimming of meaningful whitespace
+        if (data.name == 'text' && !data.prefix) {
+            textContext = current;
+        }
+
+        stack.push(elem);
+
+    };
+
+    sax.ontext = function(text) {
+
+        if (/\S/.test(text) || textContext) {
+
+            if (!textContext)
+                text = text.trim();
+
+            pushToContent({
+                text: text
+            });
+
+        }
+
+    };
+
+    sax.onclosetag = function() {
+
+        var last = stack.pop();
+
+        // Trim text inside <text> tag.
+        if (last == textContext) {
+            trim(textContext);
+            textContext = null;
+        }
+        current = stack[stack.length - 1];
+
+    };
+
+    sax.onerror = function(e) {
+
+        e.message = 'Error in parsing SVG: ' + e.message;
+        if (e.message.indexOf('Unexpected end') < 0) {
+            throw e;
+        }
+
+    };
+
+    sax.onend = function() {
+
+        if (!this.error) {
+            callback(root);
+        } else {
+            callback({ error: this.error.message });
+        }
+
+    };
+
+    try {
+        sax.write(data);
+    } catch (e) {
+        callback({ error: e.message });
+        parsingError = true;
+    }
+    if (!parsingError) sax.close();
+
+    function trim(elem) {
+        if (!elem.content) return elem;
+
+        var start = elem.content[0],
+            end = elem.content[elem.content.length - 1];
+
+        while (start && start.content && !start.text) start = start.content[0];
+        if (start && start.text) start.text = start.text.replace(/^\s+/, '');
+
+        while (end && end.content && !end.text) end = end.content[end.content.length - 1];
+        if (end && end.text) end.text = end.text.replace(/\s+$/, '');
+
+        return elem;
+
+    }
+
+};
diff --git a/node_modules/svgo/lib/svgo/tools.js b/node_modules/svgo/lib/svgo/tools.js
new file mode 100644
index 00000000..7dd33c07
--- /dev/null
+++ b/node_modules/svgo/lib/svgo/tools.js
@@ -0,0 +1,147 @@
+'use strict';
+
+/**
+ * Encode plain SVG data string into Data URI string.
+ *
+ * @param {String} str input string
+ * @param {String} type Data URI type
+ * @return {String} output string
+ */
+exports.encodeSVGDatauri = function(str, type) {
+
+    var prefix = 'data:image/svg+xml';
+
+    // base64
+    if (!type || type === 'base64') {
+
+        prefix += ';base64,';
+
+        str = prefix + new Buffer(str).toString('base64');
+
+    // URI encoded
+    } else if (type === 'enc') {
+
+        str = prefix + ',' + encodeURIComponent(str);
+
+    // unencoded
+    } else if (type === 'unenc') {
+
+        str = prefix + ',' + str;
+
+    }
+
+    return str;
+
+};
+
+/**
+ * Decode SVG Data URI string into plain SVG string.
+ *
+ * @param {string} str input string
+ * @return {String} output string
+ */
+exports.decodeSVGDatauri = function(str) {
+    var regexp = /data:image\/svg\+xml(;charset=[^;,]*)?(;base64)?,(.*)/;
+    var match = regexp.exec(str);
+
+    // plain string
+    if (!match) return str;
+
+    var data = match[3];
+
+    // base64
+    if (match[2]) {
+
+        str = new Buffer(data, 'base64').toString('utf8');
+
+    // URI encoded
+    } else if (data.charAt(0) === '%') {
+
+        str = decodeURIComponent(data);
+
+    // unencoded
+    } else if (data.charAt(0) === '<') {
+
+        str = data;
+
+    }
+
+    return str;
+};
+
+exports.intersectArrays = function(a, b) {
+    return a.filter(function(n) {
+        return b.indexOf(n) > -1;
+    });
+};
+
+exports.cleanupOutData = function(data, params) {
+
+    var str = '',
+        delimiter,
+        prev;
+
+    data.forEach(function(item, i) {
+
+        // space delimiter by default
+        delimiter = ' ';
+
+        // no extra space in front of first number
+        if (i === 0) {
+            delimiter = '';
+        }
+
+        // remove floating-point numbers leading zeros
+        // 0.5 → .5
+        // -0.5 → -.5
+        if (params.leadingZero) {
+            item = removeLeadingZero(item);
+        }
+
+        // no extra space in front of negative number or
+        // in front of a floating number if a previous number is floating too
+        if (
+            params.negativeExtraSpace &&
+            (item < 0 ||
+                (String(item).charCodeAt(0) == 46 && prev % 1 !== 0)
+            )
+        ) {
+            delimiter = '';
+        }
+
+        // save prev item value
+        prev = item;
+
+        str += delimiter + item;
+
+    });
+
+    return str;
+
+};
+
+/**
+ * Remove floating-point numbers leading zero.
+ *
+ * @example
+ * 0.5 → .5
+ *
+ * @example
+ * -0.5 → -.5
+ *
+ * @param {Float} num input number
+ *
+ * @return {String} output number as string
+ */
+var removeLeadingZero = exports.removeLeadingZero = function(num) {
+    var strNum = num.toString();
+
+    if (0 < num && num < 1 && strNum.charCodeAt(0) == 48) {
+        strNum = strNum.slice(1);
+    } else if (-1 < num && num < 0 && strNum.charCodeAt(1) == 48) {
+        strNum = strNum.charAt(0) + strNum.slice(2);
+    }
+
+    return strNum;
+
+};
diff --git a/node_modules/svgo/node_modules/.bin/csso b/node_modules/svgo/node_modules/.bin/csso
new file mode 120000
index 00000000..b14445ba
--- /dev/null
+++ b/node_modules/svgo/node_modules/.bin/csso
@@ -0,0 +1 @@
+../../../csso/bin/csso
\ No newline at end of file
diff --git a/node_modules/svgo/node_modules/.bin/js-yaml b/node_modules/svgo/node_modules/.bin/js-yaml
new file mode 120000
index 00000000..9dbd010d
--- /dev/null
+++ b/node_modules/svgo/node_modules/.bin/js-yaml
@@ -0,0 +1 @@
+../js-yaml/bin/js-yaml.js
\ No newline at end of file
diff --git a/node_modules/svgo/node_modules/.bin/mkdirp b/node_modules/svgo/node_modules/.bin/mkdirp
new file mode 120000
index 00000000..91a5f623
--- /dev/null
+++ b/node_modules/svgo/node_modules/.bin/mkdirp
@@ -0,0 +1 @@
+../../../mkdirp/bin/cmd.js
\ No newline at end of file
diff --git a/node_modules/svgo/node_modules/esprima/.bin/esparse b/node_modules/svgo/node_modules/esprima/.bin/esparse
new file mode 120000
index 00000000..88083f29
--- /dev/null
+++ b/node_modules/svgo/node_modules/esprima/.bin/esparse
@@ -0,0 +1 @@
+../bin/esparse.js
\ No newline at end of file
diff --git a/node_modules/svgo/node_modules/esprima/.bin/esvalidate b/node_modules/svgo/node_modules/esprima/.bin/esvalidate
new file mode 120000
index 00000000..5f4621b4
--- /dev/null
+++ b/node_modules/svgo/node_modules/esprima/.bin/esvalidate
@@ -0,0 +1 @@
+../bin/esvalidate.js
\ No newline at end of file
diff --git a/node_modules/svgo/node_modules/esprima/ChangeLog b/node_modules/svgo/node_modules/esprima/ChangeLog
new file mode 100644
index 00000000..fd687ae3
--- /dev/null
+++ b/node_modules/svgo/node_modules/esprima/ChangeLog
@@ -0,0 +1,174 @@
+2016-08-23: Version 2.7.3
+
+      * Fix tokenizer confusion with a comment (issue 1493, 1516)
+
+2016-02-02: Version 2.7.2
+
+      * Fix out-of-bound error location in an invalid string literal (issue 1457)
+      * Fix shorthand object destructuring defaults in variable declarations (issue 1459)
+
+2015-12-10: Version 2.7.1
+
+      * Do not allow trailing comma in a variable declaration (issue 1360)
+      * Fix assignment to `let` in non-strict mode (issue 1376)
+      * Fix missing delegate property in YieldExpression (issue 1407)
+
+2015-10-22: Version 2.7.0
+
+      * Fix the handling of semicolon in a break statement (issue 1044)
+      * Run the test suite with major web browsers (issue 1259, 1317)
+      * Allow `let` as an identifier in non-strict mode (issue 1289)
+      * Attach orphaned comments as `innerComments` (issue 1328)
+      * Add the support for token delegator (issue 1332)
+
+2015-09-01: Version 2.6.0
+
+      * Properly allow or prohibit `let` in a binding identifier/pattern (issue 1048, 1098)
+      * Add sourceType field for Program node (issue 1159)
+      * Ensure that strict mode reserved word binding throw an error (issue 1171)
+      * Run the test suite with Node.js and IE 11 on Windows (issue 1294)
+      * Allow binding pattern with no initializer in a for statement (issue 1301)
+
+2015-07-31: Version 2.5.0
+
+      * Run the test suite in a browser environment (issue 1004)
+      * Ensure a comma between imported default binding and named imports (issue 1046)
+      * Distinguish `yield` as a keyword vs an identifier (issue 1186)
+      * Support ES6 meta property `new.target` (issue 1203)
+      * Fix the syntax node for yield with expression (issue 1223)
+      * Fix the check of duplicated proto in property names (issue 1225)
+      * Fix ES6 Unicode escape in identifier name (issue 1229)
+      * Support ES6 IdentifierStart and IdentifierPart (issue 1232)
+      * Treat await as a reserved word when parsing as a module (issue 1234)
+      * Recognize identifier characters from Unicode SMP (issue 1244)
+      * Ensure that export and import can be followed by a comma (issue 1250)
+      * Fix yield operator precedence (issue 1262)
+
+2015-07-01: Version 2.4.1
+
+      * Fix some cases of comment attachment (issue 1071, 1175)
+      * Fix the handling of destructuring in function arguments (issue 1193)
+      * Fix invalid ranges in assignment expression (issue 1201)
+
+2015-06-26: Version 2.4.0
+
+      * Support ES6 for-of iteration (issue 1047)
+      * Support ES6 spread arguments (issue 1169)
+      * Minimize npm payload (issue 1191)
+
+2015-06-16: Version 2.3.0
+
+      * Support ES6 generator (issue 1033)
+      * Improve parsing of regular expressions with `u` flag (issue 1179)
+
+2015-04-17: Version 2.2.0
+
+      * Support ES6 import and export declarations (issue 1000)
+      * Fix line terminator before arrow not recognized as error (issue 1009)
+      * Support ES6 destructuring (issue 1045)
+      * Support ES6 template literal (issue 1074)
+      * Fix the handling of invalid/incomplete string escape sequences (issue 1106)
+      * Fix ES3 static member access restriction (issue 1120)
+      * Support for `super` in ES6 class (issue 1147)
+
+2015-03-09: Version 2.1.0
+
+      * Support ES6 class (issue 1001)
+      * Support ES6 rest parameter (issue 1011)
+      * Expand the location of property getter, setter, and methods (issue 1029)
+      * Enable TryStatement transition to a single handler (issue 1031)
+      * Support ES6 computed property name (issue 1037)
+      * Tolerate unclosed block comment (issue 1041)
+      * Support ES6 lexical declaration (issue 1065)
+
+2015-02-06: Version 2.0.0
+
+      * Support ES6 arrow function (issue 517)
+      * Support ES6 Unicode code point escape (issue 521)
+      * Improve the speed and accuracy of comment attachment (issue 522)
+      * Support ES6 default parameter (issue 519)
+      * Support ES6 regular expression flags (issue 557)
+      * Fix scanning of implicit octal literals (issue 565)
+      * Fix the handling of automatic semicolon insertion (issue 574)
+      * Support ES6 method definition (issue 620)
+      * Support ES6 octal integer literal (issue 621)
+      * Support ES6 binary integer literal (issue 622)
+      * Support ES6 object literal property value shorthand (issue 624)
+
+2015-03-03: Version 1.2.5
+
+      * Fix scanning of implicit octal literals (issue 565)
+
+2015-02-05: Version 1.2.4
+
+      * Fix parsing of LeftHandSideExpression in ForInStatement (issue 560)
+      * Fix the handling of automatic semicolon insertion (issue 574)
+
+2015-01-18: Version 1.2.3
+
+      * Fix division by this (issue 616)
+
+2014-05-18: Version 1.2.2
+
+      * Fix duplicated tokens when collecting comments (issue 537)
+
+2014-05-04: Version 1.2.1
+
+      * Ensure that Program node may still have leading comments (issue 536)
+
+2014-04-29: Version 1.2.0
+
+      * Fix semicolon handling for expression statement (issue 462, 533)
+      * Disallow escaped characters in regular expression flags (issue 503)
+      * Performance improvement for location tracking (issue 520)
+      * Improve the speed of comment attachment (issue 522)
+
+2014-03-26: Version 1.1.1
+
+      * Fix token handling of forward slash after an array literal (issue 512)
+
+2014-03-23: Version 1.1.0
+
+      * Optionally attach comments to the owning syntax nodes (issue 197)
+      * Simplify binary parsing with stack-based shift reduce (issue 352)
+      * Always include the raw source of literals (issue 376)
+      * Add optional input source information (issue 386)
+      * Tokenizer API for pure lexical scanning (issue 398)
+      * Improve the web site and its online demos (issue 337, 400, 404)
+      * Performance improvement for location tracking (issue 417, 424)
+      * Support HTML comment syntax (issue 451)
+      * Drop support for legacy browsers (issue 474)
+
+2013-08-27: Version 1.0.4
+
+      * Minimize the payload for packages (issue 362)
+      * Fix missing cases on an empty switch statement (issue 436)
+      * Support escaped ] in regexp literal character classes (issue 442)
+      * Tolerate invalid left-hand side expression (issue 130)
+
+2013-05-17: Version 1.0.3
+
+      * Variable declaration needs at least one declarator (issue 391)
+      * Fix benchmark's variance unit conversion (issue 397)
+      * IE < 9: \v should be treated as vertical tab (issue 405)
+      * Unary expressions should always have prefix: true (issue 418)
+      * Catch clause should only accept an identifier (issue 423)
+      * Tolerate setters without parameter (issue 426)
+
+2012-11-02: Version 1.0.2
+
+    Improvement:
+
+      * Fix esvalidate JUnit output upon a syntax error (issue 374)
+
+2012-10-28: Version 1.0.1
+
+    Improvements:
+
+      * esvalidate understands shebang in a Unix shell script (issue 361)
+      * esvalidate treats fatal parsing failure as an error (issue 361)
+      * Reduce Node.js package via .npmignore (issue 362)
+
+2012-10-22: Version 1.0.0
+
+    Initial release.
diff --git a/node_modules/svgo/node_modules/esprima/LICENSE.BSD b/node_modules/svgo/node_modules/esprima/LICENSE.BSD
new file mode 100644
index 00000000..17557ece
--- /dev/null
+++ b/node_modules/svgo/node_modules/esprima/LICENSE.BSD
@@ -0,0 +1,21 @@
+Copyright (c) jQuery Foundation, Inc. and Contributors, All Rights Reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+  * Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+  * Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/node_modules/svgo/node_modules/esprima/README.md b/node_modules/svgo/node_modules/esprima/README.md
new file mode 100644
index 00000000..749454f4
--- /dev/null
+++ b/node_modules/svgo/node_modules/esprima/README.md
@@ -0,0 +1,27 @@
+[![NPM version](https://img.shields.io/npm/v/esprima.svg)](https://www.npmjs.com/package/esprima)
+[![npm download](https://img.shields.io/npm/dm/esprima.svg)](https://www.npmjs.com/package/esprima)
+[![Build Status](https://img.shields.io/travis/jquery/esprima/master.svg)](https://travis-ci.org/jquery/esprima)
+[![Coverage Status](https://img.shields.io/codecov/c/github/jquery/esprima/master.svg)](https://codecov.io/github/jquery/esprima)
+
+**Esprima** ([esprima.org](http://esprima.org), BSD license) is a high performance,
+standard-compliant [ECMAScript](http://www.ecma-international.org/publications/standards/Ecma-262.htm)
+parser written in ECMAScript (also popularly known as
+[JavaScript](https://en.wikipedia.org/wiki/JavaScript)).
+Esprima is created and maintained by [Ariya Hidayat](https://twitter.com/ariyahidayat),
+with the help of [many contributors](https://github.com/jquery/esprima/contributors).
+
+### Features
+
+- Full support for ECMAScript 6 ([ECMA-262](http://www.ecma-international.org/publications/standards/Ecma-262.htm))
+- Sensible [syntax tree format](https://github.com/estree/estree/blob/master/spec.md) as standardized by [ESTree project](https://github.com/estree/estree)
+- Optional tracking of syntax node location (index-based and line-column)
+- [Heavily tested](http://esprima.org/test/ci.html) (~1250 [unit tests](https://github.com/jquery/esprima/tree/master/test/fixtures) with [full code coverage](https://codecov.io/github/jquery/esprima))
+
+Esprima serves as a **building block** for some JavaScript
+language tools, from [code instrumentation](http://esprima.org/demo/functiontrace.html)
+to [editor autocompletion](http://esprima.org/demo/autocomplete.html).
+
+Esprima runs on many popular web browsers, as well as other ECMAScript platforms such as
+[Rhino](http://www.mozilla.org/rhino), [Nashorn](http://openjdk.java.net/projects/nashorn/), and [Node.js](https://npmjs.org/package/esprima).
+
+For more information, check the web site [esprima.org](http://esprima.org).
diff --git a/node_modules/svgo/node_modules/esprima/bin/esparse.js b/node_modules/svgo/node_modules/esprima/bin/esparse.js
new file mode 100755
index 00000000..98bdbf48
--- /dev/null
+++ b/node_modules/svgo/node_modules/esprima/bin/esparse.js
@@ -0,0 +1,126 @@
+#!/usr/bin/env node
+/*
+  Copyright (c) jQuery Foundation, Inc. and Contributors, All Rights Reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/*jslint sloppy:true node:true rhino:true */
+
+var fs, esprima, fname, content, options, syntax;
+
+if (typeof require === 'function') {
+    fs = require('fs');
+    esprima = require('esprima');
+} else if (typeof load === 'function') {
+    try {
+        load('esprima.js');
+    } catch (e) {
+        load('../esprima.js');
+    }
+}
+
+// Shims to Node.js objects when running under Rhino.
+if (typeof console === 'undefined' && typeof process === 'undefined') {
+    console = { log: print };
+    fs = { readFileSync: readFile };
+    process = { argv: arguments, exit: quit };
+    process.argv.unshift('esparse.js');
+    process.argv.unshift('rhino');
+}
+
+function showUsage() {
+    console.log('Usage:');
+    console.log('   esparse [options] file.js');
+    console.log();
+    console.log('Available options:');
+    console.log();
+    console.log('  --comment      Gather all line and block comments in an array');
+    console.log('  --loc          Include line-column location info for each syntax node');
+    console.log('  --range        Include index-based range for each syntax node');
+    console.log('  --raw          Display the raw value of literals');
+    console.log('  --tokens       List all tokens in an array');
+    console.log('  --tolerant     Tolerate errors on a best-effort basis (experimental)');
+    console.log('  -v, --version  Shows program version');
+    console.log();
+    process.exit(1);
+}
+
+if (process.argv.length <= 2) {
+    showUsage();
+}
+
+options = {};
+
+process.argv.splice(2).forEach(function (entry) {
+
+    if (entry === '-h' || entry === '--help') {
+        showUsage();
+    } else if (entry === '-v' || entry === '--version') {
+        console.log('ECMAScript Parser (using Esprima version', esprima.version, ')');
+        console.log();
+        process.exit(0);
+    } else if (entry === '--comment') {
+        options.comment = true;
+    } else if (entry === '--loc') {
+        options.loc = true;
+    } else if (entry === '--range') {
+        options.range = true;
+    } else if (entry === '--raw') {
+        options.raw = true;
+    } else if (entry === '--tokens') {
+        options.tokens = true;
+    } else if (entry === '--tolerant') {
+        options.tolerant = true;
+    } else if (entry.slice(0, 2) === '--') {
+        console.log('Error: unknown option ' + entry + '.');
+        process.exit(1);
+    } else if (typeof fname === 'string') {
+        console.log('Error: more than one input file.');
+        process.exit(1);
+    } else {
+        fname = entry;
+    }
+});
+
+if (typeof fname !== 'string') {
+    console.log('Error: no input file.');
+    process.exit(1);
+}
+
+// Special handling for regular expression literal since we need to
+// convert it to a string literal, otherwise it will be decoded
+// as object "{}" and the regular expression would be lost.
+function adjustRegexLiteral(key, value) {
+    if (key === 'value' && value instanceof RegExp) {
+        value = value.toString();
+    }
+    return value;
+}
+
+try {
+    content = fs.readFileSync(fname, 'utf-8');
+    syntax = esprima.parse(content, options);
+    console.log(JSON.stringify(syntax, adjustRegexLiteral, 4));
+} catch (e) {
+    console.log('Error: ' + e.message);
+    process.exit(1);
+}
diff --git a/node_modules/svgo/node_modules/esprima/bin/esvalidate.js b/node_modules/svgo/node_modules/esprima/bin/esvalidate.js
new file mode 100755
index 00000000..f522dec2
--- /dev/null
+++ b/node_modules/svgo/node_modules/esprima/bin/esvalidate.js
@@ -0,0 +1,199 @@
+#!/usr/bin/env node
+/*
+  Copyright (c) jQuery Foundation, Inc. and Contributors, All Rights Reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/*jslint sloppy:true plusplus:true node:true rhino:true */
+/*global phantom:true */
+
+var fs, system, esprima, options, fnames, count;
+
+if (typeof esprima === 'undefined') {
+    // PhantomJS can only require() relative files
+    if (typeof phantom === 'object') {
+        fs = require('fs');
+        system = require('system');
+        esprima = require('./esprima');
+    } else if (typeof require === 'function') {
+        fs = require('fs');
+        esprima = require('esprima');
+    } else if (typeof load === 'function') {
+        try {
+            load('esprima.js');
+        } catch (e) {
+            load('../esprima.js');
+        }
+    }
+}
+
+// Shims to Node.js objects when running under PhantomJS 1.7+.
+if (typeof phantom === 'object') {
+    fs.readFileSync = fs.read;
+    process = {
+        argv: [].slice.call(system.args),
+        exit: phantom.exit
+    };
+    process.argv.unshift('phantomjs');
+}
+
+// Shims to Node.js objects when running under Rhino.
+if (typeof console === 'undefined' && typeof process === 'undefined') {
+    console = { log: print };
+    fs = { readFileSync: readFile };
+    process = { argv: arguments, exit: quit };
+    process.argv.unshift('esvalidate.js');
+    process.argv.unshift('rhino');
+}
+
+function showUsage() {
+    console.log('Usage:');
+    console.log('   esvalidate [options] file.js');
+    console.log();
+    console.log('Available options:');
+    console.log();
+    console.log('  --format=type  Set the report format, plain (default) or junit');
+    console.log('  -v, --version  Print program version');
+    console.log();
+    process.exit(1);
+}
+
+if (process.argv.length <= 2) {
+    showUsage();
+}
+
+options = {
+    format: 'plain'
+};
+
+fnames = [];
+
+process.argv.splice(2).forEach(function (entry) {
+
+    if (entry === '-h' || entry === '--help') {
+        showUsage();
+    } else if (entry === '-v' || entry === '--version') {
+        console.log('ECMAScript Validator (using Esprima version', esprima.version, ')');
+        console.log();
+        process.exit(0);
+    } else if (entry.slice(0, 9) === '--format=') {
+        options.format = entry.slice(9);
+        if (options.format !== 'plain' && options.format !== 'junit') {
+            console.log('Error: unknown report format ' + options.format + '.');
+            process.exit(1);
+        }
+    } else if (entry.slice(0, 2) === '--') {
+        console.log('Error: unknown option ' + entry + '.');
+        process.exit(1);
+    } else {
+        fnames.push(entry);
+    }
+});
+
+if (fnames.length === 0) {
+    console.log('Error: no input file.');
+    process.exit(1);
+}
+
+if (options.format === 'junit') {
+    console.log('<?xml version="1.0" encoding="UTF-8"?>');
+    console.log('<testsuites>');
+}
+
+count = 0;
+fnames.forEach(function (fname) {
+    var content, timestamp, syntax, name;
+    try {
+        content = fs.readFileSync(fname, 'utf-8');
+
+        if (content[0] === '#' && content[1] === '!') {
+            content = '//' + content.substr(2, content.length);
+        }
+
+        timestamp = Date.now();
+        syntax = esprima.parse(content, { tolerant: true });
+
+        if (options.format === 'junit') {
+
+            name = fname;
+            if (name.lastIndexOf('/') >= 0) {
+                name = name.slice(name.lastIndexOf('/') + 1);
+            }
+
+            console.log('<testsuite name="' + fname + '" errors="0" ' +
+                ' failures="' + syntax.errors.length + '" ' +
+                ' tests="' + syntax.errors.length + '" ' +
+                ' time="' + Math.round((Date.now() - timestamp) / 1000) +
+                '">');
+
+            syntax.errors.forEach(function (error) {
+                var msg = error.message;
+                msg = msg.replace(/^Line\ [0-9]*\:\ /, '');
+                console.log('  <testcase name="Line ' + error.lineNumber + ': ' + msg + '" ' +
+                    ' time="0">');
+                console.log('    <error type="SyntaxError" message="' + error.message + '">' +
+                    error.message + '(' + name + ':' + error.lineNumber + ')' +
+                    '</error>');
+                console.log('  </testcase>');
+            });
+
+            console.log('</testsuite>');
+
+        } else if (options.format === 'plain') {
+
+            syntax.errors.forEach(function (error) {
+                var msg = error.message;
+                msg = msg.replace(/^Line\ [0-9]*\:\ /, '');
+                msg = fname + ':' + error.lineNumber + ': ' + msg;
+                console.log(msg);
+                ++count;
+            });
+
+        }
+    } catch (e) {
+        ++count;
+        if (options.format === 'junit') {
+            console.log('<testsuite name="' + fname + '" errors="1" failures="0" tests="1" ' +
+                ' time="' + Math.round((Date.now() - timestamp) / 1000) + '">');
+            console.log(' <testcase name="' + e.message + '" ' + ' time="0">');
+            console.log(' <error type="ParseError" message="' + e.message + '">' +
+                e.message + '(' + fname + ((e.lineNumber) ? ':' + e.lineNumber : '') +
+                ')</error>');
+            console.log(' </testcase>');
+            console.log('</testsuite>');
+        } else {
+            console.log('Error: ' + e.message);
+        }
+    }
+});
+
+if (options.format === 'junit') {
+    console.log('</testsuites>');
+}
+
+if (count > 0) {
+    process.exit(1);
+}
+
+if (count === 0 && typeof phantom === 'object') {
+    process.exit(0);
+}
diff --git a/node_modules/svgo/node_modules/esprima/esprima.js b/node_modules/svgo/node_modules/esprima/esprima.js
new file mode 100644
index 00000000..0cb0a936
--- /dev/null
+++ b/node_modules/svgo/node_modules/esprima/esprima.js
@@ -0,0 +1,5740 @@
+/*
+  Copyright (c) jQuery Foundation, Inc. and Contributors, All Rights Reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+(function (root, factory) {
+    'use strict';
+
+    // Universal Module Definition (UMD) to support AMD, CommonJS/Node.js,
+    // Rhino, and plain browser loading.
+
+    /* istanbul ignore next */
+    if (typeof define === 'function' && define.amd) {
+        define(['exports'], factory);
+    } else if (typeof exports !== 'undefined') {
+        factory(exports);
+    } else {
+        factory((root.esprima = {}));
+    }
+}(this, function (exports) {
+    'use strict';
+
+    var Token,
+        TokenName,
+        FnExprTokens,
+        Syntax,
+        PlaceHolders,
+        Messages,
+        Regex,
+        source,
+        strict,
+        index,
+        lineNumber,
+        lineStart,
+        hasLineTerminator,
+        lastIndex,
+        lastLineNumber,
+        lastLineStart,
+        startIndex,
+        startLineNumber,
+        startLineStart,
+        scanning,
+        length,
+        lookahead,
+        state,
+        extra,
+        isBindingElement,
+        isAssignmentTarget,
+        firstCoverInitializedNameError;
+
+    Token = {
+        BooleanLiteral: 1,
+        EOF: 2,
+        Identifier: 3,
+        Keyword: 4,
+        NullLiteral: 5,
+        NumericLiteral: 6,
+        Punctuator: 7,
+        StringLiteral: 8,
+        RegularExpression: 9,
+        Template: 10
+    };
+
+    TokenName = {};
+    TokenName[Token.BooleanLiteral] = 'Boolean';
+    TokenName[Token.EOF] = '<end>';
+    TokenName[Token.Identifier] = 'Identifier';
+    TokenName[Token.Keyword] = 'Keyword';
+    TokenName[Token.NullLiteral] = 'Null';
+    TokenName[Token.NumericLiteral] = 'Numeric';
+    TokenName[Token.Punctuator] = 'Punctuator';
+    TokenName[Token.StringLiteral] = 'String';
+    TokenName[Token.RegularExpression] = 'RegularExpression';
+    TokenName[Token.Template] = 'Template';
+
+    // A function following one of those tokens is an expression.
+    FnExprTokens = ['(', '{', '[', 'in', 'typeof', 'instanceof', 'new',
+                    'return', 'case', 'delete', 'throw', 'void',
+                    // assignment operators
+                    '=', '+=', '-=', '*=', '/=', '%=', '<<=', '>>=', '>>>=',
+                    '&=', '|=', '^=', ',',
+                    // binary/unary operators
+                    '+', '-', '*', '/', '%', '++', '--', '<<', '>>', '>>>', '&',
+                    '|', '^', '!', '~', '&&', '||', '?', ':', '===', '==', '>=',
+                    '<=', '<', '>', '!=', '!=='];
+
+    Syntax = {
+        AssignmentExpression: 'AssignmentExpression',
+        AssignmentPattern: 'AssignmentPattern',
+        ArrayExpression: 'ArrayExpression',
+        ArrayPattern: 'ArrayPattern',
+        ArrowFunctionExpression: 'ArrowFunctionExpression',
+        BlockStatement: 'BlockStatement',
+        BinaryExpression: 'BinaryExpression',
+        BreakStatement: 'BreakStatement',
+        CallExpression: 'CallExpression',
+        CatchClause: 'CatchClause',
+        ClassBody: 'ClassBody',
+        ClassDeclaration: 'ClassDeclaration',
+        ClassExpression: 'ClassExpression',
+        ConditionalExpression: 'ConditionalExpression',
+        ContinueStatement: 'ContinueStatement',
+        DoWhileStatement: 'DoWhileStatement',
+        DebuggerStatement: 'DebuggerStatement',
+        EmptyStatement: 'EmptyStatement',
+        ExportAllDeclaration: 'ExportAllDeclaration',
+        ExportDefaultDeclaration: 'ExportDefaultDeclaration',
+        ExportNamedDeclaration: 'ExportNamedDeclaration',
+        ExportSpecifier: 'ExportSpecifier',
+        ExpressionStatement: 'ExpressionStatement',
+        ForStatement: 'ForStatement',
+        ForOfStatement: 'ForOfStatement',
+        ForInStatement: 'ForInStatement',
+        FunctionDeclaration: 'FunctionDeclaration',
+        FunctionExpression: 'FunctionExpression',
+        Identifier: 'Identifier',
+        IfStatement: 'IfStatement',
+        ImportDeclaration: 'ImportDeclaration',
+        ImportDefaultSpecifier: 'ImportDefaultSpecifier',
+        ImportNamespaceSpecifier: 'ImportNamespaceSpecifier',
+        ImportSpecifier: 'ImportSpecifier',
+        Literal: 'Literal',
+        LabeledStatement: 'LabeledStatement',
+        LogicalExpression: 'LogicalExpression',
+        MemberExpression: 'MemberExpression',
+        MetaProperty: 'MetaProperty',
+        MethodDefinition: 'MethodDefinition',
+        NewExpression: 'NewExpression',
+        ObjectExpression: 'ObjectExpression',
+        ObjectPattern: 'ObjectPattern',
+        Program: 'Program',
+        Property: 'Property',
+        RestElement: 'RestElement',
+        ReturnStatement: 'ReturnStatement',
+        SequenceExpression: 'SequenceExpression',
+        SpreadElement: 'SpreadElement',
+        Super: 'Super',
+        SwitchCase: 'SwitchCase',
+        SwitchStatement: 'SwitchStatement',
+        TaggedTemplateExpression: 'TaggedTemplateExpression',
+        TemplateElement: 'TemplateElement',
+        TemplateLiteral: 'TemplateLiteral',
+        ThisExpression: 'ThisExpression',
+        ThrowStatement: 'ThrowStatement',
+        TryStatement: 'TryStatement',
+        UnaryExpression: 'UnaryExpression',
+        UpdateExpression: 'UpdateExpression',
+        VariableDeclaration: 'VariableDeclaration',
+        VariableDeclarator: 'VariableDeclarator',
+        WhileStatement: 'WhileStatement',
+        WithStatement: 'WithStatement',
+        YieldExpression: 'YieldExpression'
+    };
+
+    PlaceHolders = {
+        ArrowParameterPlaceHolder: 'ArrowParameterPlaceHolder'
+    };
+
+    // Error messages should be identical to V8.
+    Messages = {
+        UnexpectedToken: 'Unexpected token %0',
+        UnexpectedNumber: 'Unexpected number',
+        UnexpectedString: 'Unexpected string',
+        UnexpectedIdentifier: 'Unexpected identifier',
+        UnexpectedReserved: 'Unexpected reserved word',
+        UnexpectedTemplate: 'Unexpected quasi %0',
+        UnexpectedEOS: 'Unexpected end of input',
+        NewlineAfterThrow: 'Illegal newline after throw',
+        InvalidRegExp: 'Invalid regular expression',
+        UnterminatedRegExp: 'Invalid regular expression: missing /',
+        InvalidLHSInAssignment: 'Invalid left-hand side in assignment',
+        InvalidLHSInForIn: 'Invalid left-hand side in for-in',
+        InvalidLHSInForLoop: 'Invalid left-hand side in for-loop',
+        MultipleDefaultsInSwitch: 'More than one default clause in switch statement',
+        NoCatchOrFinally: 'Missing catch or finally after try',
+        UnknownLabel: 'Undefined label \'%0\'',
+        Redeclaration: '%0 \'%1\' has already been declared',
+        IllegalContinue: 'Illegal continue statement',
+        IllegalBreak: 'Illegal break statement',
+        IllegalReturn: 'Illegal return statement',
+        StrictModeWith: 'Strict mode code may not include a with statement',
+        StrictCatchVariable: 'Catch variable may not be eval or arguments in strict mode',
+        StrictVarName: 'Variable name may not be eval or arguments in strict mode',
+        StrictParamName: 'Parameter name eval or arguments is not allowed in strict mode',
+        StrictParamDupe: 'Strict mode function may not have duplicate parameter names',
+        StrictFunctionName: 'Function name may not be eval or arguments in strict mode',
+        StrictOctalLiteral: 'Octal literals are not allowed in strict mode.',
+        StrictDelete: 'Delete of an unqualified identifier in strict mode.',
+        StrictLHSAssignment: 'Assignment to eval or arguments is not allowed in strict mode',
+        StrictLHSPostfix: 'Postfix increment/decrement may not have eval or arguments operand in strict mode',
+        StrictLHSPrefix: 'Prefix increment/decrement may not have eval or arguments operand in strict mode',
+        StrictReservedWord: 'Use of future reserved word in strict mode',
+        TemplateOctalLiteral: 'Octal literals are not allowed in template strings.',
+        ParameterAfterRestParameter: 'Rest parameter must be last formal parameter',
+        DefaultRestParameter: 'Unexpected token =',
+        ObjectPatternAsRestParameter: 'Unexpected token {',
+        DuplicateProtoProperty: 'Duplicate __proto__ fields are not allowed in object literals',
+        ConstructorSpecialMethod: 'Class constructor may not be an accessor',
+        DuplicateConstructor: 'A class may only have one constructor',
+        StaticPrototype: 'Classes may not have static property named prototype',
+        MissingFromClause: 'Unexpected token',
+        NoAsAfterImportNamespace: 'Unexpected token',
+        InvalidModuleSpecifier: 'Unexpected token',
+        IllegalImportDeclaration: 'Unexpected token',
+        IllegalExportDeclaration: 'Unexpected token',
+        DuplicateBinding: 'Duplicate binding %0'
+    };
+
+    // See also tools/generate-unicode-regex.js.
+    Regex = {
+        // ECMAScript 6/Unicode v7.0.0 NonAsciiIdentifierStart:
+        NonAsciiIdentifierStart: /[\xAA\xB5\xBA\xC0-\xD6\xD8-\xF6\xF8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377\u037A-\u037D\u037F\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u052F\u0531-\u0556\u0559\u0561-\u0587\u05D0-\u05EA\u05F0-\u05F2\u0620-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0840-\u0858\u08A0-\u08B2\u0904-\u0939\u093D\u0950\u0958-\u0961\u0971-\u0980\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BD\u09CE\u09DC\u09DD\u09DF-\u09E1\u09F0\u09F1\u0A05-\u0A0A\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39\u0A59-\u0A5C\u0A5E\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0\u0AE1\u0B05-\u0B0C\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3D\u0B5C\u0B5D\u0B5F-\u0B61\u0B71\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BD0\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C39\u0C3D\u0C58\u0C59\u0C60\u0C61\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBD\u0CDE\u0CE0\u0CE1\u0CF1\u0CF2\u0D05-\u0D0C\u0D0E-\u0D10\u0D12-\u0D3A\u0D3D\u0D4E\u0D60\u0D61\u0D7A-\u0D7F\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0E01-\u0E30\u0E32\u0E33\u0E40-\u0E46\u0E81\u0E82\u0E84\u0E87\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA\u0EAB\u0EAD-\u0EB0\u0EB2\u0EB3\u0EBD\u0EC0-\u0EC4\u0EC6\u0EDC-\u0EDF\u0F00\u0F40-\u0F47\u0F49-\u0F6C\u0F88-\u0F8C\u1000-\u102A\u103F\u1050-\u1055\u105A-\u105D\u1061\u1065\u1066\u106E-\u1070\u1075-\u1081\u108E\u10A0-\u10C5\u10C7\u10CD\u10D0-\u10FA\u10FC-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u1380-\u138F\u13A0-\u13F4\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u16EE-\u16F8\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7\u17DC\u1820-\u1877\u1880-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191E\u1950-\u196D\u1970-\u1974\u1980-\u19AB\u19C1-\u19C7\u1A00-\u1A16\u1A20-\u1A54\u1AA7\u1B05-\u1B33\u1B45-\u1B4B\u1B83-\u1BA0\u1BAE\u1BAF\u1BBA-\u1BE5\u1C00-\u1C23\u1C4D-\u1C4F\u1C5A-\u1C7D\u1CE9-\u1CEC\u1CEE-\u1CF1\u1CF5\u1CF6\u1D00-\u1DBF\u1E00-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2071\u207F\u2090-\u209C\u2102\u2107\u210A-\u2113\u2115\u2118-\u211D\u2124\u2126\u2128\u212A-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2160-\u2188\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CEE\u2CF2\u2CF3\u2D00-\u2D25\u2D27\u2D2D\u2D30-\u2D67\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303C\u3041-\u3096\u309B-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312D\u3131-\u318E\u31A0-\u31BA\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FCC\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA61F\uA62A\uA62B\uA640-\uA66E\uA67F-\uA69D\uA6A0-\uA6EF\uA717-\uA71F\uA722-\uA788\uA78B-\uA78E\uA790-\uA7AD\uA7B0\uA7B1\uA7F7-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uA840-\uA873\uA882-\uA8B3\uA8F2-\uA8F7\uA8FB\uA90A-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF\uA9E0-\uA9E4\uA9E6-\uA9EF\uA9FA-\uA9FE\uAA00-\uAA28\uAA40-\uAA42\uAA44-\uAA4B\uAA60-\uAA76\uAA7A\uAA7E-\uAAAF\uAAB1\uAAB5\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uAAE0-\uAAEA\uAAF2-\uAAF4\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uAB30-\uAB5A\uAB5C-\uAB5F\uAB64\uAB65\uABC0-\uABE2\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE70-\uFE74\uFE76-\uFEFC\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC]|\uD800[\uDC00-\uDC0B\uDC0D-\uDC26\uDC28-\uDC3A\uDC3C\uDC3D\uDC3F-\uDC4D\uDC50-\uDC5D\uDC80-\uDCFA\uDD40-\uDD74\uDE80-\uDE9C\uDEA0-\uDED0\uDF00-\uDF1F\uDF30-\uDF4A\uDF50-\uDF75\uDF80-\uDF9D\uDFA0-\uDFC3\uDFC8-\uDFCF\uDFD1-\uDFD5]|\uD801[\uDC00-\uDC9D\uDD00-\uDD27\uDD30-\uDD63\uDE00-\uDF36\uDF40-\uDF55\uDF60-\uDF67]|\uD802[\uDC00-\uDC05\uDC08\uDC0A-\uDC35\uDC37\uDC38\uDC3C\uDC3F-\uDC55\uDC60-\uDC76\uDC80-\uDC9E\uDD00-\uDD15\uDD20-\uDD39\uDD80-\uDDB7\uDDBE\uDDBF\uDE00\uDE10-\uDE13\uDE15-\uDE17\uDE19-\uDE33\uDE60-\uDE7C\uDE80-\uDE9C\uDEC0-\uDEC7\uDEC9-\uDEE4\uDF00-\uDF35\uDF40-\uDF55\uDF60-\uDF72\uDF80-\uDF91]|\uD803[\uDC00-\uDC48]|\uD804[\uDC03-\uDC37\uDC83-\uDCAF\uDCD0-\uDCE8\uDD03-\uDD26\uDD50-\uDD72\uDD76\uDD83-\uDDB2\uDDC1-\uDDC4\uDDDA\uDE00-\uDE11\uDE13-\uDE2B\uDEB0-\uDEDE\uDF05-\uDF0C\uDF0F\uDF10\uDF13-\uDF28\uDF2A-\uDF30\uDF32\uDF33\uDF35-\uDF39\uDF3D\uDF5D-\uDF61]|\uD805[\uDC80-\uDCAF\uDCC4\uDCC5\uDCC7\uDD80-\uDDAE\uDE00-\uDE2F\uDE44\uDE80-\uDEAA]|\uD806[\uDCA0-\uDCDF\uDCFF\uDEC0-\uDEF8]|\uD808[\uDC00-\uDF98]|\uD809[\uDC00-\uDC6E]|[\uD80C\uD840-\uD868\uD86A-\uD86C][\uDC00-\uDFFF]|\uD80D[\uDC00-\uDC2E]|\uD81A[\uDC00-\uDE38\uDE40-\uDE5E\uDED0-\uDEED\uDF00-\uDF2F\uDF40-\uDF43\uDF63-\uDF77\uDF7D-\uDF8F]|\uD81B[\uDF00-\uDF44\uDF50\uDF93-\uDF9F]|\uD82C[\uDC00\uDC01]|\uD82F[\uDC00-\uDC6A\uDC70-\uDC7C\uDC80-\uDC88\uDC90-\uDC99]|\uD835[\uDC00-\uDC54\uDC56-\uDC9C\uDC9E\uDC9F\uDCA2\uDCA5\uDCA6\uDCA9-\uDCAC\uDCAE-\uDCB9\uDCBB\uDCBD-\uDCC3\uDCC5-\uDD05\uDD07-\uDD0A\uDD0D-\uDD14\uDD16-\uDD1C\uDD1E-\uDD39\uDD3B-\uDD3E\uDD40-\uDD44\uDD46\uDD4A-\uDD50\uDD52-\uDEA5\uDEA8-\uDEC0\uDEC2-\uDEDA\uDEDC-\uDEFA\uDEFC-\uDF14\uDF16-\uDF34\uDF36-\uDF4E\uDF50-\uDF6E\uDF70-\uDF88\uDF8A-\uDFA8\uDFAA-\uDFC2\uDFC4-\uDFCB]|\uD83A[\uDC00-\uDCC4]|\uD83B[\uDE00-\uDE03\uDE05-\uDE1F\uDE21\uDE22\uDE24\uDE27\uDE29-\uDE32\uDE34-\uDE37\uDE39\uDE3B\uDE42\uDE47\uDE49\uDE4B\uDE4D-\uDE4F\uDE51\uDE52\uDE54\uDE57\uDE59\uDE5B\uDE5D\uDE5F\uDE61\uDE62\uDE64\uDE67-\uDE6A\uDE6C-\uDE72\uDE74-\uDE77\uDE79-\uDE7C\uDE7E\uDE80-\uDE89\uDE8B-\uDE9B\uDEA1-\uDEA3\uDEA5-\uDEA9\uDEAB-\uDEBB]|\uD869[\uDC00-\uDED6\uDF00-\uDFFF]|\uD86D[\uDC00-\uDF34\uDF40-\uDFFF]|\uD86E[\uDC00-\uDC1D]|\uD87E[\uDC00-\uDE1D]/,
+
+        // ECMAScript 6/Unicode v7.0.0 NonAsciiIdentifierPart:
+        NonAsciiIdentifierPart: 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uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC]|\uD800[\uDC00-\uDC0B\uDC0D-\uDC26\uDC28-\uDC3A\uDC3C\uDC3D\uDC3F-\uDC4D\uDC50-\uDC5D\uDC80-\uDCFA\uDD40-\uDD74\uDDFD\uDE80-\uDE9C\uDEA0-\uDED0\uDEE0\uDF00-\uDF1F\uDF30-\uDF4A\uDF50-\uDF7A\uDF80-\uDF9D\uDFA0-\uDFC3\uDFC8-\uDFCF\uDFD1-\uDFD5]|\uD801[\uDC00-\uDC9D\uDCA0-\uDCA9\uDD00-\uDD27\uDD30-\uDD63\uDE00-\uDF36\uDF40-\uDF55\uDF60-\uDF67]|\uD802[\uDC00-\uDC05\uDC08\uDC0A-\uDC35\uDC37\uDC38\uDC3C\uDC3F-\uDC55\uDC60-\uDC76\uDC80-\uDC9E\uDD00-\uDD15\uDD20-\uDD39\uDD80-\uDDB7\uDDBE\uDDBF\uDE00-\uDE03\uDE05\uDE06\uDE0C-\uDE13\uDE15-\uDE17\uDE19-\uDE33\uDE38-\uDE3A\uDE3F\uDE60-\uDE7C\uDE80-\uDE9C\uDEC0-\uDEC7\uDEC9-\uDEE6\uDF00-\uDF35\uDF40-\uDF55\uDF60-\uDF72\uDF80-\uDF91]|\uD803[\uDC00-\uDC48]|\uD804[\uDC00-\uDC46\uDC66-\uDC6F\uDC7F-\uDCBA\uDCD0-\uDCE8\uDCF0-\uDCF9\uDD00-\uDD34\uDD36-\uDD3F\uDD50-\uDD73\uDD76\uDD80-\uDDC4\uDDD0-\uDDDA\uDE00-\uDE11\uDE13-\uDE37\uDEB0-\uDEEA\uDEF0-\uDEF9\uDF01-\uDF03\uDF05-\uDF0C\uDF0F\uDF10\uDF13-\uDF28\uDF2A-\uDF30\uDF32\uDF33\uDF35-\uDF39\uDF3C-\uDF44\uDF47\uDF48\uDF4B-\uDF4D\uDF57\uDF5D-\uDF63\uDF66-\uDF6C\uDF70-\uDF74]|\uD805[\uDC80-\uDCC5\uDCC7\uDCD0-\uDCD9\uDD80-\uDDB5\uDDB8-\uDDC0\uDE00-\uDE40\uDE44\uDE50-\uDE59\uDE80-\uDEB7\uDEC0-\uDEC9]|\uD806[\uDCA0-\uDCE9\uDCFF\uDEC0-\uDEF8]|\uD808[\uDC00-\uDF98]|\uD809[\uDC00-\uDC6E]|[\uD80C\uD840-\uD868\uD86A-\uD86C][\uDC00-\uDFFF]|\uD80D[\uDC00-\uDC2E]|\uD81A[\uDC00-\uDE38\uDE40-\uDE5E\uDE60-\uDE69\uDED0-\uDEED\uDEF0-\uDEF4\uDF00-\uDF36\uDF40-\uDF43\uDF50-\uDF59\uDF63-\uDF77\uDF7D-\uDF8F]|\uD81B[\uDF00-\uDF44\uDF50-\uDF7E\uDF8F-\uDF9F]|\uD82C[\uDC00\uDC01]|\uD82F[\uDC00-\uDC6A\uDC70-\uDC7C\uDC80-\uDC88\uDC90-\uDC99\uDC9D\uDC9E]|\uD834[\uDD65-\uDD69\uDD6D-\uDD72\uDD7B-\uDD82\uDD85-\uDD8B\uDDAA-\uDDAD\uDE42-\uDE44]|\uD835[\uDC00-\uDC54\uDC56-\uDC9C\uDC9E\uDC9F\uDCA2\uDCA5\uDCA6\uDCA9-\uDCAC\uDCAE-\uDCB9\uDCBB\uDCBD-\uDCC3\uDCC5-\uDD05\uDD07-\uDD0A\uDD0D-\uDD14\uDD16-\uDD1C\uDD1E-\uDD39\uDD3B-\uDD3E\uDD40-\uDD44\uDD46\uDD4A-\uDD50\uDD52-\uDEA5\uDEA8-\uDEC0\uDEC2-\uDEDA\uDEDC-\uDEFA\uDEFC-\uDF14\uDF16-\uDF34\uDF36-\uDF4E\uDF50-\uDF6E\uDF70-\uDF88\uDF8A-\uDFA8\uDFAA-\uDFC2\uDFC4-\uDFCB\uDFCE-\uDFFF]|\uD83A[\uDC00-\uDCC4\uDCD0-\uDCD6]|\uD83B[\uDE00-\uDE03\uDE05-\uDE1F\uDE21\uDE22\uDE24\uDE27\uDE29-\uDE32\uDE34-\uDE37\uDE39\uDE3B\uDE42\uDE47\uDE49\uDE4B\uDE4D-\uDE4F\uDE51\uDE52\uDE54\uDE57\uDE59\uDE5B\uDE5D\uDE5F\uDE61\uDE62\uDE64\uDE67-\uDE6A\uDE6C-\uDE72\uDE74-\uDE77\uDE79-\uDE7C\uDE7E\uDE80-\uDE89\uDE8B-\uDE9B\uDEA1-\uDEA3\uDEA5-\uDEA9\uDEAB-\uDEBB]|\uD869[\uDC00-\uDED6\uDF00-\uDFFF]|\uD86D[\uDC00-\uDF34\uDF40-\uDFFF]|\uD86E[\uDC00-\uDC1D]|\uD87E[\uDC00-\uDE1D]|\uDB40[\uDD00-\uDDEF]/
+    };
+
+    // Ensure the condition is true, otherwise throw an error.
+    // This is only to have a better contract semantic, i.e. another safety net
+    // to catch a logic error. The condition shall be fulfilled in normal case.
+    // Do NOT use this to enforce a certain condition on any user input.
+
+    function assert(condition, message) {
+        /* istanbul ignore if */
+        if (!condition) {
+            throw new Error('ASSERT: ' + message);
+        }
+    }
+
+    function isDecimalDigit(ch) {
+        return (ch >= 0x30 && ch <= 0x39);   // 0..9
+    }
+
+    function isHexDigit(ch) {
+        return '0123456789abcdefABCDEF'.indexOf(ch) >= 0;
+    }
+
+    function isOctalDigit(ch) {
+        return '01234567'.indexOf(ch) >= 0;
+    }
+
+    function octalToDecimal(ch) {
+        // \0 is not octal escape sequence
+        var octal = (ch !== '0'), code = '01234567'.indexOf(ch);
+
+        if (index < length && isOctalDigit(source[index])) {
+            octal = true;
+            code = code * 8 + '01234567'.indexOf(source[index++]);
+
+            // 3 digits are only allowed when string starts
+            // with 0, 1, 2, 3
+            if ('0123'.indexOf(ch) >= 0 &&
+                    index < length &&
+                    isOctalDigit(source[index])) {
+                code = code * 8 + '01234567'.indexOf(source[index++]);
+            }
+        }
+
+        return {
+            code: code,
+            octal: octal
+        };
+    }
+
+    // ECMA-262 11.2 White Space
+
+    function isWhiteSpace(ch) {
+        return (ch === 0x20) || (ch === 0x09) || (ch === 0x0B) || (ch === 0x0C) || (ch === 0xA0) ||
+            (ch >= 0x1680 && [0x1680, 0x180E, 0x2000, 0x2001, 0x2002, 0x2003, 0x2004, 0x2005, 0x2006, 0x2007, 0x2008, 0x2009, 0x200A, 0x202F, 0x205F, 0x3000, 0xFEFF].indexOf(ch) >= 0);
+    }
+
+    // ECMA-262 11.3 Line Terminators
+
+    function isLineTerminator(ch) {
+        return (ch === 0x0A) || (ch === 0x0D) || (ch === 0x2028) || (ch === 0x2029);
+    }
+
+    // ECMA-262 11.6 Identifier Names and Identifiers
+
+    function fromCodePoint(cp) {
+        return (cp < 0x10000) ? String.fromCharCode(cp) :
+            String.fromCharCode(0xD800 + ((cp - 0x10000) >> 10)) +
+            String.fromCharCode(0xDC00 + ((cp - 0x10000) & 1023));
+    }
+
+    function isIdentifierStart(ch) {
+        return (ch === 0x24) || (ch === 0x5F) ||  // $ (dollar) and _ (underscore)
+            (ch >= 0x41 && ch <= 0x5A) ||         // A..Z
+            (ch >= 0x61 && ch <= 0x7A) ||         // a..z
+            (ch === 0x5C) ||                      // \ (backslash)
+            ((ch >= 0x80) && Regex.NonAsciiIdentifierStart.test(fromCodePoint(ch)));
+    }
+
+    function isIdentifierPart(ch) {
+        return (ch === 0x24) || (ch === 0x5F) ||  // $ (dollar) and _ (underscore)
+            (ch >= 0x41 && ch <= 0x5A) ||         // A..Z
+            (ch >= 0x61 && ch <= 0x7A) ||         // a..z
+            (ch >= 0x30 && ch <= 0x39) ||         // 0..9
+            (ch === 0x5C) ||                      // \ (backslash)
+            ((ch >= 0x80) && Regex.NonAsciiIdentifierPart.test(fromCodePoint(ch)));
+    }
+
+    // ECMA-262 11.6.2.2 Future Reserved Words
+
+    function isFutureReservedWord(id) {
+        switch (id) {
+        case 'enum':
+        case 'export':
+        case 'import':
+        case 'super':
+            return true;
+        default:
+            return false;
+        }
+    }
+
+    function isStrictModeReservedWord(id) {
+        switch (id) {
+        case 'implements':
+        case 'interface':
+        case 'package':
+        case 'private':
+        case 'protected':
+        case 'public':
+        case 'static':
+        case 'yield':
+        case 'let':
+            return true;
+        default:
+            return false;
+        }
+    }
+
+    function isRestrictedWord(id) {
+        return id === 'eval' || id === 'arguments';
+    }
+
+    // ECMA-262 11.6.2.1 Keywords
+
+    function isKeyword(id) {
+        switch (id.length) {
+        case 2:
+            return (id === 'if') || (id === 'in') || (id === 'do');
+        case 3:
+            return (id === 'var') || (id === 'for') || (id === 'new') ||
+                (id === 'try') || (id === 'let');
+        case 4:
+            return (id === 'this') || (id === 'else') || (id === 'case') ||
+                (id === 'void') || (id === 'with') || (id === 'enum');
+        case 5:
+            return (id === 'while') || (id === 'break') || (id === 'catch') ||
+                (id === 'throw') || (id === 'const') || (id === 'yield') ||
+                (id === 'class') || (id === 'super');
+        case 6:
+            return (id === 'return') || (id === 'typeof') || (id === 'delete') ||
+                (id === 'switch') || (id === 'export') || (id === 'import');
+        case 7:
+            return (id === 'default') || (id === 'finally') || (id === 'extends');
+        case 8:
+            return (id === 'function') || (id === 'continue') || (id === 'debugger');
+        case 10:
+            return (id === 'instanceof');
+        default:
+            return false;
+        }
+    }
+
+    // ECMA-262 11.4 Comments
+
+    function addComment(type, value, start, end, loc) {
+        var comment;
+
+        assert(typeof start === 'number', 'Comment must have valid position');
+
+        state.lastCommentStart = start;
+
+        comment = {
+            type: type,
+            value: value
+        };
+        if (extra.range) {
+            comment.range = [start, end];
+        }
+        if (extra.loc) {
+            comment.loc = loc;
+        }
+        extra.comments.push(comment);
+        if (extra.attachComment) {
+            extra.leadingComments.push(comment);
+            extra.trailingComments.push(comment);
+        }
+        if (extra.tokenize) {
+            comment.type = comment.type + 'Comment';
+            if (extra.delegate) {
+                comment = extra.delegate(comment);
+            }
+            extra.tokens.push(comment);
+        }
+    }
+
+    function skipSingleLineComment(offset) {
+        var start, loc, ch, comment;
+
+        start = index - offset;
+        loc = {
+            start: {
+                line: lineNumber,
+                column: index - lineStart - offset
+            }
+        };
+
+        while (index < length) {
+            ch = source.charCodeAt(index);
+            ++index;
+            if (isLineTerminator(ch)) {
+                hasLineTerminator = true;
+                if (extra.comments) {
+                    comment = source.slice(start + offset, index - 1);
+                    loc.end = {
+                        line: lineNumber,
+                        column: index - lineStart - 1
+                    };
+                    addComment('Line', comment, start, index - 1, loc);
+                }
+                if (ch === 13 && source.charCodeAt(index) === 10) {
+                    ++index;
+                }
+                ++lineNumber;
+                lineStart = index;
+                return;
+            }
+        }
+
+        if (extra.comments) {
+            comment = source.slice(start + offset, index);
+            loc.end = {
+                line: lineNumber,
+                column: index - lineStart
+            };
+            addComment('Line', comment, start, index, loc);
+        }
+    }
+
+    function skipMultiLineComment() {
+        var start, loc, ch, comment;
+
+        if (extra.comments) {
+            start = index - 2;
+            loc = {
+                start: {
+                    line: lineNumber,
+                    column: index - lineStart - 2
+                }
+            };
+        }
+
+        while (index < length) {
+            ch = source.charCodeAt(index);
+            if (isLineTerminator(ch)) {
+                if (ch === 0x0D && source.charCodeAt(index + 1) === 0x0A) {
+                    ++index;
+                }
+                hasLineTerminator = true;
+                ++lineNumber;
+                ++index;
+                lineStart = index;
+            } else if (ch === 0x2A) {
+                // Block comment ends with '*/'.
+                if (source.charCodeAt(index + 1) === 0x2F) {
+                    ++index;
+                    ++index;
+                    if (extra.comments) {
+                        comment = source.slice(start + 2, index - 2);
+                        loc.end = {
+                            line: lineNumber,
+                            column: index - lineStart
+                        };
+                        addComment('Block', comment, start, index, loc);
+                    }
+                    return;
+                }
+                ++index;
+            } else {
+                ++index;
+            }
+        }
+
+        // Ran off the end of the file - the whole thing is a comment
+        if (extra.comments) {
+            loc.end = {
+                line: lineNumber,
+                column: index - lineStart
+            };
+            comment = source.slice(start + 2, index);
+            addComment('Block', comment, start, index, loc);
+        }
+        tolerateUnexpectedToken();
+    }
+
+    function skipComment() {
+        var ch, start;
+        hasLineTerminator = false;
+
+        start = (index === 0);
+        while (index < length) {
+            ch = source.charCodeAt(index);
+
+            if (isWhiteSpace(ch)) {
+                ++index;
+            } else if (isLineTerminator(ch)) {
+                hasLineTerminator = true;
+                ++index;
+                if (ch === 0x0D && source.charCodeAt(index) === 0x0A) {
+                    ++index;
+                }
+                ++lineNumber;
+                lineStart = index;
+                start = true;
+            } else if (ch === 0x2F) { // U+002F is '/'
+                ch = source.charCodeAt(index + 1);
+                if (ch === 0x2F) {
+                    ++index;
+                    ++index;
+                    skipSingleLineComment(2);
+                    start = true;
+                } else if (ch === 0x2A) {  // U+002A is '*'
+                    ++index;
+                    ++index;
+                    skipMultiLineComment();
+                } else {
+                    break;
+                }
+            } else if (start && ch === 0x2D) { // U+002D is '-'
+                // U+003E is '>'
+                if ((source.charCodeAt(index + 1) === 0x2D) && (source.charCodeAt(index + 2) === 0x3E)) {
+                    // '-->' is a single-line comment
+                    index += 3;
+                    skipSingleLineComment(3);
+                } else {
+                    break;
+                }
+            } else if (ch === 0x3C) { // U+003C is '<'
+                if (source.slice(index + 1, index + 4) === '!--') {
+                    ++index; // `<`
+                    ++index; // `!`
+                    ++index; // `-`
+                    ++index; // `-`
+                    skipSingleLineComment(4);
+                } else {
+                    break;
+                }
+            } else {
+                break;
+            }
+        }
+    }
+
+    function scanHexEscape(prefix) {
+        var i, len, ch, code = 0;
+
+        len = (prefix === 'u') ? 4 : 2;
+        for (i = 0; i < len; ++i) {
+            if (index < length && isHexDigit(source[index])) {
+                ch = source[index++];
+                code = code * 16 + '0123456789abcdef'.indexOf(ch.toLowerCase());
+            } else {
+                return '';
+            }
+        }
+        return String.fromCharCode(code);
+    }
+
+    function scanUnicodeCodePointEscape() {
+        var ch, code;
+
+        ch = source[index];
+        code = 0;
+
+        // At least, one hex digit is required.
+        if (ch === '}') {
+            throwUnexpectedToken();
+        }
+
+        while (index < length) {
+            ch = source[index++];
+            if (!isHexDigit(ch)) {
+                break;
+            }
+            code = code * 16 + '0123456789abcdef'.indexOf(ch.toLowerCase());
+        }
+
+        if (code > 0x10FFFF || ch !== '}') {
+            throwUnexpectedToken();
+        }
+
+        return fromCodePoint(code);
+    }
+
+    function codePointAt(i) {
+        var cp, first, second;
+
+        cp = source.charCodeAt(i);
+        if (cp >= 0xD800 && cp <= 0xDBFF) {
+            second = source.charCodeAt(i + 1);
+            if (second >= 0xDC00 && second <= 0xDFFF) {
+                first = cp;
+                cp = (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
+            }
+        }
+
+        return cp;
+    }
+
+    function getComplexIdentifier() {
+        var cp, ch, id;
+
+        cp = codePointAt(index);
+        id = fromCodePoint(cp);
+        index += id.length;
+
+        // '\u' (U+005C, U+0075) denotes an escaped character.
+        if (cp === 0x5C) {
+            if (source.charCodeAt(index) !== 0x75) {
+                throwUnexpectedToken();
+            }
+            ++index;
+            if (source[index] === '{') {
+                ++index;
+                ch = scanUnicodeCodePointEscape();
+            } else {
+                ch = scanHexEscape('u');
+                cp = ch.charCodeAt(0);
+                if (!ch || ch === '\\' || !isIdentifierStart(cp)) {
+                    throwUnexpectedToken();
+                }
+            }
+            id = ch;
+        }
+
+        while (index < length) {
+            cp = codePointAt(index);
+            if (!isIdentifierPart(cp)) {
+                break;
+            }
+            ch = fromCodePoint(cp);
+            id += ch;
+            index += ch.length;
+
+            // '\u' (U+005C, U+0075) denotes an escaped character.
+            if (cp === 0x5C) {
+                id = id.substr(0, id.length - 1);
+                if (source.charCodeAt(index) !== 0x75) {
+                    throwUnexpectedToken();
+                }
+                ++index;
+                if (source[index] === '{') {
+                    ++index;
+                    ch = scanUnicodeCodePointEscape();
+                } else {
+                    ch = scanHexEscape('u');
+                    cp = ch.charCodeAt(0);
+                    if (!ch || ch === '\\' || !isIdentifierPart(cp)) {
+                        throwUnexpectedToken();
+                    }
+                }
+                id += ch;
+            }
+        }
+
+        return id;
+    }
+
+    function getIdentifier() {
+        var start, ch;
+
+        start = index++;
+        while (index < length) {
+            ch = source.charCodeAt(index);
+            if (ch === 0x5C) {
+                // Blackslash (U+005C) marks Unicode escape sequence.
+                index = start;
+                return getComplexIdentifier();
+            } else if (ch >= 0xD800 && ch < 0xDFFF) {
+                // Need to handle surrogate pairs.
+                index = start;
+                return getComplexIdentifier();
+            }
+            if (isIdentifierPart(ch)) {
+                ++index;
+            } else {
+                break;
+            }
+        }
+
+        return source.slice(start, index);
+    }
+
+    function scanIdentifier() {
+        var start, id, type;
+
+        start = index;
+
+        // Backslash (U+005C) starts an escaped character.
+        id = (source.charCodeAt(index) === 0x5C) ? getComplexIdentifier() : getIdentifier();
+
+        // There is no keyword or literal with only one character.
+        // Thus, it must be an identifier.
+        if (id.length === 1) {
+            type = Token.Identifier;
+        } else if (isKeyword(id)) {
+            type = Token.Keyword;
+        } else if (id === 'null') {
+            type = Token.NullLiteral;
+        } else if (id === 'true' || id === 'false') {
+            type = Token.BooleanLiteral;
+        } else {
+            type = Token.Identifier;
+        }
+
+        return {
+            type: type,
+            value: id,
+            lineNumber: lineNumber,
+            lineStart: lineStart,
+            start: start,
+            end: index
+        };
+    }
+
+
+    // ECMA-262 11.7 Punctuators
+
+    function scanPunctuator() {
+        var token, str;
+
+        token = {
+            type: Token.Punctuator,
+            value: '',
+            lineNumber: lineNumber,
+            lineStart: lineStart,
+            start: index,
+            end: index
+        };
+
+        // Check for most common single-character punctuators.
+        str = source[index];
+        switch (str) {
+
+        case '(':
+            if (extra.tokenize) {
+                extra.openParenToken = extra.tokenValues.length;
+            }
+            ++index;
+            break;
+
+        case '{':
+            if (extra.tokenize) {
+                extra.openCurlyToken = extra.tokenValues.length;
+            }
+            state.curlyStack.push('{');
+            ++index;
+            break;
+
+        case '.':
+            ++index;
+            if (source[index] === '.' && source[index + 1] === '.') {
+                // Spread operator: ...
+                index += 2;
+                str = '...';
+            }
+            break;
+
+        case '}':
+            ++index;
+            state.curlyStack.pop();
+            break;
+        case ')':
+        case ';':
+        case ',':
+        case '[':
+        case ']':
+        case ':':
+        case '?':
+        case '~':
+            ++index;
+            break;
+
+        default:
+            // 4-character punctuator.
+            str = source.substr(index, 4);
+            if (str === '>>>=') {
+                index += 4;
+            } else {
+
+                // 3-character punctuators.
+                str = str.substr(0, 3);
+                if (str === '===' || str === '!==' || str === '>>>' ||
+                    str === '<<=' || str === '>>=') {
+                    index += 3;
+                } else {
+
+                    // 2-character punctuators.
+                    str = str.substr(0, 2);
+                    if (str === '&&' || str === '||' || str === '==' || str === '!=' ||
+                        str === '+=' || str === '-=' || str === '*=' || str === '/=' ||
+                        str === '++' || str === '--' || str === '<<' || str === '>>' ||
+                        str === '&=' || str === '|=' || str === '^=' || str === '%=' ||
+                        str === '<=' || str === '>=' || str === '=>') {
+                        index += 2;
+                    } else {
+
+                        // 1-character punctuators.
+                        str = source[index];
+                        if ('<>=!+-*%&|^/'.indexOf(str) >= 0) {
+                            ++index;
+                        }
+                    }
+                }
+            }
+        }
+
+        if (index === token.start) {
+            throwUnexpectedToken();
+        }
+
+        token.end = index;
+        token.value = str;
+        return token;
+    }
+
+    // ECMA-262 11.8.3 Numeric Literals
+
+    function scanHexLiteral(start) {
+        var number = '';
+
+        while (index < length) {
+            if (!isHexDigit(source[index])) {
+                break;
+            }
+            number += source[index++];
+        }
+
+        if (number.length === 0) {
+            throwUnexpectedToken();
+        }
+
+        if (isIdentifierStart(source.charCodeAt(index))) {
+            throwUnexpectedToken();
+        }
+
+        return {
+            type: Token.NumericLiteral,
+            value: parseInt('0x' + number, 16),
+            lineNumber: lineNumber,
+            lineStart: lineStart,
+            start: start,
+            end: index
+        };
+    }
+
+    function scanBinaryLiteral(start) {
+        var ch, number;
+
+        number = '';
+
+        while (index < length) {
+            ch = source[index];
+            if (ch !== '0' && ch !== '1') {
+                break;
+            }
+            number += source[index++];
+        }
+
+        if (number.length === 0) {
+            // only 0b or 0B
+            throwUnexpectedToken();
+        }
+
+        if (index < length) {
+            ch = source.charCodeAt(index);
+            /* istanbul ignore else */
+            if (isIdentifierStart(ch) || isDecimalDigit(ch)) {
+                throwUnexpectedToken();
+            }
+        }
+
+        return {
+            type: Token.NumericLiteral,
+            value: parseInt(number, 2),
+            lineNumber: lineNumber,
+            lineStart: lineStart,
+            start: start,
+            end: index
+        };
+    }
+
+    function scanOctalLiteral(prefix, start) {
+        var number, octal;
+
+        if (isOctalDigit(prefix)) {
+            octal = true;
+            number = '0' + source[index++];
+        } else {
+            octal = false;
+            ++index;
+            number = '';
+        }
+
+        while (index < length) {
+            if (!isOctalDigit(source[index])) {
+                break;
+            }
+            number += source[index++];
+        }
+
+        if (!octal && number.length === 0) {
+            // only 0o or 0O
+            throwUnexpectedToken();
+        }
+
+        if (isIdentifierStart(source.charCodeAt(index)) || isDecimalDigit(source.charCodeAt(index))) {
+            throwUnexpectedToken();
+        }
+
+        return {
+            type: Token.NumericLiteral,
+            value: parseInt(number, 8),
+            octal: octal,
+            lineNumber: lineNumber,
+            lineStart: lineStart,
+            start: start,
+            end: index
+        };
+    }
+
+    function isImplicitOctalLiteral() {
+        var i, ch;
+
+        // Implicit octal, unless there is a non-octal digit.
+        // (Annex B.1.1 on Numeric Literals)
+        for (i = index + 1; i < length; ++i) {
+            ch = source[i];
+            if (ch === '8' || ch === '9') {
+                return false;
+            }
+            if (!isOctalDigit(ch)) {
+                return true;
+            }
+        }
+
+        return true;
+    }
+
+    function scanNumericLiteral() {
+        var number, start, ch;
+
+        ch = source[index];
+        assert(isDecimalDigit(ch.charCodeAt(0)) || (ch === '.'),
+            'Numeric literal must start with a decimal digit or a decimal point');
+
+        start = index;
+        number = '';
+        if (ch !== '.') {
+            number = source[index++];
+            ch = source[index];
+
+            // Hex number starts with '0x'.
+            // Octal number starts with '0'.
+            // Octal number in ES6 starts with '0o'.
+            // Binary number in ES6 starts with '0b'.
+            if (number === '0') {
+                if (ch === 'x' || ch === 'X') {
+                    ++index;
+                    return scanHexLiteral(start);
+                }
+                if (ch === 'b' || ch === 'B') {
+                    ++index;
+                    return scanBinaryLiteral(start);
+                }
+                if (ch === 'o' || ch === 'O') {
+                    return scanOctalLiteral(ch, start);
+                }
+
+                if (isOctalDigit(ch)) {
+                    if (isImplicitOctalLiteral()) {
+                        return scanOctalLiteral(ch, start);
+                    }
+                }
+            }
+
+            while (isDecimalDigit(source.charCodeAt(index))) {
+                number += source[index++];
+            }
+            ch = source[index];
+        }
+
+        if (ch === '.') {
+            number += source[index++];
+            while (isDecimalDigit(source.charCodeAt(index))) {
+                number += source[index++];
+            }
+            ch = source[index];
+        }
+
+        if (ch === 'e' || ch === 'E') {
+            number += source[index++];
+
+            ch = source[index];
+            if (ch === '+' || ch === '-') {
+                number += source[index++];
+            }
+            if (isDecimalDigit(source.charCodeAt(index))) {
+                while (isDecimalDigit(source.charCodeAt(index))) {
+                    number += source[index++];
+                }
+            } else {
+                throwUnexpectedToken();
+            }
+        }
+
+        if (isIdentifierStart(source.charCodeAt(index))) {
+            throwUnexpectedToken();
+        }
+
+        return {
+            type: Token.NumericLiteral,
+            value: parseFloat(number),
+            lineNumber: lineNumber,
+            lineStart: lineStart,
+            start: start,
+            end: index
+        };
+    }
+
+    // ECMA-262 11.8.4 String Literals
+
+    function scanStringLiteral() {
+        var str = '', quote, start, ch, unescaped, octToDec, octal = false;
+
+        quote = source[index];
+        assert((quote === '\'' || quote === '"'),
+            'String literal must starts with a quote');
+
+        start = index;
+        ++index;
+
+        while (index < length) {
+            ch = source[index++];
+
+            if (ch === quote) {
+                quote = '';
+                break;
+            } else if (ch === '\\') {
+                ch = source[index++];
+                if (!ch || !isLineTerminator(ch.charCodeAt(0))) {
+                    switch (ch) {
+                    case 'u':
+                    case 'x':
+                        if (source[index] === '{') {
+                            ++index;
+                            str += scanUnicodeCodePointEscape();
+                        } else {
+                            unescaped = scanHexEscape(ch);
+                            if (!unescaped) {
+                                throw throwUnexpectedToken();
+                            }
+                            str += unescaped;
+                        }
+                        break;
+                    case 'n':
+                        str += '\n';
+                        break;
+                    case 'r':
+                        str += '\r';
+                        break;
+                    case 't':
+                        str += '\t';
+                        break;
+                    case 'b':
+                        str += '\b';
+                        break;
+                    case 'f':
+                        str += '\f';
+                        break;
+                    case 'v':
+                        str += '\x0B';
+                        break;
+                    case '8':
+                    case '9':
+                        str += ch;
+                        tolerateUnexpectedToken();
+                        break;
+
+                    default:
+                        if (isOctalDigit(ch)) {
+                            octToDec = octalToDecimal(ch);
+
+                            octal = octToDec.octal || octal;
+                            str += String.fromCharCode(octToDec.code);
+                        } else {
+                            str += ch;
+                        }
+                        break;
+                    }
+                } else {
+                    ++lineNumber;
+                    if (ch === '\r' && source[index] === '\n') {
+                        ++index;
+                    }
+                    lineStart = index;
+                }
+            } else if (isLineTerminator(ch.charCodeAt(0))) {
+                break;
+            } else {
+                str += ch;
+            }
+        }
+
+        if (quote !== '') {
+            index = start;
+            throwUnexpectedToken();
+        }
+
+        return {
+            type: Token.StringLiteral,
+            value: str,
+            octal: octal,
+            lineNumber: startLineNumber,
+            lineStart: startLineStart,
+            start: start,
+            end: index
+        };
+    }
+
+    // ECMA-262 11.8.6 Template Literal Lexical Components
+
+    function scanTemplate() {
+        var cooked = '', ch, start, rawOffset, terminated, head, tail, restore, unescaped;
+
+        terminated = false;
+        tail = false;
+        start = index;
+        head = (source[index] === '`');
+        rawOffset = 2;
+
+        ++index;
+
+        while (index < length) {
+            ch = source[index++];
+            if (ch === '`') {
+                rawOffset = 1;
+                tail = true;
+                terminated = true;
+                break;
+            } else if (ch === '$') {
+                if (source[index] === '{') {
+                    state.curlyStack.push('${');
+                    ++index;
+                    terminated = true;
+                    break;
+                }
+                cooked += ch;
+            } else if (ch === '\\') {
+                ch = source[index++];
+                if (!isLineTerminator(ch.charCodeAt(0))) {
+                    switch (ch) {
+                    case 'n':
+                        cooked += '\n';
+                        break;
+                    case 'r':
+                        cooked += '\r';
+                        break;
+                    case 't':
+                        cooked += '\t';
+                        break;
+                    case 'u':
+                    case 'x':
+                        if (source[index] === '{') {
+                            ++index;
+                            cooked += scanUnicodeCodePointEscape();
+                        } else {
+                            restore = index;
+                            unescaped = scanHexEscape(ch);
+                            if (unescaped) {
+                                cooked += unescaped;
+                            } else {
+                                index = restore;
+                                cooked += ch;
+                            }
+                        }
+                        break;
+                    case 'b':
+                        cooked += '\b';
+                        break;
+                    case 'f':
+                        cooked += '\f';
+                        break;
+                    case 'v':
+                        cooked += '\v';
+                        break;
+
+                    default:
+                        if (ch === '0') {
+                            if (isDecimalDigit(source.charCodeAt(index))) {
+                                // Illegal: \01 \02 and so on
+                                throwError(Messages.TemplateOctalLiteral);
+                            }
+                            cooked += '\0';
+                        } else if (isOctalDigit(ch)) {
+                            // Illegal: \1 \2
+                            throwError(Messages.TemplateOctalLiteral);
+                        } else {
+                            cooked += ch;
+                        }
+                        break;
+                    }
+                } else {
+                    ++lineNumber;
+                    if (ch === '\r' && source[index] === '\n') {
+                        ++index;
+                    }
+                    lineStart = index;
+                }
+            } else if (isLineTerminator(ch.charCodeAt(0))) {
+                ++lineNumber;
+                if (ch === '\r' && source[index] === '\n') {
+                    ++index;
+                }
+                lineStart = index;
+                cooked += '\n';
+            } else {
+                cooked += ch;
+            }
+        }
+
+        if (!terminated) {
+            throwUnexpectedToken();
+        }
+
+        if (!head) {
+            state.curlyStack.pop();
+        }
+
+        return {
+            type: Token.Template,
+            value: {
+                cooked: cooked,
+                raw: source.slice(start + 1, index - rawOffset)
+            },
+            head: head,
+            tail: tail,
+            lineNumber: lineNumber,
+            lineStart: lineStart,
+            start: start,
+            end: index
+        };
+    }
+
+    // ECMA-262 11.8.5 Regular Expression Literals
+
+    function testRegExp(pattern, flags) {
+        // The BMP character to use as a replacement for astral symbols when
+        // translating an ES6 "u"-flagged pattern to an ES5-compatible
+        // approximation.
+        // Note: replacing with '\uFFFF' enables false positives in unlikely
+        // scenarios. For example, `[\u{1044f}-\u{10440}]` is an invalid
+        // pattern that would not be detected by this substitution.
+        var astralSubstitute = '\uFFFF',
+            tmp = pattern;
+
+        if (flags.indexOf('u') >= 0) {
+            tmp = tmp
+                // Replace every Unicode escape sequence with the equivalent
+                // BMP character or a constant ASCII code point in the case of
+                // astral symbols. (See the above note on `astralSubstitute`
+                // for more information.)
+                .replace(/\\u\{([0-9a-fA-F]+)\}|\\u([a-fA-F0-9]{4})/g, function ($0, $1, $2) {
+                    var codePoint = parseInt($1 || $2, 16);
+                    if (codePoint > 0x10FFFF) {
+                        throwUnexpectedToken(null, Messages.InvalidRegExp);
+                    }
+                    if (codePoint <= 0xFFFF) {
+                        return String.fromCharCode(codePoint);
+                    }
+                    return astralSubstitute;
+                })
+                // Replace each paired surrogate with a single ASCII symbol to
+                // avoid throwing on regular expressions that are only valid in
+                // combination with the "u" flag.
+                .replace(
+                    /[\uD800-\uDBFF][\uDC00-\uDFFF]/g,
+                    astralSubstitute
+                );
+        }
+
+        // First, detect invalid regular expressions.
+        try {
+            RegExp(tmp);
+        } catch (e) {
+            throwUnexpectedToken(null, Messages.InvalidRegExp);
+        }
+
+        // Return a regular expression object for this pattern-flag pair, or
+        // `null` in case the current environment doesn't support the flags it
+        // uses.
+        try {
+            return new RegExp(pattern, flags);
+        } catch (exception) {
+            /* istanbul ignore next */
+            return null;
+        }
+    }
+
+    function scanRegExpBody() {
+        var ch, str, classMarker, terminated, body;
+
+        ch = source[index];
+        assert(ch === '/', 'Regular expression literal must start with a slash');
+        str = source[index++];
+
+        classMarker = false;
+        terminated = false;
+        while (index < length) {
+            ch = source[index++];
+            str += ch;
+            if (ch === '\\') {
+                ch = source[index++];
+                // ECMA-262 7.8.5
+                if (isLineTerminator(ch.charCodeAt(0))) {
+                    throwUnexpectedToken(null, Messages.UnterminatedRegExp);
+                }
+                str += ch;
+            } else if (isLineTerminator(ch.charCodeAt(0))) {
+                throwUnexpectedToken(null, Messages.UnterminatedRegExp);
+            } else if (classMarker) {
+                if (ch === ']') {
+                    classMarker = false;
+                }
+            } else {
+                if (ch === '/') {
+                    terminated = true;
+                    break;
+                } else if (ch === '[') {
+                    classMarker = true;
+                }
+            }
+        }
+
+        if (!terminated) {
+            throwUnexpectedToken(null, Messages.UnterminatedRegExp);
+        }
+
+        // Exclude leading and trailing slash.
+        body = str.substr(1, str.length - 2);
+        return {
+            value: body,
+            literal: str
+        };
+    }
+
+    function scanRegExpFlags() {
+        var ch, str, flags, restore;
+
+        str = '';
+        flags = '';
+        while (index < length) {
+            ch = source[index];
+            if (!isIdentifierPart(ch.charCodeAt(0))) {
+                break;
+            }
+
+            ++index;
+            if (ch === '\\' && index < length) {
+                ch = source[index];
+                if (ch === 'u') {
+                    ++index;
+                    restore = index;
+                    ch = scanHexEscape('u');
+                    if (ch) {
+                        flags += ch;
+                        for (str += '\\u'; restore < index; ++restore) {
+                            str += source[restore];
+                        }
+                    } else {
+                        index = restore;
+                        flags += 'u';
+                        str += '\\u';
+                    }
+                    tolerateUnexpectedToken();
+                } else {
+                    str += '\\';
+                    tolerateUnexpectedToken();
+                }
+            } else {
+                flags += ch;
+                str += ch;
+            }
+        }
+
+        return {
+            value: flags,
+            literal: str
+        };
+    }
+
+    function scanRegExp() {
+        var start, body, flags, value;
+        scanning = true;
+
+        lookahead = null;
+        skipComment();
+        start = index;
+
+        body = scanRegExpBody();
+        flags = scanRegExpFlags();
+        value = testRegExp(body.value, flags.value);
+        scanning = false;
+        if (extra.tokenize) {
+            return {
+                type: Token.RegularExpression,
+                value: value,
+                regex: {
+                    pattern: body.value,
+                    flags: flags.value
+                },
+                lineNumber: lineNumber,
+                lineStart: lineStart,
+                start: start,
+                end: index
+            };
+        }
+
+        return {
+            literal: body.literal + flags.literal,
+            value: value,
+            regex: {
+                pattern: body.value,
+                flags: flags.value
+            },
+            start: start,
+            end: index
+        };
+    }
+
+    function collectRegex() {
+        var pos, loc, regex, token;
+
+        skipComment();
+
+        pos = index;
+        loc = {
+            start: {
+                line: lineNumber,
+                column: index - lineStart
+            }
+        };
+
+        regex = scanRegExp();
+
+        loc.end = {
+            line: lineNumber,
+            column: index - lineStart
+        };
+
+        /* istanbul ignore next */
+        if (!extra.tokenize) {
+            // Pop the previous token, which is likely '/' or '/='
+            if (extra.tokens.length > 0) {
+                token = extra.tokens[extra.tokens.length - 1];
+                if (token.range[0] === pos && token.type === 'Punctuator') {
+                    if (token.value === '/' || token.value === '/=') {
+                        extra.tokens.pop();
+                    }
+                }
+            }
+
+            extra.tokens.push({
+                type: 'RegularExpression',
+                value: regex.literal,
+                regex: regex.regex,
+                range: [pos, index],
+                loc: loc
+            });
+        }
+
+        return regex;
+    }
+
+    function isIdentifierName(token) {
+        return token.type === Token.Identifier ||
+            token.type === Token.Keyword ||
+            token.type === Token.BooleanLiteral ||
+            token.type === Token.NullLiteral;
+    }
+
+    // Using the following algorithm:
+    // https://github.com/mozilla/sweet.js/wiki/design
+
+    function advanceSlash() {
+        var regex, previous, check;
+
+        function testKeyword(value) {
+            return value && (value.length > 1) && (value[0] >= 'a') && (value[0] <= 'z');
+        }
+
+        previous = extra.tokenValues[extra.tokenValues.length - 1];
+        regex = (previous !== null);
+
+        switch (previous) {
+        case 'this':
+        case ']':
+            regex = false;
+            break;
+
+        case ')':
+            check = extra.tokenValues[extra.openParenToken - 1];
+            regex = (check === 'if' || check === 'while' || check === 'for' || check === 'with');
+            break;
+
+        case '}':
+            // Dividing a function by anything makes little sense,
+            // but we have to check for that.
+            regex = false;
+            if (testKeyword(extra.tokenValues[extra.openCurlyToken - 3])) {
+                // Anonymous function, e.g. function(){} /42
+                check = extra.tokenValues[extra.openCurlyToken - 4];
+                regex = check ? (FnExprTokens.indexOf(check) < 0) : false;
+            } else if (testKeyword(extra.tokenValues[extra.openCurlyToken - 4])) {
+                // Named function, e.g. function f(){} /42/
+                check = extra.tokenValues[extra.openCurlyToken - 5];
+                regex = check ? (FnExprTokens.indexOf(check) < 0) : true;
+            }
+        }
+
+        return regex ? collectRegex() : scanPunctuator();
+    }
+
+    function advance() {
+        var cp, token;
+
+        if (index >= length) {
+            return {
+                type: Token.EOF,
+                lineNumber: lineNumber,
+                lineStart: lineStart,
+                start: index,
+                end: index
+            };
+        }
+
+        cp = source.charCodeAt(index);
+
+        if (isIdentifierStart(cp)) {
+            token = scanIdentifier();
+            if (strict && isStrictModeReservedWord(token.value)) {
+                token.type = Token.Keyword;
+            }
+            return token;
+        }
+
+        // Very common: ( and ) and ;
+        if (cp === 0x28 || cp === 0x29 || cp === 0x3B) {
+            return scanPunctuator();
+        }
+
+        // String literal starts with single quote (U+0027) or double quote (U+0022).
+        if (cp === 0x27 || cp === 0x22) {
+            return scanStringLiteral();
+        }
+
+        // Dot (.) U+002E can also start a floating-point number, hence the need
+        // to check the next character.
+        if (cp === 0x2E) {
+            if (isDecimalDigit(source.charCodeAt(index + 1))) {
+                return scanNumericLiteral();
+            }
+            return scanPunctuator();
+        }
+
+        if (isDecimalDigit(cp)) {
+            return scanNumericLiteral();
+        }
+
+        // Slash (/) U+002F can also start a regex.
+        if (extra.tokenize && cp === 0x2F) {
+            return advanceSlash();
+        }
+
+        // Template literals start with ` (U+0060) for template head
+        // or } (U+007D) for template middle or template tail.
+        if (cp === 0x60 || (cp === 0x7D && state.curlyStack[state.curlyStack.length - 1] === '${')) {
+            return scanTemplate();
+        }
+
+        // Possible identifier start in a surrogate pair.
+        if (cp >= 0xD800 && cp < 0xDFFF) {
+            cp = codePointAt(index);
+            if (isIdentifierStart(cp)) {
+                return scanIdentifier();
+            }
+        }
+
+        return scanPunctuator();
+    }
+
+    function collectToken() {
+        var loc, token, value, entry;
+
+        loc = {
+            start: {
+                line: lineNumber,
+                column: index - lineStart
+            }
+        };
+
+        token = advance();
+        loc.end = {
+            line: lineNumber,
+            column: index - lineStart
+        };
+
+        if (token.type !== Token.EOF) {
+            value = source.slice(token.start, token.end);
+            entry = {
+                type: TokenName[token.type],
+                value: value,
+                range: [token.start, token.end],
+                loc: loc
+            };
+            if (token.regex) {
+                entry.regex = {
+                    pattern: token.regex.pattern,
+                    flags: token.regex.flags
+                };
+            }
+            if (extra.tokenValues) {
+                extra.tokenValues.push((entry.type === 'Punctuator' || entry.type === 'Keyword') ? entry.value : null);
+            }
+            if (extra.tokenize) {
+                if (!extra.range) {
+                    delete entry.range;
+                }
+                if (!extra.loc) {
+                    delete entry.loc;
+                }
+                if (extra.delegate) {
+                    entry = extra.delegate(entry);
+                }
+            }
+            extra.tokens.push(entry);
+        }
+
+        return token;
+    }
+
+    function lex() {
+        var token;
+        scanning = true;
+
+        lastIndex = index;
+        lastLineNumber = lineNumber;
+        lastLineStart = lineStart;
+
+        skipComment();
+
+        token = lookahead;
+
+        startIndex = index;
+        startLineNumber = lineNumber;
+        startLineStart = lineStart;
+
+        lookahead = (typeof extra.tokens !== 'undefined') ? collectToken() : advance();
+        scanning = false;
+        return token;
+    }
+
+    function peek() {
+        scanning = true;
+
+        skipComment();
+
+        lastIndex = index;
+        lastLineNumber = lineNumber;
+        lastLineStart = lineStart;
+
+        startIndex = index;
+        startLineNumber = lineNumber;
+        startLineStart = lineStart;
+
+        lookahead = (typeof extra.tokens !== 'undefined') ? collectToken() : advance();
+        scanning = false;
+    }
+
+    function Position() {
+        this.line = startLineNumber;
+        this.column = startIndex - startLineStart;
+    }
+
+    function SourceLocation() {
+        this.start = new Position();
+        this.end = null;
+    }
+
+    function WrappingSourceLocation(startToken) {
+        this.start = {
+            line: startToken.lineNumber,
+            column: startToken.start - startToken.lineStart
+        };
+        this.end = null;
+    }
+
+    function Node() {
+        if (extra.range) {
+            this.range = [startIndex, 0];
+        }
+        if (extra.loc) {
+            this.loc = new SourceLocation();
+        }
+    }
+
+    function WrappingNode(startToken) {
+        if (extra.range) {
+            this.range = [startToken.start, 0];
+        }
+        if (extra.loc) {
+            this.loc = new WrappingSourceLocation(startToken);
+        }
+    }
+
+    WrappingNode.prototype = Node.prototype = {
+
+        processComment: function () {
+            var lastChild,
+                innerComments,
+                leadingComments,
+                trailingComments,
+                bottomRight = extra.bottomRightStack,
+                i,
+                comment,
+                last = bottomRight[bottomRight.length - 1];
+
+            if (this.type === Syntax.Program) {
+                if (this.body.length > 0) {
+                    return;
+                }
+            }
+            /**
+             * patch innnerComments for properties empty block
+             * `function a() {/** comments **\/}`
+             */
+
+            if (this.type === Syntax.BlockStatement && this.body.length === 0) {
+                innerComments = [];
+                for (i = extra.leadingComments.length - 1; i >= 0; --i) {
+                    comment = extra.leadingComments[i];
+                    if (this.range[1] >= comment.range[1]) {
+                        innerComments.unshift(comment);
+                        extra.leadingComments.splice(i, 1);
+                        extra.trailingComments.splice(i, 1);
+                    }
+                }
+                if (innerComments.length) {
+                    this.innerComments = innerComments;
+                    //bottomRight.push(this);
+                    return;
+                }
+            }
+
+            if (extra.trailingComments.length > 0) {
+                trailingComments = [];
+                for (i = extra.trailingComments.length - 1; i >= 0; --i) {
+                    comment = extra.trailingComments[i];
+                    if (comment.range[0] >= this.range[1]) {
+                        trailingComments.unshift(comment);
+                        extra.trailingComments.splice(i, 1);
+                    }
+                }
+                extra.trailingComments = [];
+            } else {
+                if (last && last.trailingComments && last.trailingComments[0].range[0] >= this.range[1]) {
+                    trailingComments = last.trailingComments;
+                    delete last.trailingComments;
+                }
+            }
+
+            // Eating the stack.
+            while (last && last.range[0] >= this.range[0]) {
+                lastChild = bottomRight.pop();
+                last = bottomRight[bottomRight.length - 1];
+            }
+
+            if (lastChild) {
+                if (lastChild.leadingComments) {
+                    leadingComments = [];
+                    for (i = lastChild.leadingComments.length - 1; i >= 0; --i) {
+                        comment = lastChild.leadingComments[i];
+                        if (comment.range[1] <= this.range[0]) {
+                            leadingComments.unshift(comment);
+                            lastChild.leadingComments.splice(i, 1);
+                        }
+                    }
+
+                    if (!lastChild.leadingComments.length) {
+                        lastChild.leadingComments = undefined;
+                    }
+                }
+            } else if (extra.leadingComments.length > 0) {
+                leadingComments = [];
+                for (i = extra.leadingComments.length - 1; i >= 0; --i) {
+                    comment = extra.leadingComments[i];
+                    if (comment.range[1] <= this.range[0]) {
+                        leadingComments.unshift(comment);
+                        extra.leadingComments.splice(i, 1);
+                    }
+                }
+            }
+
+
+            if (leadingComments && leadingComments.length > 0) {
+                this.leadingComments = leadingComments;
+            }
+            if (trailingComments && trailingComments.length > 0) {
+                this.trailingComments = trailingComments;
+            }
+
+            bottomRight.push(this);
+        },
+
+        finish: function () {
+            if (extra.range) {
+                this.range[1] = lastIndex;
+            }
+            if (extra.loc) {
+                this.loc.end = {
+                    line: lastLineNumber,
+                    column: lastIndex - lastLineStart
+                };
+                if (extra.source) {
+                    this.loc.source = extra.source;
+                }
+            }
+
+            if (extra.attachComment) {
+                this.processComment();
+            }
+        },
+
+        finishArrayExpression: function (elements) {
+            this.type = Syntax.ArrayExpression;
+            this.elements = elements;
+            this.finish();
+            return this;
+        },
+
+        finishArrayPattern: function (elements) {
+            this.type = Syntax.ArrayPattern;
+            this.elements = elements;
+            this.finish();
+            return this;
+        },
+
+        finishArrowFunctionExpression: function (params, defaults, body, expression) {
+            this.type = Syntax.ArrowFunctionExpression;
+            this.id = null;
+            this.params = params;
+            this.defaults = defaults;
+            this.body = body;
+            this.generator = false;
+            this.expression = expression;
+            this.finish();
+            return this;
+        },
+
+        finishAssignmentExpression: function (operator, left, right) {
+            this.type = Syntax.AssignmentExpression;
+            this.operator = operator;
+            this.left = left;
+            this.right = right;
+            this.finish();
+            return this;
+        },
+
+        finishAssignmentPattern: function (left, right) {
+            this.type = Syntax.AssignmentPattern;
+            this.left = left;
+            this.right = right;
+            this.finish();
+            return this;
+        },
+
+        finishBinaryExpression: function (operator, left, right) {
+            this.type = (operator === '||' || operator === '&&') ? Syntax.LogicalExpression : Syntax.BinaryExpression;
+            this.operator = operator;
+            this.left = left;
+            this.right = right;
+            this.finish();
+            return this;
+        },
+
+        finishBlockStatement: function (body) {
+            this.type = Syntax.BlockStatement;
+            this.body = body;
+            this.finish();
+            return this;
+        },
+
+        finishBreakStatement: function (label) {
+            this.type = Syntax.BreakStatement;
+            this.label = label;
+            this.finish();
+            return this;
+        },
+
+        finishCallExpression: function (callee, args) {
+            this.type = Syntax.CallExpression;
+            this.callee = callee;
+            this.arguments = args;
+            this.finish();
+            return this;
+        },
+
+        finishCatchClause: function (param, body) {
+            this.type = Syntax.CatchClause;
+            this.param = param;
+            this.body = body;
+            this.finish();
+            return this;
+        },
+
+        finishClassBody: function (body) {
+            this.type = Syntax.ClassBody;
+            this.body = body;
+            this.finish();
+            return this;
+        },
+
+        finishClassDeclaration: function (id, superClass, body) {
+            this.type = Syntax.ClassDeclaration;
+            this.id = id;
+            this.superClass = superClass;
+            this.body = body;
+            this.finish();
+            return this;
+        },
+
+        finishClassExpression: function (id, superClass, body) {
+            this.type = Syntax.ClassExpression;
+            this.id = id;
+            this.superClass = superClass;
+            this.body = body;
+            this.finish();
+            return this;
+        },
+
+        finishConditionalExpression: function (test, consequent, alternate) {
+            this.type = Syntax.ConditionalExpression;
+            this.test = test;
+            this.consequent = consequent;
+            this.alternate = alternate;
+            this.finish();
+            return this;
+        },
+
+        finishContinueStatement: function (label) {
+            this.type = Syntax.ContinueStatement;
+            this.label = label;
+            this.finish();
+            return this;
+        },
+
+        finishDebuggerStatement: function () {
+            this.type = Syntax.DebuggerStatement;
+            this.finish();
+            return this;
+        },
+
+        finishDoWhileStatement: function (body, test) {
+            this.type = Syntax.DoWhileStatement;
+            this.body = body;
+            this.test = test;
+            this.finish();
+            return this;
+        },
+
+        finishEmptyStatement: function () {
+            this.type = Syntax.EmptyStatement;
+            this.finish();
+            return this;
+        },
+
+        finishExpressionStatement: function (expression) {
+            this.type = Syntax.ExpressionStatement;
+            this.expression = expression;
+            this.finish();
+            return this;
+        },
+
+        finishForStatement: function (init, test, update, body) {
+            this.type = Syntax.ForStatement;
+            this.init = init;
+            this.test = test;
+            this.update = update;
+            this.body = body;
+            this.finish();
+            return this;
+        },
+
+        finishForOfStatement: function (left, right, body) {
+            this.type = Syntax.ForOfStatement;
+            this.left = left;
+            this.right = right;
+            this.body = body;
+            this.finish();
+            return this;
+        },
+
+        finishForInStatement: function (left, right, body) {
+            this.type = Syntax.ForInStatement;
+            this.left = left;
+            this.right = right;
+            this.body = body;
+            this.each = false;
+            this.finish();
+            return this;
+        },
+
+        finishFunctionDeclaration: function (id, params, defaults, body, generator) {
+            this.type = Syntax.FunctionDeclaration;
+            this.id = id;
+            this.params = params;
+            this.defaults = defaults;
+            this.body = body;
+            this.generator = generator;
+            this.expression = false;
+            this.finish();
+            return this;
+        },
+
+        finishFunctionExpression: function (id, params, defaults, body, generator) {
+            this.type = Syntax.FunctionExpression;
+            this.id = id;
+            this.params = params;
+            this.defaults = defaults;
+            this.body = body;
+            this.generator = generator;
+            this.expression = false;
+            this.finish();
+            return this;
+        },
+
+        finishIdentifier: function (name) {
+            this.type = Syntax.Identifier;
+            this.name = name;
+            this.finish();
+            return this;
+        },
+
+        finishIfStatement: function (test, consequent, alternate) {
+            this.type = Syntax.IfStatement;
+            this.test = test;
+            this.consequent = consequent;
+            this.alternate = alternate;
+            this.finish();
+            return this;
+        },
+
+        finishLabeledStatement: function (label, body) {
+            this.type = Syntax.LabeledStatement;
+            this.label = label;
+            this.body = body;
+            this.finish();
+            return this;
+        },
+
+        finishLiteral: function (token) {
+            this.type = Syntax.Literal;
+            this.value = token.value;
+            this.raw = source.slice(token.start, token.end);
+            if (token.regex) {
+                this.regex = token.regex;
+            }
+            this.finish();
+            return this;
+        },
+
+        finishMemberExpression: function (accessor, object, property) {
+            this.type = Syntax.MemberExpression;
+            this.computed = accessor === '[';
+            this.object = object;
+            this.property = property;
+            this.finish();
+            return this;
+        },
+
+        finishMetaProperty: function (meta, property) {
+            this.type = Syntax.MetaProperty;
+            this.meta = meta;
+            this.property = property;
+            this.finish();
+            return this;
+        },
+
+        finishNewExpression: function (callee, args) {
+            this.type = Syntax.NewExpression;
+            this.callee = callee;
+            this.arguments = args;
+            this.finish();
+            return this;
+        },
+
+        finishObjectExpression: function (properties) {
+            this.type = Syntax.ObjectExpression;
+            this.properties = properties;
+            this.finish();
+            return this;
+        },
+
+        finishObjectPattern: function (properties) {
+            this.type = Syntax.ObjectPattern;
+            this.properties = properties;
+            this.finish();
+            return this;
+        },
+
+        finishPostfixExpression: function (operator, argument) {
+            this.type = Syntax.UpdateExpression;
+            this.operator = operator;
+            this.argument = argument;
+            this.prefix = false;
+            this.finish();
+            return this;
+        },
+
+        finishProgram: function (body, sourceType) {
+            this.type = Syntax.Program;
+            this.body = body;
+            this.sourceType = sourceType;
+            this.finish();
+            return this;
+        },
+
+        finishProperty: function (kind, key, computed, value, method, shorthand) {
+            this.type = Syntax.Property;
+            this.key = key;
+            this.computed = computed;
+            this.value = value;
+            this.kind = kind;
+            this.method = method;
+            this.shorthand = shorthand;
+            this.finish();
+            return this;
+        },
+
+        finishRestElement: function (argument) {
+            this.type = Syntax.RestElement;
+            this.argument = argument;
+            this.finish();
+            return this;
+        },
+
+        finishReturnStatement: function (argument) {
+            this.type = Syntax.ReturnStatement;
+            this.argument = argument;
+            this.finish();
+            return this;
+        },
+
+        finishSequenceExpression: function (expressions) {
+            this.type = Syntax.SequenceExpression;
+            this.expressions = expressions;
+            this.finish();
+            return this;
+        },
+
+        finishSpreadElement: function (argument) {
+            this.type = Syntax.SpreadElement;
+            this.argument = argument;
+            this.finish();
+            return this;
+        },
+
+        finishSwitchCase: function (test, consequent) {
+            this.type = Syntax.SwitchCase;
+            this.test = test;
+            this.consequent = consequent;
+            this.finish();
+            return this;
+        },
+
+        finishSuper: function () {
+            this.type = Syntax.Super;
+            this.finish();
+            return this;
+        },
+
+        finishSwitchStatement: function (discriminant, cases) {
+            this.type = Syntax.SwitchStatement;
+            this.discriminant = discriminant;
+            this.cases = cases;
+            this.finish();
+            return this;
+        },
+
+        finishTaggedTemplateExpression: function (tag, quasi) {
+            this.type = Syntax.TaggedTemplateExpression;
+            this.tag = tag;
+            this.quasi = quasi;
+            this.finish();
+            return this;
+        },
+
+        finishTemplateElement: function (value, tail) {
+            this.type = Syntax.TemplateElement;
+            this.value = value;
+            this.tail = tail;
+            this.finish();
+            return this;
+        },
+
+        finishTemplateLiteral: function (quasis, expressions) {
+            this.type = Syntax.TemplateLiteral;
+            this.quasis = quasis;
+            this.expressions = expressions;
+            this.finish();
+            return this;
+        },
+
+        finishThisExpression: function () {
+            this.type = Syntax.ThisExpression;
+            this.finish();
+            return this;
+        },
+
+        finishThrowStatement: function (argument) {
+            this.type = Syntax.ThrowStatement;
+            this.argument = argument;
+            this.finish();
+            return this;
+        },
+
+        finishTryStatement: function (block, handler, finalizer) {
+            this.type = Syntax.TryStatement;
+            this.block = block;
+            this.guardedHandlers = [];
+            this.handlers = handler ? [handler] : [];
+            this.handler = handler;
+            this.finalizer = finalizer;
+            this.finish();
+            return this;
+        },
+
+        finishUnaryExpression: function (operator, argument) {
+            this.type = (operator === '++' || operator === '--') ? Syntax.UpdateExpression : Syntax.UnaryExpression;
+            this.operator = operator;
+            this.argument = argument;
+            this.prefix = true;
+            this.finish();
+            return this;
+        },
+
+        finishVariableDeclaration: function (declarations) {
+            this.type = Syntax.VariableDeclaration;
+            this.declarations = declarations;
+            this.kind = 'var';
+            this.finish();
+            return this;
+        },
+
+        finishLexicalDeclaration: function (declarations, kind) {
+            this.type = Syntax.VariableDeclaration;
+            this.declarations = declarations;
+            this.kind = kind;
+            this.finish();
+            return this;
+        },
+
+        finishVariableDeclarator: function (id, init) {
+            this.type = Syntax.VariableDeclarator;
+            this.id = id;
+            this.init = init;
+            this.finish();
+            return this;
+        },
+
+        finishWhileStatement: function (test, body) {
+            this.type = Syntax.WhileStatement;
+            this.test = test;
+            this.body = body;
+            this.finish();
+            return this;
+        },
+
+        finishWithStatement: function (object, body) {
+            this.type = Syntax.WithStatement;
+            this.object = object;
+            this.body = body;
+            this.finish();
+            return this;
+        },
+
+        finishExportSpecifier: function (local, exported) {
+            this.type = Syntax.ExportSpecifier;
+            this.exported = exported || local;
+            this.local = local;
+            this.finish();
+            return this;
+        },
+
+        finishImportDefaultSpecifier: function (local) {
+            this.type = Syntax.ImportDefaultSpecifier;
+            this.local = local;
+            this.finish();
+            return this;
+        },
+
+        finishImportNamespaceSpecifier: function (local) {
+            this.type = Syntax.ImportNamespaceSpecifier;
+            this.local = local;
+            this.finish();
+            return this;
+        },
+
+        finishExportNamedDeclaration: function (declaration, specifiers, src) {
+            this.type = Syntax.ExportNamedDeclaration;
+            this.declaration = declaration;
+            this.specifiers = specifiers;
+            this.source = src;
+            this.finish();
+            return this;
+        },
+
+        finishExportDefaultDeclaration: function (declaration) {
+            this.type = Syntax.ExportDefaultDeclaration;
+            this.declaration = declaration;
+            this.finish();
+            return this;
+        },
+
+        finishExportAllDeclaration: function (src) {
+            this.type = Syntax.ExportAllDeclaration;
+            this.source = src;
+            this.finish();
+            return this;
+        },
+
+        finishImportSpecifier: function (local, imported) {
+            this.type = Syntax.ImportSpecifier;
+            this.local = local || imported;
+            this.imported = imported;
+            this.finish();
+            return this;
+        },
+
+        finishImportDeclaration: function (specifiers, src) {
+            this.type = Syntax.ImportDeclaration;
+            this.specifiers = specifiers;
+            this.source = src;
+            this.finish();
+            return this;
+        },
+
+        finishYieldExpression: function (argument, delegate) {
+            this.type = Syntax.YieldExpression;
+            this.argument = argument;
+            this.delegate = delegate;
+            this.finish();
+            return this;
+        }
+    };
+
+
+    function recordError(error) {
+        var e, existing;
+
+        for (e = 0; e < extra.errors.length; e++) {
+            existing = extra.errors[e];
+            // Prevent duplicated error.
+            /* istanbul ignore next */
+            if (existing.index === error.index && existing.message === error.message) {
+                return;
+            }
+        }
+
+        extra.errors.push(error);
+    }
+
+    function constructError(msg, column) {
+        var error = new Error(msg);
+        try {
+            throw error;
+        } catch (base) {
+            /* istanbul ignore else */
+            if (Object.create && Object.defineProperty) {
+                error = Object.create(base);
+                Object.defineProperty(error, 'column', { value: column });
+            }
+        } finally {
+            return error;
+        }
+    }
+
+    function createError(line, pos, description) {
+        var msg, column, error;
+
+        msg = 'Line ' + line + ': ' + description;
+        column = pos - (scanning ? lineStart : lastLineStart) + 1;
+        error = constructError(msg, column);
+        error.lineNumber = line;
+        error.description = description;
+        error.index = pos;
+        return error;
+    }
+
+    // Throw an exception
+
+    function throwError(messageFormat) {
+        var args, msg;
+
+        args = Array.prototype.slice.call(arguments, 1);
+        msg = messageFormat.replace(/%(\d)/g,
+            function (whole, idx) {
+                assert(idx < args.length, 'Message reference must be in range');
+                return args[idx];
+            }
+        );
+
+        throw createError(lastLineNumber, lastIndex, msg);
+    }
+
+    function tolerateError(messageFormat) {
+        var args, msg, error;
+
+        args = Array.prototype.slice.call(arguments, 1);
+        /* istanbul ignore next */
+        msg = messageFormat.replace(/%(\d)/g,
+            function (whole, idx) {
+                assert(idx < args.length, 'Message reference must be in range');
+                return args[idx];
+            }
+        );
+
+        error = createError(lineNumber, lastIndex, msg);
+        if (extra.errors) {
+            recordError(error);
+        } else {
+            throw error;
+        }
+    }
+
+    // Throw an exception because of the token.
+
+    function unexpectedTokenError(token, message) {
+        var value, msg = message || Messages.UnexpectedToken;
+
+        if (token) {
+            if (!message) {
+                msg = (token.type === Token.EOF) ? Messages.UnexpectedEOS :
+                    (token.type === Token.Identifier) ? Messages.UnexpectedIdentifier :
+                    (token.type === Token.NumericLiteral) ? Messages.UnexpectedNumber :
+                    (token.type === Token.StringLiteral) ? Messages.UnexpectedString :
+                    (token.type === Token.Template) ? Messages.UnexpectedTemplate :
+                    Messages.UnexpectedToken;
+
+                if (token.type === Token.Keyword) {
+                    if (isFutureReservedWord(token.value)) {
+                        msg = Messages.UnexpectedReserved;
+                    } else if (strict && isStrictModeReservedWord(token.value)) {
+                        msg = Messages.StrictReservedWord;
+                    }
+                }
+            }
+
+            value = (token.type === Token.Template) ? token.value.raw : token.value;
+        } else {
+            value = 'ILLEGAL';
+        }
+
+        msg = msg.replace('%0', value);
+
+        return (token && typeof token.lineNumber === 'number') ?
+            createError(token.lineNumber, token.start, msg) :
+            createError(scanning ? lineNumber : lastLineNumber, scanning ? index : lastIndex, msg);
+    }
+
+    function throwUnexpectedToken(token, message) {
+        throw unexpectedTokenError(token, message);
+    }
+
+    function tolerateUnexpectedToken(token, message) {
+        var error = unexpectedTokenError(token, message);
+        if (extra.errors) {
+            recordError(error);
+        } else {
+            throw error;
+        }
+    }
+
+    // Expect the next token to match the specified punctuator.
+    // If not, an exception will be thrown.
+
+    function expect(value) {
+        var token = lex();
+        if (token.type !== Token.Punctuator || token.value !== value) {
+            throwUnexpectedToken(token);
+        }
+    }
+
+    /**
+     * @name expectCommaSeparator
+     * @description Quietly expect a comma when in tolerant mode, otherwise delegates
+     * to <code>expect(value)</code>
+     * @since 2.0
+     */
+    function expectCommaSeparator() {
+        var token;
+
+        if (extra.errors) {
+            token = lookahead;
+            if (token.type === Token.Punctuator && token.value === ',') {
+                lex();
+            } else if (token.type === Token.Punctuator && token.value === ';') {
+                lex();
+                tolerateUnexpectedToken(token);
+            } else {
+                tolerateUnexpectedToken(token, Messages.UnexpectedToken);
+            }
+        } else {
+            expect(',');
+        }
+    }
+
+    // Expect the next token to match the specified keyword.
+    // If not, an exception will be thrown.
+
+    function expectKeyword(keyword) {
+        var token = lex();
+        if (token.type !== Token.Keyword || token.value !== keyword) {
+            throwUnexpectedToken(token);
+        }
+    }
+
+    // Return true if the next token matches the specified punctuator.
+
+    function match(value) {
+        return lookahead.type === Token.Punctuator && lookahead.value === value;
+    }
+
+    // Return true if the next token matches the specified keyword
+
+    function matchKeyword(keyword) {
+        return lookahead.type === Token.Keyword && lookahead.value === keyword;
+    }
+
+    // Return true if the next token matches the specified contextual keyword
+    // (where an identifier is sometimes a keyword depending on the context)
+
+    function matchContextualKeyword(keyword) {
+        return lookahead.type === Token.Identifier && lookahead.value === keyword;
+    }
+
+    // Return true if the next token is an assignment operator
+
+    function matchAssign() {
+        var op;
+
+        if (lookahead.type !== Token.Punctuator) {
+            return false;
+        }
+        op = lookahead.value;
+        return op === '=' ||
+            op === '*=' ||
+            op === '/=' ||
+            op === '%=' ||
+            op === '+=' ||
+            op === '-=' ||
+            op === '<<=' ||
+            op === '>>=' ||
+            op === '>>>=' ||
+            op === '&=' ||
+            op === '^=' ||
+            op === '|=';
+    }
+
+    function consumeSemicolon() {
+        // Catch the very common case first: immediately a semicolon (U+003B).
+        if (source.charCodeAt(startIndex) === 0x3B || match(';')) {
+            lex();
+            return;
+        }
+
+        if (hasLineTerminator) {
+            return;
+        }
+
+        // FIXME(ikarienator): this is seemingly an issue in the previous location info convention.
+        lastIndex = startIndex;
+        lastLineNumber = startLineNumber;
+        lastLineStart = startLineStart;
+
+        if (lookahead.type !== Token.EOF && !match('}')) {
+            throwUnexpectedToken(lookahead);
+        }
+    }
+
+    // Cover grammar support.
+    //
+    // When an assignment expression position starts with an left parenthesis, the determination of the type
+    // of the syntax is to be deferred arbitrarily long until the end of the parentheses pair (plus a lookahead)
+    // or the first comma. This situation also defers the determination of all the expressions nested in the pair.
+    //
+    // There are three productions that can be parsed in a parentheses pair that needs to be determined
+    // after the outermost pair is closed. They are:
+    //
+    //   1. AssignmentExpression
+    //   2. BindingElements
+    //   3. AssignmentTargets
+    //
+    // In order to avoid exponential backtracking, we use two flags to denote if the production can be
+    // binding element or assignment target.
+    //
+    // The three productions have the relationship:
+    //
+    //   BindingElements ⊆ AssignmentTargets ⊆ AssignmentExpression
+    //
+    // with a single exception that CoverInitializedName when used directly in an Expression, generates
+    // an early error. Therefore, we need the third state, firstCoverInitializedNameError, to track the
+    // first usage of CoverInitializedName and report it when we reached the end of the parentheses pair.
+    //
+    // isolateCoverGrammar function runs the given parser function with a new cover grammar context, and it does not
+    // effect the current flags. This means the production the parser parses is only used as an expression. Therefore
+    // the CoverInitializedName check is conducted.
+    //
+    // inheritCoverGrammar function runs the given parse function with a new cover grammar context, and it propagates
+    // the flags outside of the parser. This means the production the parser parses is used as a part of a potential
+    // pattern. The CoverInitializedName check is deferred.
+    function isolateCoverGrammar(parser) {
+        var oldIsBindingElement = isBindingElement,
+            oldIsAssignmentTarget = isAssignmentTarget,
+            oldFirstCoverInitializedNameError = firstCoverInitializedNameError,
+            result;
+        isBindingElement = true;
+        isAssignmentTarget = true;
+        firstCoverInitializedNameError = null;
+        result = parser();
+        if (firstCoverInitializedNameError !== null) {
+            throwUnexpectedToken(firstCoverInitializedNameError);
+        }
+        isBindingElement = oldIsBindingElement;
+        isAssignmentTarget = oldIsAssignmentTarget;
+        firstCoverInitializedNameError = oldFirstCoverInitializedNameError;
+        return result;
+    }
+
+    function inheritCoverGrammar(parser) {
+        var oldIsBindingElement = isBindingElement,
+            oldIsAssignmentTarget = isAssignmentTarget,
+            oldFirstCoverInitializedNameError = firstCoverInitializedNameError,
+            result;
+        isBindingElement = true;
+        isAssignmentTarget = true;
+        firstCoverInitializedNameError = null;
+        result = parser();
+        isBindingElement = isBindingElement && oldIsBindingElement;
+        isAssignmentTarget = isAssignmentTarget && oldIsAssignmentTarget;
+        firstCoverInitializedNameError = oldFirstCoverInitializedNameError || firstCoverInitializedNameError;
+        return result;
+    }
+
+    // ECMA-262 13.3.3 Destructuring Binding Patterns
+
+    function parseArrayPattern(params, kind) {
+        var node = new Node(), elements = [], rest, restNode;
+        expect('[');
+
+        while (!match(']')) {
+            if (match(',')) {
+                lex();
+                elements.push(null);
+            } else {
+                if (match('...')) {
+                    restNode = new Node();
+                    lex();
+                    params.push(lookahead);
+                    rest = parseVariableIdentifier(kind);
+                    elements.push(restNode.finishRestElement(rest));
+                    break;
+                } else {
+                    elements.push(parsePatternWithDefault(params, kind));
+                }
+                if (!match(']')) {
+                    expect(',');
+                }
+            }
+
+        }
+
+        expect(']');
+
+        return node.finishArrayPattern(elements);
+    }
+
+    function parsePropertyPattern(params, kind) {
+        var node = new Node(), key, keyToken, computed = match('['), init;
+        if (lookahead.type === Token.Identifier) {
+            keyToken = lookahead;
+            key = parseVariableIdentifier();
+            if (match('=')) {
+                params.push(keyToken);
+                lex();
+                init = parseAssignmentExpression();
+
+                return node.finishProperty(
+                    'init', key, false,
+                    new WrappingNode(keyToken).finishAssignmentPattern(key, init), false, true);
+            } else if (!match(':')) {
+                params.push(keyToken);
+                return node.finishProperty('init', key, false, key, false, true);
+            }
+        } else {
+            key = parseObjectPropertyKey();
+        }
+        expect(':');
+        init = parsePatternWithDefault(params, kind);
+        return node.finishProperty('init', key, computed, init, false, false);
+    }
+
+    function parseObjectPattern(params, kind) {
+        var node = new Node(), properties = [];
+
+        expect('{');
+
+        while (!match('}')) {
+            properties.push(parsePropertyPattern(params, kind));
+            if (!match('}')) {
+                expect(',');
+            }
+        }
+
+        lex();
+
+        return node.finishObjectPattern(properties);
+    }
+
+    function parsePattern(params, kind) {
+        if (match('[')) {
+            return parseArrayPattern(params, kind);
+        } else if (match('{')) {
+            return parseObjectPattern(params, kind);
+        } else if (matchKeyword('let')) {
+            if (kind === 'const' || kind === 'let') {
+                tolerateUnexpectedToken(lookahead, Messages.UnexpectedToken);
+            }
+        }
+
+        params.push(lookahead);
+        return parseVariableIdentifier(kind);
+    }
+
+    function parsePatternWithDefault(params, kind) {
+        var startToken = lookahead, pattern, previousAllowYield, right;
+        pattern = parsePattern(params, kind);
+        if (match('=')) {
+            lex();
+            previousAllowYield = state.allowYield;
+            state.allowYield = true;
+            right = isolateCoverGrammar(parseAssignmentExpression);
+            state.allowYield = previousAllowYield;
+            pattern = new WrappingNode(startToken).finishAssignmentPattern(pattern, right);
+        }
+        return pattern;
+    }
+
+    // ECMA-262 12.2.5 Array Initializer
+
+    function parseArrayInitializer() {
+        var elements = [], node = new Node(), restSpread;
+
+        expect('[');
+
+        while (!match(']')) {
+            if (match(',')) {
+                lex();
+                elements.push(null);
+            } else if (match('...')) {
+                restSpread = new Node();
+                lex();
+                restSpread.finishSpreadElement(inheritCoverGrammar(parseAssignmentExpression));
+
+                if (!match(']')) {
+                    isAssignmentTarget = isBindingElement = false;
+                    expect(',');
+                }
+                elements.push(restSpread);
+            } else {
+                elements.push(inheritCoverGrammar(parseAssignmentExpression));
+
+                if (!match(']')) {
+                    expect(',');
+                }
+            }
+        }
+
+        lex();
+
+        return node.finishArrayExpression(elements);
+    }
+
+    // ECMA-262 12.2.6 Object Initializer
+
+    function parsePropertyFunction(node, paramInfo, isGenerator) {
+        var previousStrict, body;
+
+        isAssignmentTarget = isBindingElement = false;
+
+        previousStrict = strict;
+        body = isolateCoverGrammar(parseFunctionSourceElements);
+
+        if (strict && paramInfo.firstRestricted) {
+            tolerateUnexpectedToken(paramInfo.firstRestricted, paramInfo.message);
+        }
+        if (strict && paramInfo.stricted) {
+            tolerateUnexpectedToken(paramInfo.stricted, paramInfo.message);
+        }
+
+        strict = previousStrict;
+        return node.finishFunctionExpression(null, paramInfo.params, paramInfo.defaults, body, isGenerator);
+    }
+
+    function parsePropertyMethodFunction() {
+        var params, method, node = new Node(),
+            previousAllowYield = state.allowYield;
+
+        state.allowYield = false;
+        params = parseParams();
+        state.allowYield = previousAllowYield;
+
+        state.allowYield = false;
+        method = parsePropertyFunction(node, params, false);
+        state.allowYield = previousAllowYield;
+
+        return method;
+    }
+
+    function parseObjectPropertyKey() {
+        var token, node = new Node(), expr;
+
+        token = lex();
+
+        // Note: This function is called only from parseObjectProperty(), where
+        // EOF and Punctuator tokens are already filtered out.
+
+        switch (token.type) {
+        case Token.StringLiteral:
+        case Token.NumericLiteral:
+            if (strict && token.octal) {
+                tolerateUnexpectedToken(token, Messages.StrictOctalLiteral);
+            }
+            return node.finishLiteral(token);
+        case Token.Identifier:
+        case Token.BooleanLiteral:
+        case Token.NullLiteral:
+        case Token.Keyword:
+            return node.finishIdentifier(token.value);
+        case Token.Punctuator:
+            if (token.value === '[') {
+                expr = isolateCoverGrammar(parseAssignmentExpression);
+                expect(']');
+                return expr;
+            }
+            break;
+        }
+        throwUnexpectedToken(token);
+    }
+
+    function lookaheadPropertyName() {
+        switch (lookahead.type) {
+        case Token.Identifier:
+        case Token.StringLiteral:
+        case Token.BooleanLiteral:
+        case Token.NullLiteral:
+        case Token.NumericLiteral:
+        case Token.Keyword:
+            return true;
+        case Token.Punctuator:
+            return lookahead.value === '[';
+        }
+        return false;
+    }
+
+    // This function is to try to parse a MethodDefinition as defined in 14.3. But in the case of object literals,
+    // it might be called at a position where there is in fact a short hand identifier pattern or a data property.
+    // This can only be determined after we consumed up to the left parentheses.
+    //
+    // In order to avoid back tracking, it returns `null` if the position is not a MethodDefinition and the caller
+    // is responsible to visit other options.
+    function tryParseMethodDefinition(token, key, computed, node) {
+        var value, options, methodNode, params,
+            previousAllowYield = state.allowYield;
+
+        if (token.type === Token.Identifier) {
+            // check for `get` and `set`;
+
+            if (token.value === 'get' && lookaheadPropertyName()) {
+                computed = match('[');
+                key = parseObjectPropertyKey();
+                methodNode = new Node();
+                expect('(');
+                expect(')');
+
+                state.allowYield = false;
+                value = parsePropertyFunction(methodNode, {
+                    params: [],
+                    defaults: [],
+                    stricted: null,
+                    firstRestricted: null,
+                    message: null
+                }, false);
+                state.allowYield = previousAllowYield;
+
+                return node.finishProperty('get', key, computed, value, false, false);
+            } else if (token.value === 'set' && lookaheadPropertyName()) {
+                computed = match('[');
+                key = parseObjectPropertyKey();
+                methodNode = new Node();
+                expect('(');
+
+                options = {
+                    params: [],
+                    defaultCount: 0,
+                    defaults: [],
+                    firstRestricted: null,
+                    paramSet: {}
+                };
+                if (match(')')) {
+                    tolerateUnexpectedToken(lookahead);
+                } else {
+                    state.allowYield = false;
+                    parseParam(options);
+                    state.allowYield = previousAllowYield;
+                    if (options.defaultCount === 0) {
+                        options.defaults = [];
+                    }
+                }
+                expect(')');
+
+                state.allowYield = false;
+                value = parsePropertyFunction(methodNode, options, false);
+                state.allowYield = previousAllowYield;
+
+                return node.finishProperty('set', key, computed, value, false, false);
+            }
+        } else if (token.type === Token.Punctuator && token.value === '*' && lookaheadPropertyName()) {
+            computed = match('[');
+            key = parseObjectPropertyKey();
+            methodNode = new Node();
+
+            state.allowYield = true;
+            params = parseParams();
+            state.allowYield = previousAllowYield;
+
+            state.allowYield = false;
+            value = parsePropertyFunction(methodNode, params, true);
+            state.allowYield = previousAllowYield;
+
+            return node.finishProperty('init', key, computed, value, true, false);
+        }
+
+        if (key && match('(')) {
+            value = parsePropertyMethodFunction();
+            return node.finishProperty('init', key, computed, value, true, false);
+        }
+
+        // Not a MethodDefinition.
+        return null;
+    }
+
+    function parseObjectProperty(hasProto) {
+        var token = lookahead, node = new Node(), computed, key, maybeMethod, proto, value;
+
+        computed = match('[');
+        if (match('*')) {
+            lex();
+        } else {
+            key = parseObjectPropertyKey();
+        }
+        maybeMethod = tryParseMethodDefinition(token, key, computed, node);
+        if (maybeMethod) {
+            return maybeMethod;
+        }
+
+        if (!key) {
+            throwUnexpectedToken(lookahead);
+        }
+
+        // Check for duplicated __proto__
+        if (!computed) {
+            proto = (key.type === Syntax.Identifier && key.name === '__proto__') ||
+                (key.type === Syntax.Literal && key.value === '__proto__');
+            if (hasProto.value && proto) {
+                tolerateError(Messages.DuplicateProtoProperty);
+            }
+            hasProto.value |= proto;
+        }
+
+        if (match(':')) {
+            lex();
+            value = inheritCoverGrammar(parseAssignmentExpression);
+            return node.finishProperty('init', key, computed, value, false, false);
+        }
+
+        if (token.type === Token.Identifier) {
+            if (match('=')) {
+                firstCoverInitializedNameError = lookahead;
+                lex();
+                value = isolateCoverGrammar(parseAssignmentExpression);
+                return node.finishProperty('init', key, computed,
+                    new WrappingNode(token).finishAssignmentPattern(key, value), false, true);
+            }
+            return node.finishProperty('init', key, computed, key, false, true);
+        }
+
+        throwUnexpectedToken(lookahead);
+    }
+
+    function parseObjectInitializer() {
+        var properties = [], hasProto = {value: false}, node = new Node();
+
+        expect('{');
+
+        while (!match('}')) {
+            properties.push(parseObjectProperty(hasProto));
+
+            if (!match('}')) {
+                expectCommaSeparator();
+            }
+        }
+
+        expect('}');
+
+        return node.finishObjectExpression(properties);
+    }
+
+    function reinterpretExpressionAsPattern(expr) {
+        var i;
+        switch (expr.type) {
+        case Syntax.Identifier:
+        case Syntax.MemberExpression:
+        case Syntax.RestElement:
+        case Syntax.AssignmentPattern:
+            break;
+        case Syntax.SpreadElement:
+            expr.type = Syntax.RestElement;
+            reinterpretExpressionAsPattern(expr.argument);
+            break;
+        case Syntax.ArrayExpression:
+            expr.type = Syntax.ArrayPattern;
+            for (i = 0; i < expr.elements.length; i++) {
+                if (expr.elements[i] !== null) {
+                    reinterpretExpressionAsPattern(expr.elements[i]);
+                }
+            }
+            break;
+        case Syntax.ObjectExpression:
+            expr.type = Syntax.ObjectPattern;
+            for (i = 0; i < expr.properties.length; i++) {
+                reinterpretExpressionAsPattern(expr.properties[i].value);
+            }
+            break;
+        case Syntax.AssignmentExpression:
+            expr.type = Syntax.AssignmentPattern;
+            reinterpretExpressionAsPattern(expr.left);
+            break;
+        default:
+            // Allow other node type for tolerant parsing.
+            break;
+        }
+    }
+
+    // ECMA-262 12.2.9 Template Literals
+
+    function parseTemplateElement(option) {
+        var node, token;
+
+        if (lookahead.type !== Token.Template || (option.head && !lookahead.head)) {
+            throwUnexpectedToken();
+        }
+
+        node = new Node();
+        token = lex();
+
+        return node.finishTemplateElement({ raw: token.value.raw, cooked: token.value.cooked }, token.tail);
+    }
+
+    function parseTemplateLiteral() {
+        var quasi, quasis, expressions, node = new Node();
+
+        quasi = parseTemplateElement({ head: true });
+        quasis = [quasi];
+        expressions = [];
+
+        while (!quasi.tail) {
+            expressions.push(parseExpression());
+            quasi = parseTemplateElement({ head: false });
+            quasis.push(quasi);
+        }
+
+        return node.finishTemplateLiteral(quasis, expressions);
+    }
+
+    // ECMA-262 12.2.10 The Grouping Operator
+
+    function parseGroupExpression() {
+        var expr, expressions, startToken, i, params = [];
+
+        expect('(');
+
+        if (match(')')) {
+            lex();
+            if (!match('=>')) {
+                expect('=>');
+            }
+            return {
+                type: PlaceHolders.ArrowParameterPlaceHolder,
+                params: [],
+                rawParams: []
+            };
+        }
+
+        startToken = lookahead;
+        if (match('...')) {
+            expr = parseRestElement(params);
+            expect(')');
+            if (!match('=>')) {
+                expect('=>');
+            }
+            return {
+                type: PlaceHolders.ArrowParameterPlaceHolder,
+                params: [expr]
+            };
+        }
+
+        isBindingElement = true;
+        expr = inheritCoverGrammar(parseAssignmentExpression);
+
+        if (match(',')) {
+            isAssignmentTarget = false;
+            expressions = [expr];
+
+            while (startIndex < length) {
+                if (!match(',')) {
+                    break;
+                }
+                lex();
+
+                if (match('...')) {
+                    if (!isBindingElement) {
+                        throwUnexpectedToken(lookahead);
+                    }
+                    expressions.push(parseRestElement(params));
+                    expect(')');
+                    if (!match('=>')) {
+                        expect('=>');
+                    }
+                    isBindingElement = false;
+                    for (i = 0; i < expressions.length; i++) {
+                        reinterpretExpressionAsPattern(expressions[i]);
+                    }
+                    return {
+                        type: PlaceHolders.ArrowParameterPlaceHolder,
+                        params: expressions
+                    };
+                }
+
+                expressions.push(inheritCoverGrammar(parseAssignmentExpression));
+            }
+
+            expr = new WrappingNode(startToken).finishSequenceExpression(expressions);
+        }
+
+
+        expect(')');
+
+        if (match('=>')) {
+            if (expr.type === Syntax.Identifier && expr.name === 'yield') {
+                return {
+                    type: PlaceHolders.ArrowParameterPlaceHolder,
+                    params: [expr]
+                };
+            }
+
+            if (!isBindingElement) {
+                throwUnexpectedToken(lookahead);
+            }
+
+            if (expr.type === Syntax.SequenceExpression) {
+                for (i = 0; i < expr.expressions.length; i++) {
+                    reinterpretExpressionAsPattern(expr.expressions[i]);
+                }
+            } else {
+                reinterpretExpressionAsPattern(expr);
+            }
+
+            expr = {
+                type: PlaceHolders.ArrowParameterPlaceHolder,
+                params: expr.type === Syntax.SequenceExpression ? expr.expressions : [expr]
+            };
+        }
+        isBindingElement = false;
+        return expr;
+    }
+
+
+    // ECMA-262 12.2 Primary Expressions
+
+    function parsePrimaryExpression() {
+        var type, token, expr, node;
+
+        if (match('(')) {
+            isBindingElement = false;
+            return inheritCoverGrammar(parseGroupExpression);
+        }
+
+        if (match('[')) {
+            return inheritCoverGrammar(parseArrayInitializer);
+        }
+
+        if (match('{')) {
+            return inheritCoverGrammar(parseObjectInitializer);
+        }
+
+        type = lookahead.type;
+        node = new Node();
+
+        if (type === Token.Identifier) {
+            if (state.sourceType === 'module' && lookahead.value === 'await') {
+                tolerateUnexpectedToken(lookahead);
+            }
+            expr = node.finishIdentifier(lex().value);
+        } else if (type === Token.StringLiteral || type === Token.NumericLiteral) {
+            isAssignmentTarget = isBindingElement = false;
+            if (strict && lookahead.octal) {
+                tolerateUnexpectedToken(lookahead, Messages.StrictOctalLiteral);
+            }
+            expr = node.finishLiteral(lex());
+        } else if (type === Token.Keyword) {
+            if (!strict && state.allowYield && matchKeyword('yield')) {
+                return parseNonComputedProperty();
+            }
+            if (!strict && matchKeyword('let')) {
+                return node.finishIdentifier(lex().value);
+            }
+            isAssignmentTarget = isBindingElement = false;
+            if (matchKeyword('function')) {
+                return parseFunctionExpression();
+            }
+            if (matchKeyword('this')) {
+                lex();
+                return node.finishThisExpression();
+            }
+            if (matchKeyword('class')) {
+                return parseClassExpression();
+            }
+            throwUnexpectedToken(lex());
+        } else if (type === Token.BooleanLiteral) {
+            isAssignmentTarget = isBindingElement = false;
+            token = lex();
+            token.value = (token.value === 'true');
+            expr = node.finishLiteral(token);
+        } else if (type === Token.NullLiteral) {
+            isAssignmentTarget = isBindingElement = false;
+            token = lex();
+            token.value = null;
+            expr = node.finishLiteral(token);
+        } else if (match('/') || match('/=')) {
+            isAssignmentTarget = isBindingElement = false;
+            index = startIndex;
+
+            if (typeof extra.tokens !== 'undefined') {
+                token = collectRegex();
+            } else {
+                token = scanRegExp();
+            }
+            lex();
+            expr = node.finishLiteral(token);
+        } else if (type === Token.Template) {
+            expr = parseTemplateLiteral();
+        } else {
+            throwUnexpectedToken(lex());
+        }
+
+        return expr;
+    }
+
+    // ECMA-262 12.3 Left-Hand-Side Expressions
+
+    function parseArguments() {
+        var args = [], expr;
+
+        expect('(');
+
+        if (!match(')')) {
+            while (startIndex < length) {
+                if (match('...')) {
+                    expr = new Node();
+                    lex();
+                    expr.finishSpreadElement(isolateCoverGrammar(parseAssignmentExpression));
+                } else {
+                    expr = isolateCoverGrammar(parseAssignmentExpression);
+                }
+                args.push(expr);
+                if (match(')')) {
+                    break;
+                }
+                expectCommaSeparator();
+            }
+        }
+
+        expect(')');
+
+        return args;
+    }
+
+    function parseNonComputedProperty() {
+        var token, node = new Node();
+
+        token = lex();
+
+        if (!isIdentifierName(token)) {
+            throwUnexpectedToken(token);
+        }
+
+        return node.finishIdentifier(token.value);
+    }
+
+    function parseNonComputedMember() {
+        expect('.');
+
+        return parseNonComputedProperty();
+    }
+
+    function parseComputedMember() {
+        var expr;
+
+        expect('[');
+
+        expr = isolateCoverGrammar(parseExpression);
+
+        expect(']');
+
+        return expr;
+    }
+
+    // ECMA-262 12.3.3 The new Operator
+
+    function parseNewExpression() {
+        var callee, args, node = new Node();
+
+        expectKeyword('new');
+
+        if (match('.')) {
+            lex();
+            if (lookahead.type === Token.Identifier && lookahead.value === 'target') {
+                if (state.inFunctionBody) {
+                    lex();
+                    return node.finishMetaProperty('new', 'target');
+                }
+            }
+            throwUnexpectedToken(lookahead);
+        }
+
+        callee = isolateCoverGrammar(parseLeftHandSideExpression);
+        args = match('(') ? parseArguments() : [];
+
+        isAssignmentTarget = isBindingElement = false;
+
+        return node.finishNewExpression(callee, args);
+    }
+
+    // ECMA-262 12.3.4 Function Calls
+
+    function parseLeftHandSideExpressionAllowCall() {
+        var quasi, expr, args, property, startToken, previousAllowIn = state.allowIn;
+
+        startToken = lookahead;
+        state.allowIn = true;
+
+        if (matchKeyword('super') && state.inFunctionBody) {
+            expr = new Node();
+            lex();
+            expr = expr.finishSuper();
+            if (!match('(') && !match('.') && !match('[')) {
+                throwUnexpectedToken(lookahead);
+            }
+        } else {
+            expr = inheritCoverGrammar(matchKeyword('new') ? parseNewExpression : parsePrimaryExpression);
+        }
+
+        for (;;) {
+            if (match('.')) {
+                isBindingElement = false;
+                isAssignmentTarget = true;
+                property = parseNonComputedMember();
+                expr = new WrappingNode(startToken).finishMemberExpression('.', expr, property);
+            } else if (match('(')) {
+                isBindingElement = false;
+                isAssignmentTarget = false;
+                args = parseArguments();
+                expr = new WrappingNode(startToken).finishCallExpression(expr, args);
+            } else if (match('[')) {
+                isBindingElement = false;
+                isAssignmentTarget = true;
+                property = parseComputedMember();
+                expr = new WrappingNode(startToken).finishMemberExpression('[', expr, property);
+            } else if (lookahead.type === Token.Template && lookahead.head) {
+                quasi = parseTemplateLiteral();
+                expr = new WrappingNode(startToken).finishTaggedTemplateExpression(expr, quasi);
+            } else {
+                break;
+            }
+        }
+        state.allowIn = previousAllowIn;
+
+        return expr;
+    }
+
+    // ECMA-262 12.3 Left-Hand-Side Expressions
+
+    function parseLeftHandSideExpression() {
+        var quasi, expr, property, startToken;
+        assert(state.allowIn, 'callee of new expression always allow in keyword.');
+
+        startToken = lookahead;
+
+        if (matchKeyword('super') && state.inFunctionBody) {
+            expr = new Node();
+            lex();
+            expr = expr.finishSuper();
+            if (!match('[') && !match('.')) {
+                throwUnexpectedToken(lookahead);
+            }
+        } else {
+            expr = inheritCoverGrammar(matchKeyword('new') ? parseNewExpression : parsePrimaryExpression);
+        }
+
+        for (;;) {
+            if (match('[')) {
+                isBindingElement = false;
+                isAssignmentTarget = true;
+                property = parseComputedMember();
+                expr = new WrappingNode(startToken).finishMemberExpression('[', expr, property);
+            } else if (match('.')) {
+                isBindingElement = false;
+                isAssignmentTarget = true;
+                property = parseNonComputedMember();
+                expr = new WrappingNode(startToken).finishMemberExpression('.', expr, property);
+            } else if (lookahead.type === Token.Template && lookahead.head) {
+                quasi = parseTemplateLiteral();
+                expr = new WrappingNode(startToken).finishTaggedTemplateExpression(expr, quasi);
+            } else {
+                break;
+            }
+        }
+        return expr;
+    }
+
+    // ECMA-262 12.4 Postfix Expressions
+
+    function parsePostfixExpression() {
+        var expr, token, startToken = lookahead;
+
+        expr = inheritCoverGrammar(parseLeftHandSideExpressionAllowCall);
+
+        if (!hasLineTerminator && lookahead.type === Token.Punctuator) {
+            if (match('++') || match('--')) {
+                // ECMA-262 11.3.1, 11.3.2
+                if (strict && expr.type === Syntax.Identifier && isRestrictedWord(expr.name)) {
+                    tolerateError(Messages.StrictLHSPostfix);
+                }
+
+                if (!isAssignmentTarget) {
+                    tolerateError(Messages.InvalidLHSInAssignment);
+                }
+
+                isAssignmentTarget = isBindingElement = false;
+
+                token = lex();
+                expr = new WrappingNode(startToken).finishPostfixExpression(token.value, expr);
+            }
+        }
+
+        return expr;
+    }
+
+    // ECMA-262 12.5 Unary Operators
+
+    function parseUnaryExpression() {
+        var token, expr, startToken;
+
+        if (lookahead.type !== Token.Punctuator && lookahead.type !== Token.Keyword) {
+            expr = parsePostfixExpression();
+        } else if (match('++') || match('--')) {
+            startToken = lookahead;
+            token = lex();
+            expr = inheritCoverGrammar(parseUnaryExpression);
+            // ECMA-262 11.4.4, 11.4.5
+            if (strict && expr.type === Syntax.Identifier && isRestrictedWord(expr.name)) {
+                tolerateError(Messages.StrictLHSPrefix);
+            }
+
+            if (!isAssignmentTarget) {
+                tolerateError(Messages.InvalidLHSInAssignment);
+            }
+            expr = new WrappingNode(startToken).finishUnaryExpression(token.value, expr);
+            isAssignmentTarget = isBindingElement = false;
+        } else if (match('+') || match('-') || match('~') || match('!')) {
+            startToken = lookahead;
+            token = lex();
+            expr = inheritCoverGrammar(parseUnaryExpression);
+            expr = new WrappingNode(startToken).finishUnaryExpression(token.value, expr);
+            isAssignmentTarget = isBindingElement = false;
+        } else if (matchKeyword('delete') || matchKeyword('void') || matchKeyword('typeof')) {
+            startToken = lookahead;
+            token = lex();
+            expr = inheritCoverGrammar(parseUnaryExpression);
+            expr = new WrappingNode(startToken).finishUnaryExpression(token.value, expr);
+            if (strict && expr.operator === 'delete' && expr.argument.type === Syntax.Identifier) {
+                tolerateError(Messages.StrictDelete);
+            }
+            isAssignmentTarget = isBindingElement = false;
+        } else {
+            expr = parsePostfixExpression();
+        }
+
+        return expr;
+    }
+
+    function binaryPrecedence(token, allowIn) {
+        var prec = 0;
+
+        if (token.type !== Token.Punctuator && token.type !== Token.Keyword) {
+            return 0;
+        }
+
+        switch (token.value) {
+        case '||':
+            prec = 1;
+            break;
+
+        case '&&':
+            prec = 2;
+            break;
+
+        case '|':
+            prec = 3;
+            break;
+
+        case '^':
+            prec = 4;
+            break;
+
+        case '&':
+            prec = 5;
+            break;
+
+        case '==':
+        case '!=':
+        case '===':
+        case '!==':
+            prec = 6;
+            break;
+
+        case '<':
+        case '>':
+        case '<=':
+        case '>=':
+        case 'instanceof':
+            prec = 7;
+            break;
+
+        case 'in':
+            prec = allowIn ? 7 : 0;
+            break;
+
+        case '<<':
+        case '>>':
+        case '>>>':
+            prec = 8;
+            break;
+
+        case '+':
+        case '-':
+            prec = 9;
+            break;
+
+        case '*':
+        case '/':
+        case '%':
+            prec = 11;
+            break;
+
+        default:
+            break;
+        }
+
+        return prec;
+    }
+
+    // ECMA-262 12.6 Multiplicative Operators
+    // ECMA-262 12.7 Additive Operators
+    // ECMA-262 12.8 Bitwise Shift Operators
+    // ECMA-262 12.9 Relational Operators
+    // ECMA-262 12.10 Equality Operators
+    // ECMA-262 12.11 Binary Bitwise Operators
+    // ECMA-262 12.12 Binary Logical Operators
+
+    function parseBinaryExpression() {
+        var marker, markers, expr, token, prec, stack, right, operator, left, i;
+
+        marker = lookahead;
+        left = inheritCoverGrammar(parseUnaryExpression);
+
+        token = lookahead;
+        prec = binaryPrecedence(token, state.allowIn);
+        if (prec === 0) {
+            return left;
+        }
+        isAssignmentTarget = isBindingElement = false;
+        token.prec = prec;
+        lex();
+
+        markers = [marker, lookahead];
+        right = isolateCoverGrammar(parseUnaryExpression);
+
+        stack = [left, token, right];
+
+        while ((prec = binaryPrecedence(lookahead, state.allowIn)) > 0) {
+
+            // Reduce: make a binary expression from the three topmost entries.
+            while ((stack.length > 2) && (prec <= stack[stack.length - 2].prec)) {
+                right = stack.pop();
+                operator = stack.pop().value;
+                left = stack.pop();
+                markers.pop();
+                expr = new WrappingNode(markers[markers.length - 1]).finishBinaryExpression(operator, left, right);
+                stack.push(expr);
+            }
+
+            // Shift.
+            token = lex();
+            token.prec = prec;
+            stack.push(token);
+            markers.push(lookahead);
+            expr = isolateCoverGrammar(parseUnaryExpression);
+            stack.push(expr);
+        }
+
+        // Final reduce to clean-up the stack.
+        i = stack.length - 1;
+        expr = stack[i];
+        markers.pop();
+        while (i > 1) {
+            expr = new WrappingNode(markers.pop()).finishBinaryExpression(stack[i - 1].value, stack[i - 2], expr);
+            i -= 2;
+        }
+
+        return expr;
+    }
+
+
+    // ECMA-262 12.13 Conditional Operator
+
+    function parseConditionalExpression() {
+        var expr, previousAllowIn, consequent, alternate, startToken;
+
+        startToken = lookahead;
+
+        expr = inheritCoverGrammar(parseBinaryExpression);
+        if (match('?')) {
+            lex();
+            previousAllowIn = state.allowIn;
+            state.allowIn = true;
+            consequent = isolateCoverGrammar(parseAssignmentExpression);
+            state.allowIn = previousAllowIn;
+            expect(':');
+            alternate = isolateCoverGrammar(parseAssignmentExpression);
+
+            expr = new WrappingNode(startToken).finishConditionalExpression(expr, consequent, alternate);
+            isAssignmentTarget = isBindingElement = false;
+        }
+
+        return expr;
+    }
+
+    // ECMA-262 14.2 Arrow Function Definitions
+
+    function parseConciseBody() {
+        if (match('{')) {
+            return parseFunctionSourceElements();
+        }
+        return isolateCoverGrammar(parseAssignmentExpression);
+    }
+
+    function checkPatternParam(options, param) {
+        var i;
+        switch (param.type) {
+        case Syntax.Identifier:
+            validateParam(options, param, param.name);
+            break;
+        case Syntax.RestElement:
+            checkPatternParam(options, param.argument);
+            break;
+        case Syntax.AssignmentPattern:
+            checkPatternParam(options, param.left);
+            break;
+        case Syntax.ArrayPattern:
+            for (i = 0; i < param.elements.length; i++) {
+                if (param.elements[i] !== null) {
+                    checkPatternParam(options, param.elements[i]);
+                }
+            }
+            break;
+        case Syntax.YieldExpression:
+            break;
+        default:
+            assert(param.type === Syntax.ObjectPattern, 'Invalid type');
+            for (i = 0; i < param.properties.length; i++) {
+                checkPatternParam(options, param.properties[i].value);
+            }
+            break;
+        }
+    }
+    function reinterpretAsCoverFormalsList(expr) {
+        var i, len, param, params, defaults, defaultCount, options, token;
+
+        defaults = [];
+        defaultCount = 0;
+        params = [expr];
+
+        switch (expr.type) {
+        case Syntax.Identifier:
+            break;
+        case PlaceHolders.ArrowParameterPlaceHolder:
+            params = expr.params;
+            break;
+        default:
+            return null;
+        }
+
+        options = {
+            paramSet: {}
+        };
+
+        for (i = 0, len = params.length; i < len; i += 1) {
+            param = params[i];
+            switch (param.type) {
+            case Syntax.AssignmentPattern:
+                params[i] = param.left;
+                if (param.right.type === Syntax.YieldExpression) {
+                    if (param.right.argument) {
+                        throwUnexpectedToken(lookahead);
+                    }
+                    param.right.type = Syntax.Identifier;
+                    param.right.name = 'yield';
+                    delete param.right.argument;
+                    delete param.right.delegate;
+                }
+                defaults.push(param.right);
+                ++defaultCount;
+                checkPatternParam(options, param.left);
+                break;
+            default:
+                checkPatternParam(options, param);
+                params[i] = param;
+                defaults.push(null);
+                break;
+            }
+        }
+
+        if (strict || !state.allowYield) {
+            for (i = 0, len = params.length; i < len; i += 1) {
+                param = params[i];
+                if (param.type === Syntax.YieldExpression) {
+                    throwUnexpectedToken(lookahead);
+                }
+            }
+        }
+
+        if (options.message === Messages.StrictParamDupe) {
+            token = strict ? options.stricted : options.firstRestricted;
+            throwUnexpectedToken(token, options.message);
+        }
+
+        if (defaultCount === 0) {
+            defaults = [];
+        }
+
+        return {
+            params: params,
+            defaults: defaults,
+            stricted: options.stricted,
+            firstRestricted: options.firstRestricted,
+            message: options.message
+        };
+    }
+
+    function parseArrowFunctionExpression(options, node) {
+        var previousStrict, previousAllowYield, body;
+
+        if (hasLineTerminator) {
+            tolerateUnexpectedToken(lookahead);
+        }
+        expect('=>');
+
+        previousStrict = strict;
+        previousAllowYield = state.allowYield;
+        state.allowYield = true;
+
+        body = parseConciseBody();
+
+        if (strict && options.firstRestricted) {
+            throwUnexpectedToken(options.firstRestricted, options.message);
+        }
+        if (strict && options.stricted) {
+            tolerateUnexpectedToken(options.stricted, options.message);
+        }
+
+        strict = previousStrict;
+        state.allowYield = previousAllowYield;
+
+        return node.finishArrowFunctionExpression(options.params, options.defaults, body, body.type !== Syntax.BlockStatement);
+    }
+
+    // ECMA-262 14.4 Yield expression
+
+    function parseYieldExpression() {
+        var argument, expr, delegate, previousAllowYield;
+
+        argument = null;
+        expr = new Node();
+        delegate = false;
+
+        expectKeyword('yield');
+
+        if (!hasLineTerminator) {
+            previousAllowYield = state.allowYield;
+            state.allowYield = false;
+            delegate = match('*');
+            if (delegate) {
+                lex();
+                argument = parseAssignmentExpression();
+            } else {
+                if (!match(';') && !match('}') && !match(')') && lookahead.type !== Token.EOF) {
+                    argument = parseAssignmentExpression();
+                }
+            }
+            state.allowYield = previousAllowYield;
+        }
+
+        return expr.finishYieldExpression(argument, delegate);
+    }
+
+    // ECMA-262 12.14 Assignment Operators
+
+    function parseAssignmentExpression() {
+        var token, expr, right, list, startToken;
+
+        startToken = lookahead;
+        token = lookahead;
+
+        if (!state.allowYield && matchKeyword('yield')) {
+            return parseYieldExpression();
+        }
+
+        expr = parseConditionalExpression();
+
+        if (expr.type === PlaceHolders.ArrowParameterPlaceHolder || match('=>')) {
+            isAssignmentTarget = isBindingElement = false;
+            list = reinterpretAsCoverFormalsList(expr);
+
+            if (list) {
+                firstCoverInitializedNameError = null;
+                return parseArrowFunctionExpression(list, new WrappingNode(startToken));
+            }
+
+            return expr;
+        }
+
+        if (matchAssign()) {
+            if (!isAssignmentTarget) {
+                tolerateError(Messages.InvalidLHSInAssignment);
+            }
+
+            // ECMA-262 12.1.1
+            if (strict && expr.type === Syntax.Identifier) {
+                if (isRestrictedWord(expr.name)) {
+                    tolerateUnexpectedToken(token, Messages.StrictLHSAssignment);
+                }
+                if (isStrictModeReservedWord(expr.name)) {
+                    tolerateUnexpectedToken(token, Messages.StrictReservedWord);
+                }
+            }
+
+            if (!match('=')) {
+                isAssignmentTarget = isBindingElement = false;
+            } else {
+                reinterpretExpressionAsPattern(expr);
+            }
+
+            token = lex();
+            right = isolateCoverGrammar(parseAssignmentExpression);
+            expr = new WrappingNode(startToken).finishAssignmentExpression(token.value, expr, right);
+            firstCoverInitializedNameError = null;
+        }
+
+        return expr;
+    }
+
+    // ECMA-262 12.15 Comma Operator
+
+    function parseExpression() {
+        var expr, startToken = lookahead, expressions;
+
+        expr = isolateCoverGrammar(parseAssignmentExpression);
+
+        if (match(',')) {
+            expressions = [expr];
+
+            while (startIndex < length) {
+                if (!match(',')) {
+                    break;
+                }
+                lex();
+                expressions.push(isolateCoverGrammar(parseAssignmentExpression));
+            }
+
+            expr = new WrappingNode(startToken).finishSequenceExpression(expressions);
+        }
+
+        return expr;
+    }
+
+    // ECMA-262 13.2 Block
+
+    function parseStatementListItem() {
+        if (lookahead.type === Token.Keyword) {
+            switch (lookahead.value) {
+            case 'export':
+                if (state.sourceType !== 'module') {
+                    tolerateUnexpectedToken(lookahead, Messages.IllegalExportDeclaration);
+                }
+                return parseExportDeclaration();
+            case 'import':
+                if (state.sourceType !== 'module') {
+                    tolerateUnexpectedToken(lookahead, Messages.IllegalImportDeclaration);
+                }
+                return parseImportDeclaration();
+            case 'const':
+                return parseLexicalDeclaration({inFor: false});
+            case 'function':
+                return parseFunctionDeclaration(new Node());
+            case 'class':
+                return parseClassDeclaration();
+            }
+        }
+
+        if (matchKeyword('let') && isLexicalDeclaration()) {
+            return parseLexicalDeclaration({inFor: false});
+        }
+
+        return parseStatement();
+    }
+
+    function parseStatementList() {
+        var list = [];
+        while (startIndex < length) {
+            if (match('}')) {
+                break;
+            }
+            list.push(parseStatementListItem());
+        }
+
+        return list;
+    }
+
+    function parseBlock() {
+        var block, node = new Node();
+
+        expect('{');
+
+        block = parseStatementList();
+
+        expect('}');
+
+        return node.finishBlockStatement(block);
+    }
+
+    // ECMA-262 13.3.2 Variable Statement
+
+    function parseVariableIdentifier(kind) {
+        var token, node = new Node();
+
+        token = lex();
+
+        if (token.type === Token.Keyword && token.value === 'yield') {
+            if (strict) {
+                tolerateUnexpectedToken(token, Messages.StrictReservedWord);
+            } if (!state.allowYield) {
+                throwUnexpectedToken(token);
+            }
+        } else if (token.type !== Token.Identifier) {
+            if (strict && token.type === Token.Keyword && isStrictModeReservedWord(token.value)) {
+                tolerateUnexpectedToken(token, Messages.StrictReservedWord);
+            } else {
+                if (strict || token.value !== 'let' || kind !== 'var') {
+                    throwUnexpectedToken(token);
+                }
+            }
+        } else if (state.sourceType === 'module' && token.type === Token.Identifier && token.value === 'await') {
+            tolerateUnexpectedToken(token);
+        }
+
+        return node.finishIdentifier(token.value);
+    }
+
+    function parseVariableDeclaration(options) {
+        var init = null, id, node = new Node(), params = [];
+
+        id = parsePattern(params, 'var');
+
+        // ECMA-262 12.2.1
+        if (strict && isRestrictedWord(id.name)) {
+            tolerateError(Messages.StrictVarName);
+        }
+
+        if (match('=')) {
+            lex();
+            init = isolateCoverGrammar(parseAssignmentExpression);
+        } else if (id.type !== Syntax.Identifier && !options.inFor) {
+            expect('=');
+        }
+
+        return node.finishVariableDeclarator(id, init);
+    }
+
+    function parseVariableDeclarationList(options) {
+        var opt, list;
+
+        opt = { inFor: options.inFor };
+        list = [parseVariableDeclaration(opt)];
+
+        while (match(',')) {
+            lex();
+            list.push(parseVariableDeclaration(opt));
+        }
+
+        return list;
+    }
+
+    function parseVariableStatement(node) {
+        var declarations;
+
+        expectKeyword('var');
+
+        declarations = parseVariableDeclarationList({ inFor: false });
+
+        consumeSemicolon();
+
+        return node.finishVariableDeclaration(declarations);
+    }
+
+    // ECMA-262 13.3.1 Let and Const Declarations
+
+    function parseLexicalBinding(kind, options) {
+        var init = null, id, node = new Node(), params = [];
+
+        id = parsePattern(params, kind);
+
+        // ECMA-262 12.2.1
+        if (strict && id.type === Syntax.Identifier && isRestrictedWord(id.name)) {
+            tolerateError(Messages.StrictVarName);
+        }
+
+        if (kind === 'const') {
+            if (!matchKeyword('in') && !matchContextualKeyword('of')) {
+                expect('=');
+                init = isolateCoverGrammar(parseAssignmentExpression);
+            }
+        } else if ((!options.inFor && id.type !== Syntax.Identifier) || match('=')) {
+            expect('=');
+            init = isolateCoverGrammar(parseAssignmentExpression);
+        }
+
+        return node.finishVariableDeclarator(id, init);
+    }
+
+    function parseBindingList(kind, options) {
+        var list = [parseLexicalBinding(kind, options)];
+
+        while (match(',')) {
+            lex();
+            list.push(parseLexicalBinding(kind, options));
+        }
+
+        return list;
+    }
+
+
+    function tokenizerState() {
+        return {
+            index: index,
+            lineNumber: lineNumber,
+            lineStart: lineStart,
+            hasLineTerminator: hasLineTerminator,
+            lastIndex: lastIndex,
+            lastLineNumber: lastLineNumber,
+            lastLineStart: lastLineStart,
+            startIndex: startIndex,
+            startLineNumber: startLineNumber,
+            startLineStart: startLineStart,
+            lookahead: lookahead,
+            tokenCount: extra.tokens ? extra.tokens.length : 0
+        };
+    }
+
+    function resetTokenizerState(ts) {
+        index = ts.index;
+        lineNumber = ts.lineNumber;
+        lineStart = ts.lineStart;
+        hasLineTerminator = ts.hasLineTerminator;
+        lastIndex = ts.lastIndex;
+        lastLineNumber = ts.lastLineNumber;
+        lastLineStart = ts.lastLineStart;
+        startIndex = ts.startIndex;
+        startLineNumber = ts.startLineNumber;
+        startLineStart = ts.startLineStart;
+        lookahead = ts.lookahead;
+        if (extra.tokens) {
+            extra.tokens.splice(ts.tokenCount, extra.tokens.length);
+        }
+    }
+
+    function isLexicalDeclaration() {
+        var lexical, ts;
+
+        ts = tokenizerState();
+
+        lex();
+        lexical = (lookahead.type === Token.Identifier) || match('[') || match('{') ||
+            matchKeyword('let') || matchKeyword('yield');
+
+        resetTokenizerState(ts);
+
+        return lexical;
+    }
+
+    function parseLexicalDeclaration(options) {
+        var kind, declarations, node = new Node();
+
+        kind = lex().value;
+        assert(kind === 'let' || kind === 'const', 'Lexical declaration must be either let or const');
+
+        declarations = parseBindingList(kind, options);
+
+        consumeSemicolon();
+
+        return node.finishLexicalDeclaration(declarations, kind);
+    }
+
+    function parseRestElement(params) {
+        var param, node = new Node();
+
+        lex();
+
+        if (match('{')) {
+            throwError(Messages.ObjectPatternAsRestParameter);
+        }
+
+        params.push(lookahead);
+
+        param = parseVariableIdentifier();
+
+        if (match('=')) {
+            throwError(Messages.DefaultRestParameter);
+        }
+
+        if (!match(')')) {
+            throwError(Messages.ParameterAfterRestParameter);
+        }
+
+        return node.finishRestElement(param);
+    }
+
+    // ECMA-262 13.4 Empty Statement
+
+    function parseEmptyStatement(node) {
+        expect(';');
+        return node.finishEmptyStatement();
+    }
+
+    // ECMA-262 12.4 Expression Statement
+
+    function parseExpressionStatement(node) {
+        var expr = parseExpression();
+        consumeSemicolon();
+        return node.finishExpressionStatement(expr);
+    }
+
+    // ECMA-262 13.6 If statement
+
+    function parseIfStatement(node) {
+        var test, consequent, alternate;
+
+        expectKeyword('if');
+
+        expect('(');
+
+        test = parseExpression();
+
+        expect(')');
+
+        consequent = parseStatement();
+
+        if (matchKeyword('else')) {
+            lex();
+            alternate = parseStatement();
+        } else {
+            alternate = null;
+        }
+
+        return node.finishIfStatement(test, consequent, alternate);
+    }
+
+    // ECMA-262 13.7 Iteration Statements
+
+    function parseDoWhileStatement(node) {
+        var body, test, oldInIteration;
+
+        expectKeyword('do');
+
+        oldInIteration = state.inIteration;
+        state.inIteration = true;
+
+        body = parseStatement();
+
+        state.inIteration = oldInIteration;
+
+        expectKeyword('while');
+
+        expect('(');
+
+        test = parseExpression();
+
+        expect(')');
+
+        if (match(';')) {
+            lex();
+        }
+
+        return node.finishDoWhileStatement(body, test);
+    }
+
+    function parseWhileStatement(node) {
+        var test, body, oldInIteration;
+
+        expectKeyword('while');
+
+        expect('(');
+
+        test = parseExpression();
+
+        expect(')');
+
+        oldInIteration = state.inIteration;
+        state.inIteration = true;
+
+        body = parseStatement();
+
+        state.inIteration = oldInIteration;
+
+        return node.finishWhileStatement(test, body);
+    }
+
+    function parseForStatement(node) {
+        var init, forIn, initSeq, initStartToken, test, update, left, right, kind, declarations,
+            body, oldInIteration, previousAllowIn = state.allowIn;
+
+        init = test = update = null;
+        forIn = true;
+
+        expectKeyword('for');
+
+        expect('(');
+
+        if (match(';')) {
+            lex();
+        } else {
+            if (matchKeyword('var')) {
+                init = new Node();
+                lex();
+
+                state.allowIn = false;
+                declarations = parseVariableDeclarationList({ inFor: true });
+                state.allowIn = previousAllowIn;
+
+                if (declarations.length === 1 && matchKeyword('in')) {
+                    init = init.finishVariableDeclaration(declarations);
+                    lex();
+                    left = init;
+                    right = parseExpression();
+                    init = null;
+                } else if (declarations.length === 1 && declarations[0].init === null && matchContextualKeyword('of')) {
+                    init = init.finishVariableDeclaration(declarations);
+                    lex();
+                    left = init;
+                    right = parseAssignmentExpression();
+                    init = null;
+                    forIn = false;
+                } else {
+                    init = init.finishVariableDeclaration(declarations);
+                    expect(';');
+                }
+            } else if (matchKeyword('const') || matchKeyword('let')) {
+                init = new Node();
+                kind = lex().value;
+
+                if (!strict && lookahead.value === 'in') {
+                    init = init.finishIdentifier(kind);
+                    lex();
+                    left = init;
+                    right = parseExpression();
+                    init = null;
+                } else {
+                    state.allowIn = false;
+                    declarations = parseBindingList(kind, {inFor: true});
+                    state.allowIn = previousAllowIn;
+
+                    if (declarations.length === 1 && declarations[0].init === null && matchKeyword('in')) {
+                        init = init.finishLexicalDeclaration(declarations, kind);
+                        lex();
+                        left = init;
+                        right = parseExpression();
+                        init = null;
+                    } else if (declarations.length === 1 && declarations[0].init === null && matchContextualKeyword('of')) {
+                        init = init.finishLexicalDeclaration(declarations, kind);
+                        lex();
+                        left = init;
+                        right = parseAssignmentExpression();
+                        init = null;
+                        forIn = false;
+                    } else {
+                        consumeSemicolon();
+                        init = init.finishLexicalDeclaration(declarations, kind);
+                    }
+                }
+            } else {
+                initStartToken = lookahead;
+                state.allowIn = false;
+                init = inheritCoverGrammar(parseAssignmentExpression);
+                state.allowIn = previousAllowIn;
+
+                if (matchKeyword('in')) {
+                    if (!isAssignmentTarget) {
+                        tolerateError(Messages.InvalidLHSInForIn);
+                    }
+
+                    lex();
+                    reinterpretExpressionAsPattern(init);
+                    left = init;
+                    right = parseExpression();
+                    init = null;
+                } else if (matchContextualKeyword('of')) {
+                    if (!isAssignmentTarget) {
+                        tolerateError(Messages.InvalidLHSInForLoop);
+                    }
+
+                    lex();
+                    reinterpretExpressionAsPattern(init);
+                    left = init;
+                    right = parseAssignmentExpression();
+                    init = null;
+                    forIn = false;
+                } else {
+                    if (match(',')) {
+                        initSeq = [init];
+                        while (match(',')) {
+                            lex();
+                            initSeq.push(isolateCoverGrammar(parseAssignmentExpression));
+                        }
+                        init = new WrappingNode(initStartToken).finishSequenceExpression(initSeq);
+                    }
+                    expect(';');
+                }
+            }
+        }
+
+        if (typeof left === 'undefined') {
+
+            if (!match(';')) {
+                test = parseExpression();
+            }
+            expect(';');
+
+            if (!match(')')) {
+                update = parseExpression();
+            }
+        }
+
+        expect(')');
+
+        oldInIteration = state.inIteration;
+        state.inIteration = true;
+
+        body = isolateCoverGrammar(parseStatement);
+
+        state.inIteration = oldInIteration;
+
+        return (typeof left === 'undefined') ?
+                node.finishForStatement(init, test, update, body) :
+                forIn ? node.finishForInStatement(left, right, body) :
+                    node.finishForOfStatement(left, right, body);
+    }
+
+    // ECMA-262 13.8 The continue statement
+
+    function parseContinueStatement(node) {
+        var label = null, key;
+
+        expectKeyword('continue');
+
+        // Optimize the most common form: 'continue;'.
+        if (source.charCodeAt(startIndex) === 0x3B) {
+            lex();
+
+            if (!state.inIteration) {
+                throwError(Messages.IllegalContinue);
+            }
+
+            return node.finishContinueStatement(null);
+        }
+
+        if (hasLineTerminator) {
+            if (!state.inIteration) {
+                throwError(Messages.IllegalContinue);
+            }
+
+            return node.finishContinueStatement(null);
+        }
+
+        if (lookahead.type === Token.Identifier) {
+            label = parseVariableIdentifier();
+
+            key = '$' + label.name;
+            if (!Object.prototype.hasOwnProperty.call(state.labelSet, key)) {
+                throwError(Messages.UnknownLabel, label.name);
+            }
+        }
+
+        consumeSemicolon();
+
+        if (label === null && !state.inIteration) {
+            throwError(Messages.IllegalContinue);
+        }
+
+        return node.finishContinueStatement(label);
+    }
+
+    // ECMA-262 13.9 The break statement
+
+    function parseBreakStatement(node) {
+        var label = null, key;
+
+        expectKeyword('break');
+
+        // Catch the very common case first: immediately a semicolon (U+003B).
+        if (source.charCodeAt(lastIndex) === 0x3B) {
+            lex();
+
+            if (!(state.inIteration || state.inSwitch)) {
+                throwError(Messages.IllegalBreak);
+            }
+
+            return node.finishBreakStatement(null);
+        }
+
+        if (hasLineTerminator) {
+            if (!(state.inIteration || state.inSwitch)) {
+                throwError(Messages.IllegalBreak);
+            }
+        } else if (lookahead.type === Token.Identifier) {
+            label = parseVariableIdentifier();
+
+            key = '$' + label.name;
+            if (!Object.prototype.hasOwnProperty.call(state.labelSet, key)) {
+                throwError(Messages.UnknownLabel, label.name);
+            }
+        }
+
+        consumeSemicolon();
+
+        if (label === null && !(state.inIteration || state.inSwitch)) {
+            throwError(Messages.IllegalBreak);
+        }
+
+        return node.finishBreakStatement(label);
+    }
+
+    // ECMA-262 13.10 The return statement
+
+    function parseReturnStatement(node) {
+        var argument = null;
+
+        expectKeyword('return');
+
+        if (!state.inFunctionBody) {
+            tolerateError(Messages.IllegalReturn);
+        }
+
+        // 'return' followed by a space and an identifier is very common.
+        if (source.charCodeAt(lastIndex) === 0x20) {
+            if (isIdentifierStart(source.charCodeAt(lastIndex + 1))) {
+                argument = parseExpression();
+                consumeSemicolon();
+                return node.finishReturnStatement(argument);
+            }
+        }
+
+        if (hasLineTerminator) {
+            // HACK
+            return node.finishReturnStatement(null);
+        }
+
+        if (!match(';')) {
+            if (!match('}') && lookahead.type !== Token.EOF) {
+                argument = parseExpression();
+            }
+        }
+
+        consumeSemicolon();
+
+        return node.finishReturnStatement(argument);
+    }
+
+    // ECMA-262 13.11 The with statement
+
+    function parseWithStatement(node) {
+        var object, body;
+
+        if (strict) {
+            tolerateError(Messages.StrictModeWith);
+        }
+
+        expectKeyword('with');
+
+        expect('(');
+
+        object = parseExpression();
+
+        expect(')');
+
+        body = parseStatement();
+
+        return node.finishWithStatement(object, body);
+    }
+
+    // ECMA-262 13.12 The switch statement
+
+    function parseSwitchCase() {
+        var test, consequent = [], statement, node = new Node();
+
+        if (matchKeyword('default')) {
+            lex();
+            test = null;
+        } else {
+            expectKeyword('case');
+            test = parseExpression();
+        }
+        expect(':');
+
+        while (startIndex < length) {
+            if (match('}') || matchKeyword('default') || matchKeyword('case')) {
+                break;
+            }
+            statement = parseStatementListItem();
+            consequent.push(statement);
+        }
+
+        return node.finishSwitchCase(test, consequent);
+    }
+
+    function parseSwitchStatement(node) {
+        var discriminant, cases, clause, oldInSwitch, defaultFound;
+
+        expectKeyword('switch');
+
+        expect('(');
+
+        discriminant = parseExpression();
+
+        expect(')');
+
+        expect('{');
+
+        cases = [];
+
+        if (match('}')) {
+            lex();
+            return node.finishSwitchStatement(discriminant, cases);
+        }
+
+        oldInSwitch = state.inSwitch;
+        state.inSwitch = true;
+        defaultFound = false;
+
+        while (startIndex < length) {
+            if (match('}')) {
+                break;
+            }
+            clause = parseSwitchCase();
+            if (clause.test === null) {
+                if (defaultFound) {
+                    throwError(Messages.MultipleDefaultsInSwitch);
+                }
+                defaultFound = true;
+            }
+            cases.push(clause);
+        }
+
+        state.inSwitch = oldInSwitch;
+
+        expect('}');
+
+        return node.finishSwitchStatement(discriminant, cases);
+    }
+
+    // ECMA-262 13.14 The throw statement
+
+    function parseThrowStatement(node) {
+        var argument;
+
+        expectKeyword('throw');
+
+        if (hasLineTerminator) {
+            throwError(Messages.NewlineAfterThrow);
+        }
+
+        argument = parseExpression();
+
+        consumeSemicolon();
+
+        return node.finishThrowStatement(argument);
+    }
+
+    // ECMA-262 13.15 The try statement
+
+    function parseCatchClause() {
+        var param, params = [], paramMap = {}, key, i, body, node = new Node();
+
+        expectKeyword('catch');
+
+        expect('(');
+        if (match(')')) {
+            throwUnexpectedToken(lookahead);
+        }
+
+        param = parsePattern(params);
+        for (i = 0; i < params.length; i++) {
+            key = '$' + params[i].value;
+            if (Object.prototype.hasOwnProperty.call(paramMap, key)) {
+                tolerateError(Messages.DuplicateBinding, params[i].value);
+            }
+            paramMap[key] = true;
+        }
+
+        // ECMA-262 12.14.1
+        if (strict && isRestrictedWord(param.name)) {
+            tolerateError(Messages.StrictCatchVariable);
+        }
+
+        expect(')');
+        body = parseBlock();
+        return node.finishCatchClause(param, body);
+    }
+
+    function parseTryStatement(node) {
+        var block, handler = null, finalizer = null;
+
+        expectKeyword('try');
+
+        block = parseBlock();
+
+        if (matchKeyword('catch')) {
+            handler = parseCatchClause();
+        }
+
+        if (matchKeyword('finally')) {
+            lex();
+            finalizer = parseBlock();
+        }
+
+        if (!handler && !finalizer) {
+            throwError(Messages.NoCatchOrFinally);
+        }
+
+        return node.finishTryStatement(block, handler, finalizer);
+    }
+
+    // ECMA-262 13.16 The debugger statement
+
+    function parseDebuggerStatement(node) {
+        expectKeyword('debugger');
+
+        consumeSemicolon();
+
+        return node.finishDebuggerStatement();
+    }
+
+    // 13 Statements
+
+    function parseStatement() {
+        var type = lookahead.type,
+            expr,
+            labeledBody,
+            key,
+            node;
+
+        if (type === Token.EOF) {
+            throwUnexpectedToken(lookahead);
+        }
+
+        if (type === Token.Punctuator && lookahead.value === '{') {
+            return parseBlock();
+        }
+        isAssignmentTarget = isBindingElement = true;
+        node = new Node();
+
+        if (type === Token.Punctuator) {
+            switch (lookahead.value) {
+            case ';':
+                return parseEmptyStatement(node);
+            case '(':
+                return parseExpressionStatement(node);
+            default:
+                break;
+            }
+        } else if (type === Token.Keyword) {
+            switch (lookahead.value) {
+            case 'break':
+                return parseBreakStatement(node);
+            case 'continue':
+                return parseContinueStatement(node);
+            case 'debugger':
+                return parseDebuggerStatement(node);
+            case 'do':
+                return parseDoWhileStatement(node);
+            case 'for':
+                return parseForStatement(node);
+            case 'function':
+                return parseFunctionDeclaration(node);
+            case 'if':
+                return parseIfStatement(node);
+            case 'return':
+                return parseReturnStatement(node);
+            case 'switch':
+                return parseSwitchStatement(node);
+            case 'throw':
+                return parseThrowStatement(node);
+            case 'try':
+                return parseTryStatement(node);
+            case 'var':
+                return parseVariableStatement(node);
+            case 'while':
+                return parseWhileStatement(node);
+            case 'with':
+                return parseWithStatement(node);
+            default:
+                break;
+            }
+        }
+
+        expr = parseExpression();
+
+        // ECMA-262 12.12 Labelled Statements
+        if ((expr.type === Syntax.Identifier) && match(':')) {
+            lex();
+
+            key = '$' + expr.name;
+            if (Object.prototype.hasOwnProperty.call(state.labelSet, key)) {
+                throwError(Messages.Redeclaration, 'Label', expr.name);
+            }
+
+            state.labelSet[key] = true;
+            labeledBody = parseStatement();
+            delete state.labelSet[key];
+            return node.finishLabeledStatement(expr, labeledBody);
+        }
+
+        consumeSemicolon();
+
+        return node.finishExpressionStatement(expr);
+    }
+
+    // ECMA-262 14.1 Function Definition
+
+    function parseFunctionSourceElements() {
+        var statement, body = [], token, directive, firstRestricted,
+            oldLabelSet, oldInIteration, oldInSwitch, oldInFunctionBody,
+            node = new Node();
+
+        expect('{');
+
+        while (startIndex < length) {
+            if (lookahead.type !== Token.StringLiteral) {
+                break;
+            }
+            token = lookahead;
+
+            statement = parseStatementListItem();
+            body.push(statement);
+            if (statement.expression.type !== Syntax.Literal) {
+                // this is not directive
+                break;
+            }
+            directive = source.slice(token.start + 1, token.end - 1);
+            if (directive === 'use strict') {
+                strict = true;
+                if (firstRestricted) {
+                    tolerateUnexpectedToken(firstRestricted, Messages.StrictOctalLiteral);
+                }
+            } else {
+                if (!firstRestricted && token.octal) {
+                    firstRestricted = token;
+                }
+            }
+        }
+
+        oldLabelSet = state.labelSet;
+        oldInIteration = state.inIteration;
+        oldInSwitch = state.inSwitch;
+        oldInFunctionBody = state.inFunctionBody;
+
+        state.labelSet = {};
+        state.inIteration = false;
+        state.inSwitch = false;
+        state.inFunctionBody = true;
+
+        while (startIndex < length) {
+            if (match('}')) {
+                break;
+            }
+            body.push(parseStatementListItem());
+        }
+
+        expect('}');
+
+        state.labelSet = oldLabelSet;
+        state.inIteration = oldInIteration;
+        state.inSwitch = oldInSwitch;
+        state.inFunctionBody = oldInFunctionBody;
+
+        return node.finishBlockStatement(body);
+    }
+
+    function validateParam(options, param, name) {
+        var key = '$' + name;
+        if (strict) {
+            if (isRestrictedWord(name)) {
+                options.stricted = param;
+                options.message = Messages.StrictParamName;
+            }
+            if (Object.prototype.hasOwnProperty.call(options.paramSet, key)) {
+                options.stricted = param;
+                options.message = Messages.StrictParamDupe;
+            }
+        } else if (!options.firstRestricted) {
+            if (isRestrictedWord(name)) {
+                options.firstRestricted = param;
+                options.message = Messages.StrictParamName;
+            } else if (isStrictModeReservedWord(name)) {
+                options.firstRestricted = param;
+                options.message = Messages.StrictReservedWord;
+            } else if (Object.prototype.hasOwnProperty.call(options.paramSet, key)) {
+                options.stricted = param;
+                options.message = Messages.StrictParamDupe;
+            }
+        }
+        options.paramSet[key] = true;
+    }
+
+    function parseParam(options) {
+        var token, param, params = [], i, def;
+
+        token = lookahead;
+        if (token.value === '...') {
+            param = parseRestElement(params);
+            validateParam(options, param.argument, param.argument.name);
+            options.params.push(param);
+            options.defaults.push(null);
+            return false;
+        }
+
+        param = parsePatternWithDefault(params);
+        for (i = 0; i < params.length; i++) {
+            validateParam(options, params[i], params[i].value);
+        }
+
+        if (param.type === Syntax.AssignmentPattern) {
+            def = param.right;
+            param = param.left;
+            ++options.defaultCount;
+        }
+
+        options.params.push(param);
+        options.defaults.push(def);
+
+        return !match(')');
+    }
+
+    function parseParams(firstRestricted) {
+        var options;
+
+        options = {
+            params: [],
+            defaultCount: 0,
+            defaults: [],
+            firstRestricted: firstRestricted
+        };
+
+        expect('(');
+
+        if (!match(')')) {
+            options.paramSet = {};
+            while (startIndex < length) {
+                if (!parseParam(options)) {
+                    break;
+                }
+                expect(',');
+            }
+        }
+
+        expect(')');
+
+        if (options.defaultCount === 0) {
+            options.defaults = [];
+        }
+
+        return {
+            params: options.params,
+            defaults: options.defaults,
+            stricted: options.stricted,
+            firstRestricted: options.firstRestricted,
+            message: options.message
+        };
+    }
+
+    function parseFunctionDeclaration(node, identifierIsOptional) {
+        var id = null, params = [], defaults = [], body, token, stricted, tmp, firstRestricted, message, previousStrict,
+            isGenerator, previousAllowYield;
+
+        previousAllowYield = state.allowYield;
+
+        expectKeyword('function');
+
+        isGenerator = match('*');
+        if (isGenerator) {
+            lex();
+        }
+
+        if (!identifierIsOptional || !match('(')) {
+            token = lookahead;
+            id = parseVariableIdentifier();
+            if (strict) {
+                if (isRestrictedWord(token.value)) {
+                    tolerateUnexpectedToken(token, Messages.StrictFunctionName);
+                }
+            } else {
+                if (isRestrictedWord(token.value)) {
+                    firstRestricted = token;
+                    message = Messages.StrictFunctionName;
+                } else if (isStrictModeReservedWord(token.value)) {
+                    firstRestricted = token;
+                    message = Messages.StrictReservedWord;
+                }
+            }
+        }
+
+        state.allowYield = !isGenerator;
+        tmp = parseParams(firstRestricted);
+        params = tmp.params;
+        defaults = tmp.defaults;
+        stricted = tmp.stricted;
+        firstRestricted = tmp.firstRestricted;
+        if (tmp.message) {
+            message = tmp.message;
+        }
+
+
+        previousStrict = strict;
+        body = parseFunctionSourceElements();
+        if (strict && firstRestricted) {
+            throwUnexpectedToken(firstRestricted, message);
+        }
+        if (strict && stricted) {
+            tolerateUnexpectedToken(stricted, message);
+        }
+
+        strict = previousStrict;
+        state.allowYield = previousAllowYield;
+
+        return node.finishFunctionDeclaration(id, params, defaults, body, isGenerator);
+    }
+
+    function parseFunctionExpression() {
+        var token, id = null, stricted, firstRestricted, message, tmp,
+            params = [], defaults = [], body, previousStrict, node = new Node(),
+            isGenerator, previousAllowYield;
+
+        previousAllowYield = state.allowYield;
+
+        expectKeyword('function');
+
+        isGenerator = match('*');
+        if (isGenerator) {
+            lex();
+        }
+
+        state.allowYield = !isGenerator;
+        if (!match('(')) {
+            token = lookahead;
+            id = (!strict && !isGenerator && matchKeyword('yield')) ? parseNonComputedProperty() : parseVariableIdentifier();
+            if (strict) {
+                if (isRestrictedWord(token.value)) {
+                    tolerateUnexpectedToken(token, Messages.StrictFunctionName);
+                }
+            } else {
+                if (isRestrictedWord(token.value)) {
+                    firstRestricted = token;
+                    message = Messages.StrictFunctionName;
+                } else if (isStrictModeReservedWord(token.value)) {
+                    firstRestricted = token;
+                    message = Messages.StrictReservedWord;
+                }
+            }
+        }
+
+        tmp = parseParams(firstRestricted);
+        params = tmp.params;
+        defaults = tmp.defaults;
+        stricted = tmp.stricted;
+        firstRestricted = tmp.firstRestricted;
+        if (tmp.message) {
+            message = tmp.message;
+        }
+
+        previousStrict = strict;
+        body = parseFunctionSourceElements();
+        if (strict && firstRestricted) {
+            throwUnexpectedToken(firstRestricted, message);
+        }
+        if (strict && stricted) {
+            tolerateUnexpectedToken(stricted, message);
+        }
+        strict = previousStrict;
+        state.allowYield = previousAllowYield;
+
+        return node.finishFunctionExpression(id, params, defaults, body, isGenerator);
+    }
+
+    // ECMA-262 14.5 Class Definitions
+
+    function parseClassBody() {
+        var classBody, token, isStatic, hasConstructor = false, body, method, computed, key;
+
+        classBody = new Node();
+
+        expect('{');
+        body = [];
+        while (!match('}')) {
+            if (match(';')) {
+                lex();
+            } else {
+                method = new Node();
+                token = lookahead;
+                isStatic = false;
+                computed = match('[');
+                if (match('*')) {
+                    lex();
+                } else {
+                    key = parseObjectPropertyKey();
+                    if (key.name === 'static' && (lookaheadPropertyName() || match('*'))) {
+                        token = lookahead;
+                        isStatic = true;
+                        computed = match('[');
+                        if (match('*')) {
+                            lex();
+                        } else {
+                            key = parseObjectPropertyKey();
+                        }
+                    }
+                }
+                method = tryParseMethodDefinition(token, key, computed, method);
+                if (method) {
+                    method['static'] = isStatic; // jscs:ignore requireDotNotation
+                    if (method.kind === 'init') {
+                        method.kind = 'method';
+                    }
+                    if (!isStatic) {
+                        if (!method.computed && (method.key.name || method.key.value.toString()) === 'constructor') {
+                            if (method.kind !== 'method' || !method.method || method.value.generator) {
+                                throwUnexpectedToken(token, Messages.ConstructorSpecialMethod);
+                            }
+                            if (hasConstructor) {
+                                throwUnexpectedToken(token, Messages.DuplicateConstructor);
+                            } else {
+                                hasConstructor = true;
+                            }
+                            method.kind = 'constructor';
+                        }
+                    } else {
+                        if (!method.computed && (method.key.name || method.key.value.toString()) === 'prototype') {
+                            throwUnexpectedToken(token, Messages.StaticPrototype);
+                        }
+                    }
+                    method.type = Syntax.MethodDefinition;
+                    delete method.method;
+                    delete method.shorthand;
+                    body.push(method);
+                } else {
+                    throwUnexpectedToken(lookahead);
+                }
+            }
+        }
+        lex();
+        return classBody.finishClassBody(body);
+    }
+
+    function parseClassDeclaration(identifierIsOptional) {
+        var id = null, superClass = null, classNode = new Node(), classBody, previousStrict = strict;
+        strict = true;
+
+        expectKeyword('class');
+
+        if (!identifierIsOptional || lookahead.type === Token.Identifier) {
+            id = parseVariableIdentifier();
+        }
+
+        if (matchKeyword('extends')) {
+            lex();
+            superClass = isolateCoverGrammar(parseLeftHandSideExpressionAllowCall);
+        }
+        classBody = parseClassBody();
+        strict = previousStrict;
+
+        return classNode.finishClassDeclaration(id, superClass, classBody);
+    }
+
+    function parseClassExpression() {
+        var id = null, superClass = null, classNode = new Node(), classBody, previousStrict = strict;
+        strict = true;
+
+        expectKeyword('class');
+
+        if (lookahead.type === Token.Identifier) {
+            id = parseVariableIdentifier();
+        }
+
+        if (matchKeyword('extends')) {
+            lex();
+            superClass = isolateCoverGrammar(parseLeftHandSideExpressionAllowCall);
+        }
+        classBody = parseClassBody();
+        strict = previousStrict;
+
+        return classNode.finishClassExpression(id, superClass, classBody);
+    }
+
+    // ECMA-262 15.2 Modules
+
+    function parseModuleSpecifier() {
+        var node = new Node();
+
+        if (lookahead.type !== Token.StringLiteral) {
+            throwError(Messages.InvalidModuleSpecifier);
+        }
+        return node.finishLiteral(lex());
+    }
+
+    // ECMA-262 15.2.3 Exports
+
+    function parseExportSpecifier() {
+        var exported, local, node = new Node(), def;
+        if (matchKeyword('default')) {
+            // export {default} from 'something';
+            def = new Node();
+            lex();
+            local = def.finishIdentifier('default');
+        } else {
+            local = parseVariableIdentifier();
+        }
+        if (matchContextualKeyword('as')) {
+            lex();
+            exported = parseNonComputedProperty();
+        }
+        return node.finishExportSpecifier(local, exported);
+    }
+
+    function parseExportNamedDeclaration(node) {
+        var declaration = null,
+            isExportFromIdentifier,
+            src = null, specifiers = [];
+
+        // non-default export
+        if (lookahead.type === Token.Keyword) {
+            // covers:
+            // export var f = 1;
+            switch (lookahead.value) {
+                case 'let':
+                case 'const':
+                    declaration = parseLexicalDeclaration({inFor: false});
+                    return node.finishExportNamedDeclaration(declaration, specifiers, null);
+                case 'var':
+                case 'class':
+                case 'function':
+                    declaration = parseStatementListItem();
+                    return node.finishExportNamedDeclaration(declaration, specifiers, null);
+            }
+        }
+
+        expect('{');
+        while (!match('}')) {
+            isExportFromIdentifier = isExportFromIdentifier || matchKeyword('default');
+            specifiers.push(parseExportSpecifier());
+            if (!match('}')) {
+                expect(',');
+                if (match('}')) {
+                    break;
+                }
+            }
+        }
+        expect('}');
+
+        if (matchContextualKeyword('from')) {
+            // covering:
+            // export {default} from 'foo';
+            // export {foo} from 'foo';
+            lex();
+            src = parseModuleSpecifier();
+            consumeSemicolon();
+        } else if (isExportFromIdentifier) {
+            // covering:
+            // export {default}; // missing fromClause
+            throwError(lookahead.value ?
+                    Messages.UnexpectedToken : Messages.MissingFromClause, lookahead.value);
+        } else {
+            // cover
+            // export {foo};
+            consumeSemicolon();
+        }
+        return node.finishExportNamedDeclaration(declaration, specifiers, src);
+    }
+
+    function parseExportDefaultDeclaration(node) {
+        var declaration = null,
+            expression = null;
+
+        // covers:
+        // export default ...
+        expectKeyword('default');
+
+        if (matchKeyword('function')) {
+            // covers:
+            // export default function foo () {}
+            // export default function () {}
+            declaration = parseFunctionDeclaration(new Node(), true);
+            return node.finishExportDefaultDeclaration(declaration);
+        }
+        if (matchKeyword('class')) {
+            declaration = parseClassDeclaration(true);
+            return node.finishExportDefaultDeclaration(declaration);
+        }
+
+        if (matchContextualKeyword('from')) {
+            throwError(Messages.UnexpectedToken, lookahead.value);
+        }
+
+        // covers:
+        // export default {};
+        // export default [];
+        // export default (1 + 2);
+        if (match('{')) {
+            expression = parseObjectInitializer();
+        } else if (match('[')) {
+            expression = parseArrayInitializer();
+        } else {
+            expression = parseAssignmentExpression();
+        }
+        consumeSemicolon();
+        return node.finishExportDefaultDeclaration(expression);
+    }
+
+    function parseExportAllDeclaration(node) {
+        var src;
+
+        // covers:
+        // export * from 'foo';
+        expect('*');
+        if (!matchContextualKeyword('from')) {
+            throwError(lookahead.value ?
+                    Messages.UnexpectedToken : Messages.MissingFromClause, lookahead.value);
+        }
+        lex();
+        src = parseModuleSpecifier();
+        consumeSemicolon();
+
+        return node.finishExportAllDeclaration(src);
+    }
+
+    function parseExportDeclaration() {
+        var node = new Node();
+        if (state.inFunctionBody) {
+            throwError(Messages.IllegalExportDeclaration);
+        }
+
+        expectKeyword('export');
+
+        if (matchKeyword('default')) {
+            return parseExportDefaultDeclaration(node);
+        }
+        if (match('*')) {
+            return parseExportAllDeclaration(node);
+        }
+        return parseExportNamedDeclaration(node);
+    }
+
+    // ECMA-262 15.2.2 Imports
+
+    function parseImportSpecifier() {
+        // import {<foo as bar>} ...;
+        var local, imported, node = new Node();
+
+        imported = parseNonComputedProperty();
+        if (matchContextualKeyword('as')) {
+            lex();
+            local = parseVariableIdentifier();
+        }
+
+        return node.finishImportSpecifier(local, imported);
+    }
+
+    function parseNamedImports() {
+        var specifiers = [];
+        // {foo, bar as bas}
+        expect('{');
+        while (!match('}')) {
+            specifiers.push(parseImportSpecifier());
+            if (!match('}')) {
+                expect(',');
+                if (match('}')) {
+                    break;
+                }
+            }
+        }
+        expect('}');
+        return specifiers;
+    }
+
+    function parseImportDefaultSpecifier() {
+        // import <foo> ...;
+        var local, node = new Node();
+
+        local = parseNonComputedProperty();
+
+        return node.finishImportDefaultSpecifier(local);
+    }
+
+    function parseImportNamespaceSpecifier() {
+        // import <* as foo> ...;
+        var local, node = new Node();
+
+        expect('*');
+        if (!matchContextualKeyword('as')) {
+            throwError(Messages.NoAsAfterImportNamespace);
+        }
+        lex();
+        local = parseNonComputedProperty();
+
+        return node.finishImportNamespaceSpecifier(local);
+    }
+
+    function parseImportDeclaration() {
+        var specifiers = [], src, node = new Node();
+
+        if (state.inFunctionBody) {
+            throwError(Messages.IllegalImportDeclaration);
+        }
+
+        expectKeyword('import');
+
+        if (lookahead.type === Token.StringLiteral) {
+            // import 'foo';
+            src = parseModuleSpecifier();
+        } else {
+
+            if (match('{')) {
+                // import {bar}
+                specifiers = specifiers.concat(parseNamedImports());
+            } else if (match('*')) {
+                // import * as foo
+                specifiers.push(parseImportNamespaceSpecifier());
+            } else if (isIdentifierName(lookahead) && !matchKeyword('default')) {
+                // import foo
+                specifiers.push(parseImportDefaultSpecifier());
+                if (match(',')) {
+                    lex();
+                    if (match('*')) {
+                        // import foo, * as foo
+                        specifiers.push(parseImportNamespaceSpecifier());
+                    } else if (match('{')) {
+                        // import foo, {bar}
+                        specifiers = specifiers.concat(parseNamedImports());
+                    } else {
+                        throwUnexpectedToken(lookahead);
+                    }
+                }
+            } else {
+                throwUnexpectedToken(lex());
+            }
+
+            if (!matchContextualKeyword('from')) {
+                throwError(lookahead.value ?
+                        Messages.UnexpectedToken : Messages.MissingFromClause, lookahead.value);
+            }
+            lex();
+            src = parseModuleSpecifier();
+        }
+
+        consumeSemicolon();
+        return node.finishImportDeclaration(specifiers, src);
+    }
+
+    // ECMA-262 15.1 Scripts
+
+    function parseScriptBody() {
+        var statement, body = [], token, directive, firstRestricted;
+
+        while (startIndex < length) {
+            token = lookahead;
+            if (token.type !== Token.StringLiteral) {
+                break;
+            }
+
+            statement = parseStatementListItem();
+            body.push(statement);
+            if (statement.expression.type !== Syntax.Literal) {
+                // this is not directive
+                break;
+            }
+            directive = source.slice(token.start + 1, token.end - 1);
+            if (directive === 'use strict') {
+                strict = true;
+                if (firstRestricted) {
+                    tolerateUnexpectedToken(firstRestricted, Messages.StrictOctalLiteral);
+                }
+            } else {
+                if (!firstRestricted && token.octal) {
+                    firstRestricted = token;
+                }
+            }
+        }
+
+        while (startIndex < length) {
+            statement = parseStatementListItem();
+            /* istanbul ignore if */
+            if (typeof statement === 'undefined') {
+                break;
+            }
+            body.push(statement);
+        }
+        return body;
+    }
+
+    function parseProgram() {
+        var body, node;
+
+        peek();
+        node = new Node();
+
+        body = parseScriptBody();
+        return node.finishProgram(body, state.sourceType);
+    }
+
+    function filterTokenLocation() {
+        var i, entry, token, tokens = [];
+
+        for (i = 0; i < extra.tokens.length; ++i) {
+            entry = extra.tokens[i];
+            token = {
+                type: entry.type,
+                value: entry.value
+            };
+            if (entry.regex) {
+                token.regex = {
+                    pattern: entry.regex.pattern,
+                    flags: entry.regex.flags
+                };
+            }
+            if (extra.range) {
+                token.range = entry.range;
+            }
+            if (extra.loc) {
+                token.loc = entry.loc;
+            }
+            tokens.push(token);
+        }
+
+        extra.tokens = tokens;
+    }
+
+    function tokenize(code, options, delegate) {
+        var toString,
+            tokens;
+
+        toString = String;
+        if (typeof code !== 'string' && !(code instanceof String)) {
+            code = toString(code);
+        }
+
+        source = code;
+        index = 0;
+        lineNumber = (source.length > 0) ? 1 : 0;
+        lineStart = 0;
+        startIndex = index;
+        startLineNumber = lineNumber;
+        startLineStart = lineStart;
+        length = source.length;
+        lookahead = null;
+        state = {
+            allowIn: true,
+            allowYield: true,
+            labelSet: {},
+            inFunctionBody: false,
+            inIteration: false,
+            inSwitch: false,
+            lastCommentStart: -1,
+            curlyStack: []
+        };
+
+        extra = {};
+
+        // Options matching.
+        options = options || {};
+
+        // Of course we collect tokens here.
+        options.tokens = true;
+        extra.tokens = [];
+        extra.tokenValues = [];
+        extra.tokenize = true;
+        extra.delegate = delegate;
+
+        // The following two fields are necessary to compute the Regex tokens.
+        extra.openParenToken = -1;
+        extra.openCurlyToken = -1;
+
+        extra.range = (typeof options.range === 'boolean') && options.range;
+        extra.loc = (typeof options.loc === 'boolean') && options.loc;
+
+        if (typeof options.comment === 'boolean' && options.comment) {
+            extra.comments = [];
+        }
+        if (typeof options.tolerant === 'boolean' && options.tolerant) {
+            extra.errors = [];
+        }
+
+        try {
+            peek();
+            if (lookahead.type === Token.EOF) {
+                return extra.tokens;
+            }
+
+            lex();
+            while (lookahead.type !== Token.EOF) {
+                try {
+                    lex();
+                } catch (lexError) {
+                    if (extra.errors) {
+                        recordError(lexError);
+                        // We have to break on the first error
+                        // to avoid infinite loops.
+                        break;
+                    } else {
+                        throw lexError;
+                    }
+                }
+            }
+
+            tokens = extra.tokens;
+            if (typeof extra.errors !== 'undefined') {
+                tokens.errors = extra.errors;
+            }
+        } catch (e) {
+            throw e;
+        } finally {
+            extra = {};
+        }
+        return tokens;
+    }
+
+    function parse(code, options) {
+        var program, toString;
+
+        toString = String;
+        if (typeof code !== 'string' && !(code instanceof String)) {
+            code = toString(code);
+        }
+
+        source = code;
+        index = 0;
+        lineNumber = (source.length > 0) ? 1 : 0;
+        lineStart = 0;
+        startIndex = index;
+        startLineNumber = lineNumber;
+        startLineStart = lineStart;
+        length = source.length;
+        lookahead = null;
+        state = {
+            allowIn: true,
+            allowYield: true,
+            labelSet: {},
+            inFunctionBody: false,
+            inIteration: false,
+            inSwitch: false,
+            lastCommentStart: -1,
+            curlyStack: [],
+            sourceType: 'script'
+        };
+        strict = false;
+
+        extra = {};
+        if (typeof options !== 'undefined') {
+            extra.range = (typeof options.range === 'boolean') && options.range;
+            extra.loc = (typeof options.loc === 'boolean') && options.loc;
+            extra.attachComment = (typeof options.attachComment === 'boolean') && options.attachComment;
+
+            if (extra.loc && options.source !== null && options.source !== undefined) {
+                extra.source = toString(options.source);
+            }
+
+            if (typeof options.tokens === 'boolean' && options.tokens) {
+                extra.tokens = [];
+            }
+            if (typeof options.comment === 'boolean' && options.comment) {
+                extra.comments = [];
+            }
+            if (typeof options.tolerant === 'boolean' && options.tolerant) {
+                extra.errors = [];
+            }
+            if (extra.attachComment) {
+                extra.range = true;
+                extra.comments = [];
+                extra.bottomRightStack = [];
+                extra.trailingComments = [];
+                extra.leadingComments = [];
+            }
+            if (options.sourceType === 'module') {
+                // very restrictive condition for now
+                state.sourceType = options.sourceType;
+                strict = true;
+            }
+        }
+
+        try {
+            program = parseProgram();
+            if (typeof extra.comments !== 'undefined') {
+                program.comments = extra.comments;
+            }
+            if (typeof extra.tokens !== 'undefined') {
+                filterTokenLocation();
+                program.tokens = extra.tokens;
+            }
+            if (typeof extra.errors !== 'undefined') {
+                program.errors = extra.errors;
+            }
+        } catch (e) {
+            throw e;
+        } finally {
+            extra = {};
+        }
+
+        return program;
+    }
+
+    // Sync with *.json manifests.
+    exports.version = '2.7.3';
+
+    exports.tokenize = tokenize;
+
+    exports.parse = parse;
+
+    // Deep copy.
+    /* istanbul ignore next */
+    exports.Syntax = (function () {
+        var name, types = {};
+
+        if (typeof Object.create === 'function') {
+            types = Object.create(null);
+        }
+
+        for (name in Syntax) {
+            if (Syntax.hasOwnProperty(name)) {
+                types[name] = Syntax[name];
+            }
+        }
+
+        if (typeof Object.freeze === 'function') {
+            Object.freeze(types);
+        }
+
+        return types;
+    }());
+
+}));
+/* vim: set sw=4 ts=4 et tw=80 : */
diff --git a/node_modules/svgo/node_modules/esprima/package.json b/node_modules/svgo/node_modules/esprima/package.json
new file mode 100644
index 00000000..f2d59120
--- /dev/null
+++ b/node_modules/svgo/node_modules/esprima/package.json
@@ -0,0 +1,99 @@
+{
+  "name": "esprima",
+  "description": "ECMAScript parsing infrastructure for multipurpose analysis",
+  "homepage": "http://esprima.org",
+  "main": "esprima.js",
+  "bin": {
+    "esparse": "./bin/esparse.js",
+    "esvalidate": "./bin/esvalidate.js"
+  },
+  "version": "2.7.3",
+  "files": [
+    "bin",
+    "unit-tests.js",
+    "esprima.js"
+  ],
+  "engines": {
+    "node": ">=0.10.0"
+  },
+  "author": {
+    "name": "Ariya Hidayat",
+    "email": "ariya.hidayat@gmail.com"
+  },
+  "maintainers": [
+    {
+      "name": "Ariya Hidayat",
+      "email": "ariya.hidayat@gmail.com",
+      "web": "http://ariya.ofilabs.com"
+    }
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/jquery/esprima.git"
+  },
+  "bugs": {
+    "url": "https://github.com/jquery/esprima/issues"
+  },
+  "license": "BSD-2-Clause",
+  "devDependencies": {
+    "codecov.io": "~0.1.6",
+    "escomplex-js": "1.2.0",
+    "eslint": "~1.7.2",
+    "everything.js": "~1.0.3",
+    "glob": "^5.0.15",
+    "istanbul": "~0.4.0",
+    "jscs": "~2.3.5",
+    "json-diff": "~0.3.1",
+    "karma": "^0.13.11",
+    "karma-chrome-launcher": "^0.2.1",
+    "karma-detect-browsers": "^2.0.2",
+    "karma-firefox-launcher": "^0.1.6",
+    "karma-ie-launcher": "^0.2.0",
+    "karma-mocha": "^0.2.0",
+    "karma-safari-launcher": "^0.1.1",
+    "karma-sauce-launcher": "^0.2.14",
+    "lodash": "^3.10.0",
+    "mocha": "^2.3.3",
+    "node-tick-processor": "~0.0.2",
+    "regenerate": "~1.2.1",
+    "temp": "~0.8.3",
+    "unicode-7.0.0": "~0.1.5"
+  },
+  "keywords": [
+    "ast",
+    "ecmascript",
+    "javascript",
+    "parser",
+    "syntax"
+  ],
+  "scripts": {
+    "check-version": "node test/check-version.js",
+    "jscs": "jscs -p crockford esprima.js && jscs -p crockford test/*.js",
+    "eslint": "node node_modules/eslint/bin/eslint.js -c .lintrc esprima.js",
+    "complexity": "node test/check-complexity.js",
+    "static-analysis": "npm run check-version && npm run jscs && npm run eslint && npm run complexity",
+    "unit-tests": "node test/unit-tests.js",
+    "grammar-tests": "node test/grammar-tests.js",
+    "regression-tests": "node test/regression-tests.js",
+    "all-tests": "npm run generate-fixtures && npm run unit-tests && npm run grammar-tests && npm run regression-tests",
+    "generate-fixtures": "node tools/generate-fixtures.js",
+    "browser-tests": "npm run generate-fixtures && cd test && karma start --single-run",
+    "saucelabs-evergreen": "cd test && karma start saucelabs-evergreen.conf.js",
+    "saucelabs-safari": "cd test && karma start saucelabs-safari.conf.js",
+    "saucelabs-ie": "cd test && karma start saucelabs-ie.conf.js",
+    "analyze-coverage": "istanbul cover test/unit-tests.js",
+    "check-coverage": "istanbul check-coverage --statement 100 --branch 100 --function 100",
+    "dynamic-analysis": "npm run analyze-coverage && npm run check-coverage",
+    "test": "npm run all-tests && npm run static-analysis && npm run dynamic-analysis",
+    "profile": "node --prof test/profile.js && mv isolate*.log v8.log && node-tick-processor",
+    "benchmark": "node test/benchmarks.js",
+    "benchmark-quick": "node test/benchmarks.js quick",
+    "codecov" : "istanbul report cobertura && codecov < ./coverage/cobertura-coverage.xml",
+    "downstream": "node test/downstream.js",
+    "travis": "npm test",
+    "circleci": "npm test && npm run codecov && npm run downstream",
+    "appveyor": "npm run all-tests && npm run browser-tests && npm run dynamic-analysis",
+    "droneio": "npm test && npm run saucelabs-evergreen && npm run saucelabs-ie && npm run saucelabs-safari",
+    "generate-regex": "node tools/generate-identifier-regex.js"
+  }
+}
diff --git a/node_modules/svgo/node_modules/js-yaml/.bin/js-yaml b/node_modules/svgo/node_modules/js-yaml/.bin/js-yaml
new file mode 120000
index 00000000..978fe612
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/.bin/js-yaml
@@ -0,0 +1 @@
+../bin/js-yaml.js
\ No newline at end of file
diff --git a/node_modules/svgo/node_modules/js-yaml/CHANGELOG.md b/node_modules/svgo/node_modules/js-yaml/CHANGELOG.md
new file mode 100644
index 00000000..103b1bbc
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/CHANGELOG.md
@@ -0,0 +1,409 @@
+3.7.0 / 2016-11-12
+------------------
+
+- Fix parsing of quotes followed by newlines (#304, thanks to @dplepage).
+- Support polymorphism for tags (#300, thanks to @monken).
+
+
+3.6.1 / 2016-05-11
+------------------
+
+- Fix output cut on a pipe, #286.
+
+
+3.6.0 / 2016-04-16
+------------------
+
+- Dumper rewrite, fix multiple bugs with trailing `\n`.
+  Big thanks to @aepsilon!
+- Loader: fix leading/trailing newlines in block scalars, @aepsilon.
+
+
+3.5.5 / 2016-03-17
+------------------
+
+- Date parse fix: don't allow dates with on digit in month and day, #268.
+
+
+3.5.4 / 2016-03-09
+------------------
+
+- `noCompatMode` for dumper, to disable quoting YAML 1.1 values.
+
+
+3.5.3 / 2016-02-11
+------------------
+
+- Maintenance release.
+
+
+3.5.2 / 2016-01-11
+------------------
+
+- Maintenance: missed comma in bower config.
+
+
+3.5.1 / 2016-01-11
+------------------
+
+- Removed `inherit` dependency, #239.
+- Better browserify workaround for esprima load.
+- Demo rewrite.
+
+
+3.5.0 / 2016-01-10
+------------------
+
+- Dumper. Fold strings only, #217.
+- Dumper. `norefs` option, to clone linked objects, #229.
+- Loader. Throw a warning for duplicate keys, #166.
+- Improved browserify support (mark `esprima` & `Buffer` excluded).
+
+
+3.4.6 / 2015-11-26
+------------------
+
+- Use standalone `inherit` to keep browserified files clear.
+
+
+3.4.5 / 2015-11-23
+------------------
+
+- Added `lineWidth` option to dumper.
+
+
+3.4.4 / 2015-11-21
+------------------
+
+- Fixed floats dump (missed dot for scientific format), #220.
+- Allow non-printable characters inside quoted scalars, #192.
+
+
+3.4.3 / 2015-10-10
+------------------
+
+- Maintenance release - deps bump (esprima, argparse).
+
+
+3.4.2 / 2015-09-09
+------------------
+
+- Fixed serialization of duplicated entries in sequences, #205.
+  Thanks to @vogelsgesang.
+
+
+3.4.1 / 2015-09-05
+------------------
+
+- Fixed stacktrace handling in generated errors, for browsers (FF/IE).
+
+
+3.4.0 / 2015-08-23
+------------------
+
+- Fixed multiline keys dump, #197. Thanks to @tcr.
+- Don't throw on warnongs anymore. Use `onWarning` option to catch.
+- Throw error on unknown tags (was warning before).
+- Fixed heading line breaks in some scalars (regression).
+- Reworked internals of error class.
+
+
+3.3.1 / 2015-05-13
+------------------
+
+- Added `.sortKeys` dumper option, thanks to @rjmunro.
+- Fixed astral characters support, #191.
+
+
+3.3.0 / 2015-04-26
+------------------
+
+- Significantly improved long strings formatting in dumper, thanks to @isaacs.
+- Strip BOM if exists.
+
+
+3.2.7 / 2015-02-19
+------------------
+
+- Maintenance release.
+- Updated dependencies.
+- HISTORY.md -> CHANGELOG.md
+
+
+3.2.6 / 2015-02-07
+------------------
+
+- Fixed encoding of UTF-16 surrogate pairs. (e.g. "\U0001F431" CAT FACE).
+- Fixed demo dates dump (#113, thanks to @Hypercubed).
+
+
+3.2.5 / 2014-12-28
+------------------
+
+- Fixed resolving of all built-in types on empty nodes.
+- Fixed invalid warning on empty lines within quoted scalars and flow collections.
+- Fixed bug: Tag on an empty node didn't resolve in some cases.
+
+
+3.2.4 / 2014-12-19
+------------------
+
+- Fixed resolving of !!null tag on an empty node.
+
+
+3.2.3 / 2014-11-08
+------------------
+
+- Implemented dumping of objects with circular and cross references.
+- Partially fixed aliasing of constructed objects. (see issue #141 for details)
+
+
+3.2.2 / 2014-09-07
+------------------
+
+- Fixed infinite loop on unindented block scalars.
+- Rewritten base64 encode/decode in binary type, to keep code licence clear.
+
+
+3.2.1 / 2014-08-24
+------------------
+
+- Nothig new. Just fix npm publish error.
+
+
+3.2.0 / 2014-08-24
+------------------
+
+- Added input piping support to CLI.
+- Fixed typo, that could cause hand on initial indent (#139).
+
+
+3.1.0 / 2014-07-07
+------------------
+
+- 1.5x-2x speed boost.
+- Removed deprecated `require('xxx.yml')` support.
+- Significant code cleanup and refactoring.
+- Internal API changed. If you used custom types - see updated examples.
+  Others are not affected.
+- Even if the input string has no trailing line break character,
+  it will be parsed as if it has one.
+- Added benchmark scripts.
+- Moved bower files to /dist folder
+- Bugfixes.
+
+
+3.0.2 / 2014-02-27
+------------------
+
+- Fixed bug: "constructor" string parsed as `null`.
+
+
+3.0.1 / 2013-12-22
+------------------
+
+- Fixed parsing of literal scalars. (issue #108)
+- Prevented adding unnecessary spaces in object dumps. (issue #68)
+- Fixed dumping of objects with very long (> 1024 in length) keys.
+
+
+3.0.0 / 2013-12-16
+------------------
+
+- Refactored code. Changed API for custom types.
+- Removed output colors in CLI, dump json by default.
+- Removed big dependencies from browser version (esprima, buffer)
+  - load `esprima` manually, if !!js/function needed
+  - !!bin now returns Array in browser
+- AMD support.
+- Don't quote dumped strings because of `-` & `?` (if not first char).
+- __Deprecated__ loading yaml files via `require()`, as not recommended
+  behaviour for node.
+
+
+2.1.3 / 2013-10-16
+------------------
+
+- Fix wrong loading of empty block scalars.
+
+
+2.1.2 / 2013-10-07
+------------------
+
+- Fix unwanted line breaks in folded scalars.
+
+
+2.1.1 / 2013-10-02
+------------------
+
+- Dumper now respects deprecated booleans syntax from YAML 1.0/1.1
+- Fixed reader bug in JSON-like sequences/mappings.
+
+
+2.1.0 / 2013-06-05
+------------------
+
+- Add standard YAML schemas: Failsafe (`FAILSAFE_SCHEMA`),
+  JSON (`JSON_SCHEMA`) and Core (`CORE_SCHEMA`).
+- Rename `DEFAULT_SCHEMA` to `DEFAULT_FULL_SCHEMA`
+  and `SAFE_SCHEMA` to `DEFAULT_SAFE_SCHEMA`.
+- Bug fix: export `NIL` constant from the public interface.
+- Add `skipInvalid` dumper option.
+- Use `safeLoad` for `require` extension.
+
+
+2.0.5 / 2013-04-26
+------------------
+
+- Close security issue in !!js/function constructor.
+  Big thanks to @nealpoole for security audit.
+
+
+2.0.4 / 2013-04-08
+------------------
+
+- Updated .npmignore to reduce package size
+
+
+2.0.3 / 2013-02-26
+------------------
+
+- Fixed dumping of empty arrays ans objects. ([] and {} instead of null)
+
+
+2.0.2 / 2013-02-15
+------------------
+
+- Fixed input validation: tabs are printable characters.
+
+
+2.0.1 / 2013-02-09
+------------------
+
+- Fixed error, when options not passed to function cass
+
+
+2.0.0 / 2013-02-09
+------------------
+
+- Full rewrite. New architecture. Fast one-stage parsing.
+- Changed custom types API.
+- Added YAML dumper.
+
+
+1.0.3 / 2012-11-05
+------------------
+
+- Fixed utf-8 files loading.
+
+
+1.0.2 / 2012-08-02
+------------------
+
+- Pull out hand-written shims. Use ES5-Shims for old browsers support. See #44.
+- Fix timstamps incorectly parsed in local time when no time part specified.
+
+
+1.0.1 / 2012-07-07
+------------------
+
+- Fixes `TypeError: 'undefined' is not an object` under Safari. Thanks Phuong.
+- Fix timestamps incorrectly parsed in local time. Thanks @caolan. Closes #46.
+
+
+1.0.0 / 2012-07-01
+------------------
+
+- `y`, `yes`, `n`, `no`, `on`, `off` are not converted to Booleans anymore.
+  Fixes #42.
+- `require(filename)` now returns a single document and throws an Error if
+  file contains more than one document.
+- CLI was merged back from js-yaml.bin
+
+
+0.3.7 / 2012-02-28
+------------------
+
+- Fix export of `addConstructor()`. Closes #39.
+
+
+0.3.6 / 2012-02-22
+------------------
+
+- Removed AMD parts - too buggy to use. Need help to rewrite from scratch
+- Removed YUI compressor warning (renamed `double` variable). Closes #40.
+
+
+0.3.5 / 2012-01-10
+------------------
+
+- Workagound for .npmignore fuckup under windows. Thanks to airportyh.
+
+
+0.3.4 / 2011-12-24
+------------------
+
+- Fixes str[] for oldIEs support.
+- Adds better has change support for browserified demo.
+- improves compact output of Error. Closes #33.
+
+
+0.3.3 / 2011-12-20
+------------------
+
+- jsyaml executable moved to separate module.
+- adds `compact` stringification of Errors.
+
+
+0.3.2 / 2011-12-16
+------------------
+
+- Fixes ug with block style scalars. Closes #26.
+- All sources are passing JSLint now.
+- Fixes bug in Safari. Closes #28.
+- Fixes bug in Opers. Closes #29.
+- Improves browser support. Closes #20.
+- Added jsyaml executable.
+- Added !!js/function support. Closes #12.
+
+
+0.3.1 / 2011-11-18
+------------------
+
+- Added AMD support for browserified version.
+- Wrapped browserified js-yaml into closure.
+- Fixed the resolvement of non-specific tags. Closes #17.
+- Added permalinks for online demo YAML snippets. Now we have YPaste service, lol.
+- Added !!js/regexp and !!js/undefined types. Partially solves #12.
+- Fixed !!set mapping.
+- Fixed month parse in dates. Closes #19.
+
+
+0.3.0 / 2011-11-09
+------------------
+
+- Removed JS.Class dependency. Closes #3.
+- Added browserified version. Closes #13.
+- Added live demo of browserified version.
+- Ported some of the PyYAML tests. See #14.
+- Fixed timestamp bug when fraction was given.
+
+
+0.2.2 / 2011-11-06
+------------------
+
+- Fixed crash on docs without ---. Closes #8.
+- Fixed miltiline string parse
+- Fixed tests/comments for using array as key
+
+
+0.2.1 / 2011-11-02
+------------------
+
+- Fixed short file read (<4k). Closes #9.
+
+
+0.2.0 / 2011-11-02
+------------------
+
+- First public release
diff --git a/node_modules/svgo/node_modules/js-yaml/LICENSE b/node_modules/svgo/node_modules/js-yaml/LICENSE
new file mode 100644
index 00000000..09d3a29e
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/LICENSE
@@ -0,0 +1,21 @@
+(The MIT License)
+
+Copyright (C) 2011-2015 by Vitaly Puzrin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/node_modules/svgo/node_modules/js-yaml/README.md b/node_modules/svgo/node_modules/js-yaml/README.md
new file mode 100644
index 00000000..45c35020
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/README.md
@@ -0,0 +1,295 @@
+JS-YAML - YAML 1.2 parser / writer for JavaScript
+=================================================
+
+[![Build Status](https://travis-ci.org/nodeca/js-yaml.svg?branch=master)](https://travis-ci.org/nodeca/js-yaml)
+[![NPM version](https://img.shields.io/npm/v/js-yaml.svg)](https://www.npmjs.org/package/js-yaml)
+
+__[Online Demo](http://nodeca.github.com/js-yaml/)__
+
+
+This is an implementation of [YAML](http://yaml.org/), a human friendly data
+serialization language. Started as [PyYAML](http://pyyaml.org/) port, it was
+completely rewritten from scratch. Now it's very fast, and supports 1.2 spec.
+
+
+Installation
+------------
+
+### YAML module for node.js
+
+```
+npm install js-yaml
+```
+
+
+### CLI executable
+
+If you want to inspect your YAML files from CLI, install js-yaml globally:
+
+```
+npm install -g js-yaml
+```
+
+#### Usage
+
+```
+usage: js-yaml [-h] [-v] [-c] [-t] file
+
+Positional arguments:
+  file           File with YAML document(s)
+
+Optional arguments:
+  -h, --help     Show this help message and exit.
+  -v, --version  Show program's version number and exit.
+  -c, --compact  Display errors in compact mode
+  -t, --trace    Show stack trace on error
+```
+
+
+### Bundled YAML library for browsers
+
+``` html
+<!-- esprima required only for !!js/function -->
+<script src="esprima.js"></script>
+<script src="js-yaml.min.js"></script>
+<script type="text/javascript">
+var doc = jsyaml.load('greeting: hello\nname: world');
+</script>
+```
+
+Browser support was done mostly for online demo. If you find any errors - feel
+free to send pull requests with fixes. Also note, that IE and other old browsers
+needs [es5-shims](https://github.com/kriskowal/es5-shim) to operate.
+
+Notes:
+
+1. We have no resources to support browserified version. Don't expect it to be
+   well tested. Don't expect fast fixes if something goes wrong there.
+2. `!!js/function` in browser bundle will not work by default. If you really need
+   it - load `esprima` parser first (via amd or directly).
+3. `!!bin` in browser will return `Array`, because browsers do not support
+   node.js `Buffer` and adding Buffer shims is completely useless on practice.
+
+
+API
+---
+
+Here we cover the most 'useful' methods. If you need advanced details (creating
+your own tags), see [wiki](https://github.com/nodeca/js-yaml/wiki) and
+[examples](https://github.com/nodeca/js-yaml/tree/master/examples) for more
+info.
+
+``` javascript
+yaml = require('js-yaml');
+fs   = require('fs');
+
+// Get document, or throw exception on error
+try {
+  var doc = yaml.safeLoad(fs.readFileSync('/home/ixti/example.yml', 'utf8'));
+  console.log(doc);
+} catch (e) {
+  console.log(e);
+}
+```
+
+
+### safeLoad (string [ , options ])
+
+**Recommended loading way.** Parses `string` as single YAML document. Returns a JavaScript
+object or throws `YAMLException` on error. By default, does not support regexps,
+functions and undefined. This method is safe for untrusted data.
+
+options:
+
+- `filename` _(default: null)_ - string to be used as a file path in
+  error/warning messages.
+- `onWarning` _(default: null)_ - function to call on warning messages.
+  Loader will throw on warnings if this function is not provided.
+- `schema` _(default: `DEFAULT_SAFE_SCHEMA`)_ - specifies a schema to use.
+  - `FAILSAFE_SCHEMA` - only strings, arrays and plain objects:
+    http://www.yaml.org/spec/1.2/spec.html#id2802346
+  - `JSON_SCHEMA` - all JSON-supported types:
+    http://www.yaml.org/spec/1.2/spec.html#id2803231
+  - `CORE_SCHEMA` - same as `JSON_SCHEMA`:
+    http://www.yaml.org/spec/1.2/spec.html#id2804923
+  - `DEFAULT_SAFE_SCHEMA` - all supported YAML types, without unsafe ones
+    (`!!js/undefined`, `!!js/regexp` and `!!js/function`):
+    http://yaml.org/type/
+  - `DEFAULT_FULL_SCHEMA` - all supported YAML types.
+- `json` _(default: false)_ - compatibility with JSON.parse behaviour. If true, then duplicate keys in a mapping will override values rather than throwing an error.
+
+NOTE: This function **does not** understand multi-document sources, it throws
+exception on those.
+
+NOTE: JS-YAML **does not** support schema-specific tag resolution restrictions.
+So, JSON schema is not as strict as defined in the YAML specification.
+It allows numbers in any notation, use `Null` and `NULL` as `null`, etc.
+Core schema also has no such restrictions. It allows binary notation for integers.
+
+
+### load (string [ , options ])
+
+**Use with care with untrusted sources**. The same as `safeLoad()` but uses
+`DEFAULT_FULL_SCHEMA` by default - adds some JavaScript-specific types:
+`!!js/function`, `!!js/regexp` and `!!js/undefined`. For untrusted sources you
+must additionally validate object structure, to avoid injections:
+
+``` javascript
+var untrusted_code = '"toString": !<tag:yaml.org,2002:js/function> "function (){very_evil_thing();}"';
+
+// I'm just converting that string, what could possibly go wrong?
+require('js-yaml').load(untrusted_code) + ''
+```
+
+
+### safeLoadAll (string, iterator [ , options ])
+
+Same as `safeLoad()`, but understands multi-document sources and apply
+`iterator` to each document.
+
+``` javascript
+var yaml = require('js-yaml');
+
+yaml.safeLoadAll(data, function (doc) {
+  console.log(doc);
+});
+```
+
+
+### loadAll (string, iterator [ , options ])
+
+Same as `safeLoadAll()` but uses `DEFAULT_FULL_SCHEMA` by default.
+
+
+### safeDump (object [ , options ])
+
+Serializes `object` as YAML document. Uses `DEFAULT_SAFE_SCHEMA`, so it will
+throw exception if you try to dump regexps or functions. However, you can
+disable exceptions by `skipInvalid` option.
+
+options:
+
+- `indent` _(default: 2)_ - indentation width to use (in spaces).
+- `skipInvalid` _(default: false)_ - do not throw on invalid types (like function
+  in the safe schema) and skip pairs and single values with such types.
+- `flowLevel` (default: -1) - specifies level of nesting, when to switch from
+  block to flow style for collections. -1 means block style everwhere
+- `styles` - "tag" => "style" map. Each tag may have own set of styles.
+- `schema` _(default: `DEFAULT_SAFE_SCHEMA`)_ specifies a schema to use.
+- `sortKeys` _(default: `false`)_ - if `true`, sort keys when dumping YAML. If a
+  function, use the function to sort the keys.
+- `lineWidth` _(default: `80`)_ - set max line width.
+- `noRefs` _(default: `false`)_ - if `true`, don't convert duplicate objects into references
+- `noCompatMode` _(default: `false`)_ - if `true` don't try to be compatible with older
+  yaml versions. Currently: don't quote "yes", "no" and so on, as required for YAML 1.1
+
+styles:
+
+``` none
+!!null
+  "canonical"   => "~"
+
+!!int
+  "binary"      => "0b1", "0b101010", "0b1110001111010"
+  "octal"       => "01", "052", "016172"
+  "decimal"     => "1", "42", "7290"
+  "hexadecimal" => "0x1", "0x2A", "0x1C7A"
+
+!!null, !!bool, !!float
+  "lowercase"   => "null", "true", "false", ".nan", '.inf'
+  "uppercase"   => "NULL", "TRUE", "FALSE", ".NAN", '.INF'
+  "camelcase"   => "Null", "True", "False", ".NaN", '.Inf'
+```
+
+By default, !!int uses `decimal`, and !!null, !!bool, !!float use `lowercase`.
+
+
+
+### dump (object [ , options ])
+
+Same as `safeDump()` but without limits (uses `DEFAULT_FULL_SCHEMA` by default).
+
+
+Supported YAML types
+--------------------
+
+The list of standard YAML tags and corresponding JavaScipt types. See also
+[YAML tag discussion](http://pyyaml.org/wiki/YAMLTagDiscussion) and
+[YAML types repository](http://yaml.org/type/).
+
+```
+!!null ''                   # null
+!!bool 'yes'                # bool
+!!int '3...'                # number
+!!float '3.14...'           # number
+!!binary '...base64...'     # buffer
+!!timestamp 'YYYY-...'      # date
+!!omap [ ... ]              # array of key-value pairs
+!!pairs [ ... ]             # array or array pairs
+!!set { ... }               # array of objects with given keys and null values
+!!str '...'                 # string
+!!seq [ ... ]               # array
+!!map { ... }               # object
+```
+
+**JavaScript-specific tags**
+
+```
+!!js/regexp /pattern/gim            # RegExp
+!!js/undefined ''                   # Undefined
+!!js/function 'function () {...}'   # Function
+```
+
+Caveats
+-------
+
+Note, that you use arrays or objects as key in JS-YAML. JS does not allow objects
+or array as keys, and stringifies (by calling .toString method) them at the
+moment of adding them.
+
+``` yaml
+---
+? [ foo, bar ]
+: - baz
+? { foo: bar }
+: - baz
+  - baz
+```
+
+``` javascript
+{ "foo,bar": ["baz"], "[object Object]": ["baz", "baz"] }
+```
+
+Also, reading of properties on implicit block mapping keys is not supported yet.
+So, the following YAML document cannot be loaded.
+
+``` yaml
+&anchor foo:
+  foo: bar
+  *anchor: duplicate key
+  baz: bat
+  *anchor: duplicate key
+```
+
+
+Breaking changes in 2.x.x -> 3.x.x
+----------------------------------
+
+If you have not used __custom__ tags or loader classes and not loaded yaml
+files via `require()` - no changes needed. Just upgrade library.
+
+Otherwise, you should:
+
+1. Replace all occurences of `require('xxxx.yml')` by `fs.readFileSync()` +
+  `yaml.safeLoad()`.
+2. rewrite your custom tags constructors and custom loader
+  classes, to conform new API. See
+  [examples](https://github.com/nodeca/js-yaml/tree/master/examples) and
+  [wiki](https://github.com/nodeca/js-yaml/wiki) for details.
+
+
+License
+-------
+
+View the [LICENSE](https://github.com/nodeca/js-yaml/blob/master/LICENSE) file
+(MIT).
diff --git a/node_modules/svgo/node_modules/js-yaml/bin/js-yaml.js b/node_modules/svgo/node_modules/js-yaml/bin/js-yaml.js
new file mode 100755
index 00000000..e79186be
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/bin/js-yaml.js
@@ -0,0 +1,132 @@
+#!/usr/bin/env node
+
+
+'use strict';
+
+/*eslint-disable no-console*/
+
+
+// stdlib
+var fs    = require('fs');
+
+
+// 3rd-party
+var argparse = require('argparse');
+
+
+// internal
+var yaml = require('..');
+
+
+////////////////////////////////////////////////////////////////////////////////
+
+
+var cli = new argparse.ArgumentParser({
+  prog:     'js-yaml',
+  version:  require('../package.json').version,
+  addHelp:  true
+});
+
+
+cli.addArgument([ '-c', '--compact' ], {
+  help:   'Display errors in compact mode',
+  action: 'storeTrue'
+});
+
+
+// deprecated (not needed after we removed output colors)
+// option suppressed, but not completely removed for compatibility
+cli.addArgument([ '-j', '--to-json' ], {
+  help:   argparse.Const.SUPPRESS,
+  dest:   'json',
+  action: 'storeTrue'
+});
+
+
+cli.addArgument([ '-t', '--trace' ], {
+  help:   'Show stack trace on error',
+  action: 'storeTrue'
+});
+
+cli.addArgument([ 'file' ], {
+  help:   'File to read, utf-8 encoded without BOM',
+  nargs:  '?',
+  defaultValue: '-'
+});
+
+
+////////////////////////////////////////////////////////////////////////////////
+
+
+var options = cli.parseArgs();
+
+
+////////////////////////////////////////////////////////////////////////////////
+
+function readFile(filename, encoding, callback) {
+  if (options.file === '-') {
+    // read from stdin
+
+    var chunks = [];
+
+    process.stdin.on('data', function (chunk) {
+      chunks.push(chunk);
+    });
+
+    process.stdin.on('end', function () {
+      return callback(null, Buffer.concat(chunks).toString(encoding));
+    });
+  } else {
+    fs.readFile(filename, encoding, callback);
+  }
+}
+
+readFile(options.file, 'utf8', function (error, input) {
+  var output, isYaml;
+
+  if (error) {
+    if (error.code === 'ENOENT') {
+      console.error('File not found: ' + options.file);
+      process.exit(2);
+    }
+
+    console.error(
+      options.trace && error.stack ||
+      error.message ||
+      String(error));
+
+    process.exit(1);
+  }
+
+  try {
+    output = JSON.parse(input);
+    isYaml = false;
+  } catch (err) {
+    if (err instanceof SyntaxError) {
+      try {
+        output = [];
+        yaml.loadAll(input, function (doc) { output.push(doc); }, {});
+        isYaml = true;
+
+        if (output.length === 0) output = null;
+        else if (output.length === 1) output = output[0];
+
+      } catch (e) {
+        if (options.trace && err.stack) console.error(e.stack);
+        else console.error(e.toString(options.compact));
+
+        process.exit(1);
+      }
+    } else {
+      console.error(
+        options.trace && err.stack ||
+        err.message ||
+        String(err));
+
+      process.exit(1);
+    }
+  }
+
+  if (isYaml) console.log(JSON.stringify(output, null, '  '));
+  else console.log(yaml.dump(output));
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/dist/js-yaml.js b/node_modules/svgo/node_modules/js-yaml/dist/js-yaml.js
new file mode 100644
index 00000000..49cb23c9
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/dist/js-yaml.js
@@ -0,0 +1,3855 @@
+/* js-yaml 3.7.0 https://github.com/nodeca/js-yaml */(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.jsyaml = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
+'use strict';
+
+
+var loader = require('./js-yaml/loader');
+var dumper = require('./js-yaml/dumper');
+
+
+function deprecated(name) {
+  return function () {
+    throw new Error('Function ' + name + ' is deprecated and cannot be used.');
+  };
+}
+
+
+module.exports.Type                = require('./js-yaml/type');
+module.exports.Schema              = require('./js-yaml/schema');
+module.exports.FAILSAFE_SCHEMA     = require('./js-yaml/schema/failsafe');
+module.exports.JSON_SCHEMA         = require('./js-yaml/schema/json');
+module.exports.CORE_SCHEMA         = require('./js-yaml/schema/core');
+module.exports.DEFAULT_SAFE_SCHEMA = require('./js-yaml/schema/default_safe');
+module.exports.DEFAULT_FULL_SCHEMA = require('./js-yaml/schema/default_full');
+module.exports.load                = loader.load;
+module.exports.loadAll             = loader.loadAll;
+module.exports.safeLoad            = loader.safeLoad;
+module.exports.safeLoadAll         = loader.safeLoadAll;
+module.exports.dump                = dumper.dump;
+module.exports.safeDump            = dumper.safeDump;
+module.exports.YAMLException       = require('./js-yaml/exception');
+
+// Deprecated schema names from JS-YAML 2.0.x
+module.exports.MINIMAL_SCHEMA = require('./js-yaml/schema/failsafe');
+module.exports.SAFE_SCHEMA    = require('./js-yaml/schema/default_safe');
+module.exports.DEFAULT_SCHEMA = require('./js-yaml/schema/default_full');
+
+// Deprecated functions from JS-YAML 1.x.x
+module.exports.scan           = deprecated('scan');
+module.exports.parse          = deprecated('parse');
+module.exports.compose        = deprecated('compose');
+module.exports.addConstructor = deprecated('addConstructor');
+
+},{"./js-yaml/dumper":3,"./js-yaml/exception":4,"./js-yaml/loader":5,"./js-yaml/schema":7,"./js-yaml/schema/core":8,"./js-yaml/schema/default_full":9,"./js-yaml/schema/default_safe":10,"./js-yaml/schema/failsafe":11,"./js-yaml/schema/json":12,"./js-yaml/type":13}],2:[function(require,module,exports){
+'use strict';
+
+
+function isNothing(subject) {
+  return (typeof subject === 'undefined') || (subject === null);
+}
+
+
+function isObject(subject) {
+  return (typeof subject === 'object') && (subject !== null);
+}
+
+
+function toArray(sequence) {
+  if (Array.isArray(sequence)) return sequence;
+  else if (isNothing(sequence)) return [];
+
+  return [ sequence ];
+}
+
+
+function extend(target, source) {
+  var index, length, key, sourceKeys;
+
+  if (source) {
+    sourceKeys = Object.keys(source);
+
+    for (index = 0, length = sourceKeys.length; index < length; index += 1) {
+      key = sourceKeys[index];
+      target[key] = source[key];
+    }
+  }
+
+  return target;
+}
+
+
+function repeat(string, count) {
+  var result = '', cycle;
+
+  for (cycle = 0; cycle < count; cycle += 1) {
+    result += string;
+  }
+
+  return result;
+}
+
+
+function isNegativeZero(number) {
+  return (number === 0) && (Number.NEGATIVE_INFINITY === 1 / number);
+}
+
+
+module.exports.isNothing      = isNothing;
+module.exports.isObject       = isObject;
+module.exports.toArray        = toArray;
+module.exports.repeat         = repeat;
+module.exports.isNegativeZero = isNegativeZero;
+module.exports.extend         = extend;
+
+},{}],3:[function(require,module,exports){
+'use strict';
+
+/*eslint-disable no-use-before-define*/
+
+var common              = require('./common');
+var YAMLException       = require('./exception');
+var DEFAULT_FULL_SCHEMA = require('./schema/default_full');
+var DEFAULT_SAFE_SCHEMA = require('./schema/default_safe');
+
+var _toString       = Object.prototype.toString;
+var _hasOwnProperty = Object.prototype.hasOwnProperty;
+
+var CHAR_TAB                  = 0x09; /* Tab */
+var CHAR_LINE_FEED            = 0x0A; /* LF */
+var CHAR_SPACE                = 0x20; /* Space */
+var CHAR_EXCLAMATION          = 0x21; /* ! */
+var CHAR_DOUBLE_QUOTE         = 0x22; /* " */
+var CHAR_SHARP                = 0x23; /* # */
+var CHAR_PERCENT              = 0x25; /* % */
+var CHAR_AMPERSAND            = 0x26; /* & */
+var CHAR_SINGLE_QUOTE         = 0x27; /* ' */
+var CHAR_ASTERISK             = 0x2A; /* * */
+var CHAR_COMMA                = 0x2C; /* , */
+var CHAR_MINUS                = 0x2D; /* - */
+var CHAR_COLON                = 0x3A; /* : */
+var CHAR_GREATER_THAN         = 0x3E; /* > */
+var CHAR_QUESTION             = 0x3F; /* ? */
+var CHAR_COMMERCIAL_AT        = 0x40; /* @ */
+var CHAR_LEFT_SQUARE_BRACKET  = 0x5B; /* [ */
+var CHAR_RIGHT_SQUARE_BRACKET = 0x5D; /* ] */
+var CHAR_GRAVE_ACCENT         = 0x60; /* ` */
+var CHAR_LEFT_CURLY_BRACKET   = 0x7B; /* { */
+var CHAR_VERTICAL_LINE        = 0x7C; /* | */
+var CHAR_RIGHT_CURLY_BRACKET  = 0x7D; /* } */
+
+var ESCAPE_SEQUENCES = {};
+
+ESCAPE_SEQUENCES[0x00]   = '\\0';
+ESCAPE_SEQUENCES[0x07]   = '\\a';
+ESCAPE_SEQUENCES[0x08]   = '\\b';
+ESCAPE_SEQUENCES[0x09]   = '\\t';
+ESCAPE_SEQUENCES[0x0A]   = '\\n';
+ESCAPE_SEQUENCES[0x0B]   = '\\v';
+ESCAPE_SEQUENCES[0x0C]   = '\\f';
+ESCAPE_SEQUENCES[0x0D]   = '\\r';
+ESCAPE_SEQUENCES[0x1B]   = '\\e';
+ESCAPE_SEQUENCES[0x22]   = '\\"';
+ESCAPE_SEQUENCES[0x5C]   = '\\\\';
+ESCAPE_SEQUENCES[0x85]   = '\\N';
+ESCAPE_SEQUENCES[0xA0]   = '\\_';
+ESCAPE_SEQUENCES[0x2028] = '\\L';
+ESCAPE_SEQUENCES[0x2029] = '\\P';
+
+var DEPRECATED_BOOLEANS_SYNTAX = [
+  'y', 'Y', 'yes', 'Yes', 'YES', 'on', 'On', 'ON',
+  'n', 'N', 'no', 'No', 'NO', 'off', 'Off', 'OFF'
+];
+
+function compileStyleMap(schema, map) {
+  var result, keys, index, length, tag, style, type;
+
+  if (map === null) return {};
+
+  result = {};
+  keys = Object.keys(map);
+
+  for (index = 0, length = keys.length; index < length; index += 1) {
+    tag = keys[index];
+    style = String(map[tag]);
+
+    if (tag.slice(0, 2) === '!!') {
+      tag = 'tag:yaml.org,2002:' + tag.slice(2);
+    }
+    type = schema.compiledTypeMap['fallback'][tag];
+
+    if (type && _hasOwnProperty.call(type.styleAliases, style)) {
+      style = type.styleAliases[style];
+    }
+
+    result[tag] = style;
+  }
+
+  return result;
+}
+
+function encodeHex(character) {
+  var string, handle, length;
+
+  string = character.toString(16).toUpperCase();
+
+  if (character <= 0xFF) {
+    handle = 'x';
+    length = 2;
+  } else if (character <= 0xFFFF) {
+    handle = 'u';
+    length = 4;
+  } else if (character <= 0xFFFFFFFF) {
+    handle = 'U';
+    length = 8;
+  } else {
+    throw new YAMLException('code point within a string may not be greater than 0xFFFFFFFF');
+  }
+
+  return '\\' + handle + common.repeat('0', length - string.length) + string;
+}
+
+function State(options) {
+  this.schema       = options['schema'] || DEFAULT_FULL_SCHEMA;
+  this.indent       = Math.max(1, (options['indent'] || 2));
+  this.skipInvalid  = options['skipInvalid'] || false;
+  this.flowLevel    = (common.isNothing(options['flowLevel']) ? -1 : options['flowLevel']);
+  this.styleMap     = compileStyleMap(this.schema, options['styles'] || null);
+  this.sortKeys     = options['sortKeys'] || false;
+  this.lineWidth    = options['lineWidth'] || 80;
+  this.noRefs       = options['noRefs'] || false;
+  this.noCompatMode = options['noCompatMode'] || false;
+
+  this.implicitTypes = this.schema.compiledImplicit;
+  this.explicitTypes = this.schema.compiledExplicit;
+
+  this.tag = null;
+  this.result = '';
+
+  this.duplicates = [];
+  this.usedDuplicates = null;
+}
+
+// Indents every line in a string. Empty lines (\n only) are not indented.
+function indentString(string, spaces) {
+  var ind = common.repeat(' ', spaces),
+      position = 0,
+      next = -1,
+      result = '',
+      line,
+      length = string.length;
+
+  while (position < length) {
+    next = string.indexOf('\n', position);
+    if (next === -1) {
+      line = string.slice(position);
+      position = length;
+    } else {
+      line = string.slice(position, next + 1);
+      position = next + 1;
+    }
+
+    if (line.length && line !== '\n') result += ind;
+
+    result += line;
+  }
+
+  return result;
+}
+
+function generateNextLine(state, level) {
+  return '\n' + common.repeat(' ', state.indent * level);
+}
+
+function testImplicitResolving(state, str) {
+  var index, length, type;
+
+  for (index = 0, length = state.implicitTypes.length; index < length; index += 1) {
+    type = state.implicitTypes[index];
+
+    if (type.resolve(str)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+// [33] s-white ::= s-space | s-tab
+function isWhitespace(c) {
+  return c === CHAR_SPACE || c === CHAR_TAB;
+}
+
+// Returns true if the character can be printed without escaping.
+// From YAML 1.2: "any allowed characters known to be non-printable
+// should also be escaped. [However,] This isn’t mandatory"
+// Derived from nb-char - \t - #x85 - #xA0 - #x2028 - #x2029.
+function isPrintable(c) {
+  return  (0x00020 <= c && c <= 0x00007E)
+      || ((0x000A1 <= c && c <= 0x00D7FF) && c !== 0x2028 && c !== 0x2029)
+      || ((0x0E000 <= c && c <= 0x00FFFD) && c !== 0xFEFF /* BOM */)
+      ||  (0x10000 <= c && c <= 0x10FFFF);
+}
+
+// Simplified test for values allowed after the first character in plain style.
+function isPlainSafe(c) {
+  // Uses a subset of nb-char - c-flow-indicator - ":" - "#"
+  // where nb-char ::= c-printable - b-char - c-byte-order-mark.
+  return isPrintable(c) && c !== 0xFEFF
+    // - c-flow-indicator
+    && c !== CHAR_COMMA
+    && c !== CHAR_LEFT_SQUARE_BRACKET
+    && c !== CHAR_RIGHT_SQUARE_BRACKET
+    && c !== CHAR_LEFT_CURLY_BRACKET
+    && c !== CHAR_RIGHT_CURLY_BRACKET
+    // - ":" - "#"
+    && c !== CHAR_COLON
+    && c !== CHAR_SHARP;
+}
+
+// Simplified test for values allowed as the first character in plain style.
+function isPlainSafeFirst(c) {
+  // Uses a subset of ns-char - c-indicator
+  // where ns-char = nb-char - s-white.
+  return isPrintable(c) && c !== 0xFEFF
+    && !isWhitespace(c) // - s-white
+    // - (c-indicator ::=
+    // “-” | “?” | “:” | “,” | “[” | “]” | “{” | “}”
+    && c !== CHAR_MINUS
+    && c !== CHAR_QUESTION
+    && c !== CHAR_COLON
+    && c !== CHAR_COMMA
+    && c !== CHAR_LEFT_SQUARE_BRACKET
+    && c !== CHAR_RIGHT_SQUARE_BRACKET
+    && c !== CHAR_LEFT_CURLY_BRACKET
+    && c !== CHAR_RIGHT_CURLY_BRACKET
+    // | “#” | “&” | “*” | “!” | “|” | “>” | “'” | “"”
+    && c !== CHAR_SHARP
+    && c !== CHAR_AMPERSAND
+    && c !== CHAR_ASTERISK
+    && c !== CHAR_EXCLAMATION
+    && c !== CHAR_VERTICAL_LINE
+    && c !== CHAR_GREATER_THAN
+    && c !== CHAR_SINGLE_QUOTE
+    && c !== CHAR_DOUBLE_QUOTE
+    // | “%” | “@” | “`”)
+    && c !== CHAR_PERCENT
+    && c !== CHAR_COMMERCIAL_AT
+    && c !== CHAR_GRAVE_ACCENT;
+}
+
+var STYLE_PLAIN   = 1,
+    STYLE_SINGLE  = 2,
+    STYLE_LITERAL = 3,
+    STYLE_FOLDED  = 4,
+    STYLE_DOUBLE  = 5;
+
+// Determines which scalar styles are possible and returns the preferred style.
+// lineWidth = -1 => no limit.
+// Pre-conditions: str.length > 0.
+// Post-conditions:
+//    STYLE_PLAIN or STYLE_SINGLE => no \n are in the string.
+//    STYLE_LITERAL => no lines are suitable for folding (or lineWidth is -1).
+//    STYLE_FOLDED => a line > lineWidth and can be folded (and lineWidth != -1).
+function chooseScalarStyle(string, singleLineOnly, indentPerLevel, lineWidth, testAmbiguousType) {
+  var i;
+  var char;
+  var hasLineBreak = false;
+  var hasFoldableLine = false; // only checked if shouldTrackWidth
+  var shouldTrackWidth = lineWidth !== -1;
+  var previousLineBreak = -1; // count the first line correctly
+  var plain = isPlainSafeFirst(string.charCodeAt(0))
+          && !isWhitespace(string.charCodeAt(string.length - 1));
+
+  if (singleLineOnly) {
+    // Case: no block styles.
+    // Check for disallowed characters to rule out plain and single.
+    for (i = 0; i < string.length; i++) {
+      char = string.charCodeAt(i);
+      if (!isPrintable(char)) {
+        return STYLE_DOUBLE;
+      }
+      plain = plain && isPlainSafe(char);
+    }
+  } else {
+    // Case: block styles permitted.
+    for (i = 0; i < string.length; i++) {
+      char = string.charCodeAt(i);
+      if (char === CHAR_LINE_FEED) {
+        hasLineBreak = true;
+        // Check if any line can be folded.
+        if (shouldTrackWidth) {
+          hasFoldableLine = hasFoldableLine ||
+            // Foldable line = too long, and not more-indented.
+            (i - previousLineBreak - 1 > lineWidth &&
+             string[previousLineBreak + 1] !== ' ');
+          previousLineBreak = i;
+        }
+      } else if (!isPrintable(char)) {
+        return STYLE_DOUBLE;
+      }
+      plain = plain && isPlainSafe(char);
+    }
+    // in case the end is missing a \n
+    hasFoldableLine = hasFoldableLine || (shouldTrackWidth &&
+      (i - previousLineBreak - 1 > lineWidth &&
+       string[previousLineBreak + 1] !== ' '));
+  }
+  // Although every style can represent \n without escaping, prefer block styles
+  // for multiline, since they're more readable and they don't add empty lines.
+  // Also prefer folding a super-long line.
+  if (!hasLineBreak && !hasFoldableLine) {
+    // Strings interpretable as another type have to be quoted;
+    // e.g. the string 'true' vs. the boolean true.
+    return plain && !testAmbiguousType(string)
+      ? STYLE_PLAIN : STYLE_SINGLE;
+  }
+  // Edge case: block indentation indicator can only have one digit.
+  if (string[0] === ' ' && indentPerLevel > 9) {
+    return STYLE_DOUBLE;
+  }
+  // At this point we know block styles are valid.
+  // Prefer literal style unless we want to fold.
+  return hasFoldableLine ? STYLE_FOLDED : STYLE_LITERAL;
+}
+
+// Note: line breaking/folding is implemented for only the folded style.
+// NB. We drop the last trailing newline (if any) of a returned block scalar
+//  since the dumper adds its own newline. This always works:
+//    • No ending newline => unaffected; already using strip "-" chomping.
+//    • Ending newline    => removed then restored.
+//  Importantly, this keeps the "+" chomp indicator from gaining an extra line.
+function writeScalar(state, string, level, iskey) {
+  state.dump = (function () {
+    if (string.length === 0) {
+      return "''";
+    }
+    if (!state.noCompatMode &&
+        DEPRECATED_BOOLEANS_SYNTAX.indexOf(string) !== -1) {
+      return "'" + string + "'";
+    }
+
+    var indent = state.indent * Math.max(1, level); // no 0-indent scalars
+    // As indentation gets deeper, let the width decrease monotonically
+    // to the lower bound min(state.lineWidth, 40).
+    // Note that this implies
+    //  state.lineWidth ≤ 40 + state.indent: width is fixed at the lower bound.
+    //  state.lineWidth > 40 + state.indent: width decreases until the lower bound.
+    // This behaves better than a constant minimum width which disallows narrower options,
+    // or an indent threshold which causes the width to suddenly increase.
+    var lineWidth = state.lineWidth === -1
+      ? -1 : Math.max(Math.min(state.lineWidth, 40), state.lineWidth - indent);
+
+    // Without knowing if keys are implicit/explicit, assume implicit for safety.
+    var singleLineOnly = iskey
+      // No block styles in flow mode.
+      || (state.flowLevel > -1 && level >= state.flowLevel);
+    function testAmbiguity(string) {
+      return testImplicitResolving(state, string);
+    }
+
+    switch (chooseScalarStyle(string, singleLineOnly, state.indent, lineWidth, testAmbiguity)) {
+      case STYLE_PLAIN:
+        return string;
+      case STYLE_SINGLE:
+        return "'" + string.replace(/'/g, "''") + "'";
+      case STYLE_LITERAL:
+        return '|' + blockHeader(string, state.indent)
+          + dropEndingNewline(indentString(string, indent));
+      case STYLE_FOLDED:
+        return '>' + blockHeader(string, state.indent)
+          + dropEndingNewline(indentString(foldString(string, lineWidth), indent));
+      case STYLE_DOUBLE:
+        return '"' + escapeString(string, lineWidth) + '"';
+      default:
+        throw new YAMLException('impossible error: invalid scalar style');
+    }
+  }());
+}
+
+// Pre-conditions: string is valid for a block scalar, 1 <= indentPerLevel <= 9.
+function blockHeader(string, indentPerLevel) {
+  var indentIndicator = (string[0] === ' ') ? String(indentPerLevel) : '';
+
+  // note the special case: the string '\n' counts as a "trailing" empty line.
+  var clip =          string[string.length - 1] === '\n';
+  var keep = clip && (string[string.length - 2] === '\n' || string === '\n');
+  var chomp = keep ? '+' : (clip ? '' : '-');
+
+  return indentIndicator + chomp + '\n';
+}
+
+// (See the note for writeScalar.)
+function dropEndingNewline(string) {
+  return string[string.length - 1] === '\n' ? string.slice(0, -1) : string;
+}
+
+// Note: a long line without a suitable break point will exceed the width limit.
+// Pre-conditions: every char in str isPrintable, str.length > 0, width > 0.
+function foldString(string, width) {
+  // In folded style, $k$ consecutive newlines output as $k+1$ newlines—
+  // unless they're before or after a more-indented line, or at the very
+  // beginning or end, in which case $k$ maps to $k$.
+  // Therefore, parse each chunk as newline(s) followed by a content line.
+  var lineRe = /(\n+)([^\n]*)/g;
+
+  // first line (possibly an empty line)
+  var result = (function () {
+    var nextLF = string.indexOf('\n');
+    nextLF = nextLF !== -1 ? nextLF : string.length;
+    lineRe.lastIndex = nextLF;
+    return foldLine(string.slice(0, nextLF), width);
+  }());
+  // If we haven't reached the first content line yet, don't add an extra \n.
+  var prevMoreIndented = string[0] === '\n' || string[0] === ' ';
+  var moreIndented;
+
+  // rest of the lines
+  var match;
+  while ((match = lineRe.exec(string))) {
+    var prefix = match[1], line = match[2];
+    moreIndented = (line[0] === ' ');
+    result += prefix
+      + (!prevMoreIndented && !moreIndented && line !== ''
+        ? '\n' : '')
+      + foldLine(line, width);
+    prevMoreIndented = moreIndented;
+  }
+
+  return result;
+}
+
+// Greedy line breaking.
+// Picks the longest line under the limit each time,
+// otherwise settles for the shortest line over the limit.
+// NB. More-indented lines *cannot* be folded, as that would add an extra \n.
+function foldLine(line, width) {
+  if (line === '' || line[0] === ' ') return line;
+
+  // Since a more-indented line adds a \n, breaks can't be followed by a space.
+  var breakRe = / [^ ]/g; // note: the match index will always be <= length-2.
+  var match;
+  // start is an inclusive index. end, curr, and next are exclusive.
+  var start = 0, end, curr = 0, next = 0;
+  var result = '';
+
+  // Invariants: 0 <= start <= length-1.
+  //   0 <= curr <= next <= max(0, length-2). curr - start <= width.
+  // Inside the loop:
+  //   A match implies length >= 2, so curr and next are <= length-2.
+  while ((match = breakRe.exec(line))) {
+    next = match.index;
+    // maintain invariant: curr - start <= width
+    if (next - start > width) {
+      end = (curr > start) ? curr : next; // derive end <= length-2
+      result += '\n' + line.slice(start, end);
+      // skip the space that was output as \n
+      start = end + 1;                    // derive start <= length-1
+    }
+    curr = next;
+  }
+
+  // By the invariants, start <= length-1, so there is something left over.
+  // It is either the whole string or a part starting from non-whitespace.
+  result += '\n';
+  // Insert a break if the remainder is too long and there is a break available.
+  if (line.length - start > width && curr > start) {
+    result += line.slice(start, curr) + '\n' + line.slice(curr + 1);
+  } else {
+    result += line.slice(start);
+  }
+
+  return result.slice(1); // drop extra \n joiner
+}
+
+// Escapes a double-quoted string.
+function escapeString(string) {
+  var result = '';
+  var char;
+  var escapeSeq;
+
+  for (var i = 0; i < string.length; i++) {
+    char = string.charCodeAt(i);
+    escapeSeq = ESCAPE_SEQUENCES[char];
+    result += !escapeSeq && isPrintable(char)
+      ? string[i]
+      : escapeSeq || encodeHex(char);
+  }
+
+  return result;
+}
+
+function writeFlowSequence(state, level, object) {
+  var _result = '',
+      _tag    = state.tag,
+      index,
+      length;
+
+  for (index = 0, length = object.length; index < length; index += 1) {
+    // Write only valid elements.
+    if (writeNode(state, level, object[index], false, false)) {
+      if (index !== 0) _result += ', ';
+      _result += state.dump;
+    }
+  }
+
+  state.tag = _tag;
+  state.dump = '[' + _result + ']';
+}
+
+function writeBlockSequence(state, level, object, compact) {
+  var _result = '',
+      _tag    = state.tag,
+      index,
+      length;
+
+  for (index = 0, length = object.length; index < length; index += 1) {
+    // Write only valid elements.
+    if (writeNode(state, level + 1, object[index], true, true)) {
+      if (!compact || index !== 0) {
+        _result += generateNextLine(state, level);
+      }
+      _result += '- ' + state.dump;
+    }
+  }
+
+  state.tag = _tag;
+  state.dump = _result || '[]'; // Empty sequence if no valid values.
+}
+
+function writeFlowMapping(state, level, object) {
+  var _result       = '',
+      _tag          = state.tag,
+      objectKeyList = Object.keys(object),
+      index,
+      length,
+      objectKey,
+      objectValue,
+      pairBuffer;
+
+  for (index = 0, length = objectKeyList.length; index < length; index += 1) {
+    pairBuffer = '';
+
+    if (index !== 0) pairBuffer += ', ';
+
+    objectKey = objectKeyList[index];
+    objectValue = object[objectKey];
+
+    if (!writeNode(state, level, objectKey, false, false)) {
+      continue; // Skip this pair because of invalid key;
+    }
+
+    if (state.dump.length > 1024) pairBuffer += '? ';
+
+    pairBuffer += state.dump + ': ';
+
+    if (!writeNode(state, level, objectValue, false, false)) {
+      continue; // Skip this pair because of invalid value.
+    }
+
+    pairBuffer += state.dump;
+
+    // Both key and value are valid.
+    _result += pairBuffer;
+  }
+
+  state.tag = _tag;
+  state.dump = '{' + _result + '}';
+}
+
+function writeBlockMapping(state, level, object, compact) {
+  var _result       = '',
+      _tag          = state.tag,
+      objectKeyList = Object.keys(object),
+      index,
+      length,
+      objectKey,
+      objectValue,
+      explicitPair,
+      pairBuffer;
+
+  // Allow sorting keys so that the output file is deterministic
+  if (state.sortKeys === true) {
+    // Default sorting
+    objectKeyList.sort();
+  } else if (typeof state.sortKeys === 'function') {
+    // Custom sort function
+    objectKeyList.sort(state.sortKeys);
+  } else if (state.sortKeys) {
+    // Something is wrong
+    throw new YAMLException('sortKeys must be a boolean or a function');
+  }
+
+  for (index = 0, length = objectKeyList.length; index < length; index += 1) {
+    pairBuffer = '';
+
+    if (!compact || index !== 0) {
+      pairBuffer += generateNextLine(state, level);
+    }
+
+    objectKey = objectKeyList[index];
+    objectValue = object[objectKey];
+
+    if (!writeNode(state, level + 1, objectKey, true, true, true)) {
+      continue; // Skip this pair because of invalid key.
+    }
+
+    explicitPair = (state.tag !== null && state.tag !== '?') ||
+                   (state.dump && state.dump.length > 1024);
+
+    if (explicitPair) {
+      if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) {
+        pairBuffer += '?';
+      } else {
+        pairBuffer += '? ';
+      }
+    }
+
+    pairBuffer += state.dump;
+
+    if (explicitPair) {
+      pairBuffer += generateNextLine(state, level);
+    }
+
+    if (!writeNode(state, level + 1, objectValue, true, explicitPair)) {
+      continue; // Skip this pair because of invalid value.
+    }
+
+    if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) {
+      pairBuffer += ':';
+    } else {
+      pairBuffer += ': ';
+    }
+
+    pairBuffer += state.dump;
+
+    // Both key and value are valid.
+    _result += pairBuffer;
+  }
+
+  state.tag = _tag;
+  state.dump = _result || '{}'; // Empty mapping if no valid pairs.
+}
+
+function detectType(state, object, explicit) {
+  var _result, typeList, index, length, type, style;
+
+  typeList = explicit ? state.explicitTypes : state.implicitTypes;
+
+  for (index = 0, length = typeList.length; index < length; index += 1) {
+    type = typeList[index];
+
+    if ((type.instanceOf  || type.predicate) &&
+        (!type.instanceOf || ((typeof object === 'object') && (object instanceof type.instanceOf))) &&
+        (!type.predicate  || type.predicate(object))) {
+
+      state.tag = explicit ? type.tag : '?';
+
+      if (type.represent) {
+        style = state.styleMap[type.tag] || type.defaultStyle;
+
+        if (_toString.call(type.represent) === '[object Function]') {
+          _result = type.represent(object, style);
+        } else if (_hasOwnProperty.call(type.represent, style)) {
+          _result = type.represent[style](object, style);
+        } else {
+          throw new YAMLException('!<' + type.tag + '> tag resolver accepts not "' + style + '" style');
+        }
+
+        state.dump = _result;
+      }
+
+      return true;
+    }
+  }
+
+  return false;
+}
+
+// Serializes `object` and writes it to global `result`.
+// Returns true on success, or false on invalid object.
+//
+function writeNode(state, level, object, block, compact, iskey) {
+  state.tag = null;
+  state.dump = object;
+
+  if (!detectType(state, object, false)) {
+    detectType(state, object, true);
+  }
+
+  var type = _toString.call(state.dump);
+
+  if (block) {
+    block = (state.flowLevel < 0 || state.flowLevel > level);
+  }
+
+  var objectOrArray = type === '[object Object]' || type === '[object Array]',
+      duplicateIndex,
+      duplicate;
+
+  if (objectOrArray) {
+    duplicateIndex = state.duplicates.indexOf(object);
+    duplicate = duplicateIndex !== -1;
+  }
+
+  if ((state.tag !== null && state.tag !== '?') || duplicate || (state.indent !== 2 && level > 0)) {
+    compact = false;
+  }
+
+  if (duplicate && state.usedDuplicates[duplicateIndex]) {
+    state.dump = '*ref_' + duplicateIndex;
+  } else {
+    if (objectOrArray && duplicate && !state.usedDuplicates[duplicateIndex]) {
+      state.usedDuplicates[duplicateIndex] = true;
+    }
+    if (type === '[object Object]') {
+      if (block && (Object.keys(state.dump).length !== 0)) {
+        writeBlockMapping(state, level, state.dump, compact);
+        if (duplicate) {
+          state.dump = '&ref_' + duplicateIndex + state.dump;
+        }
+      } else {
+        writeFlowMapping(state, level, state.dump);
+        if (duplicate) {
+          state.dump = '&ref_' + duplicateIndex + ' ' + state.dump;
+        }
+      }
+    } else if (type === '[object Array]') {
+      if (block && (state.dump.length !== 0)) {
+        writeBlockSequence(state, level, state.dump, compact);
+        if (duplicate) {
+          state.dump = '&ref_' + duplicateIndex + state.dump;
+        }
+      } else {
+        writeFlowSequence(state, level, state.dump);
+        if (duplicate) {
+          state.dump = '&ref_' + duplicateIndex + ' ' + state.dump;
+        }
+      }
+    } else if (type === '[object String]') {
+      if (state.tag !== '?') {
+        writeScalar(state, state.dump, level, iskey);
+      }
+    } else {
+      if (state.skipInvalid) return false;
+      throw new YAMLException('unacceptable kind of an object to dump ' + type);
+    }
+
+    if (state.tag !== null && state.tag !== '?') {
+      state.dump = '!<' + state.tag + '> ' + state.dump;
+    }
+  }
+
+  return true;
+}
+
+function getDuplicateReferences(object, state) {
+  var objects = [],
+      duplicatesIndexes = [],
+      index,
+      length;
+
+  inspectNode(object, objects, duplicatesIndexes);
+
+  for (index = 0, length = duplicatesIndexes.length; index < length; index += 1) {
+    state.duplicates.push(objects[duplicatesIndexes[index]]);
+  }
+  state.usedDuplicates = new Array(length);
+}
+
+function inspectNode(object, objects, duplicatesIndexes) {
+  var objectKeyList,
+      index,
+      length;
+
+  if (object !== null && typeof object === 'object') {
+    index = objects.indexOf(object);
+    if (index !== -1) {
+      if (duplicatesIndexes.indexOf(index) === -1) {
+        duplicatesIndexes.push(index);
+      }
+    } else {
+      objects.push(object);
+
+      if (Array.isArray(object)) {
+        for (index = 0, length = object.length; index < length; index += 1) {
+          inspectNode(object[index], objects, duplicatesIndexes);
+        }
+      } else {
+        objectKeyList = Object.keys(object);
+
+        for (index = 0, length = objectKeyList.length; index < length; index += 1) {
+          inspectNode(object[objectKeyList[index]], objects, duplicatesIndexes);
+        }
+      }
+    }
+  }
+}
+
+function dump(input, options) {
+  options = options || {};
+
+  var state = new State(options);
+
+  if (!state.noRefs) getDuplicateReferences(input, state);
+
+  if (writeNode(state, 0, input, true, true)) return state.dump + '\n';
+
+  return '';
+}
+
+function safeDump(input, options) {
+  return dump(input, common.extend({ schema: DEFAULT_SAFE_SCHEMA }, options));
+}
+
+module.exports.dump     = dump;
+module.exports.safeDump = safeDump;
+
+},{"./common":2,"./exception":4,"./schema/default_full":9,"./schema/default_safe":10}],4:[function(require,module,exports){
+// YAML error class. http://stackoverflow.com/questions/8458984
+//
+'use strict';
+
+function YAMLException(reason, mark) {
+  // Super constructor
+  Error.call(this);
+
+  // Include stack trace in error object
+  if (Error.captureStackTrace) {
+    // Chrome and NodeJS
+    Error.captureStackTrace(this, this.constructor);
+  } else {
+    // FF, IE 10+ and Safari 6+. Fallback for others
+    this.stack = (new Error()).stack || '';
+  }
+
+  this.name = 'YAMLException';
+  this.reason = reason;
+  this.mark = mark;
+  this.message = (this.reason || '(unknown reason)') + (this.mark ? ' ' + this.mark.toString() : '');
+}
+
+
+// Inherit from Error
+YAMLException.prototype = Object.create(Error.prototype);
+YAMLException.prototype.constructor = YAMLException;
+
+
+YAMLException.prototype.toString = function toString(compact) {
+  var result = this.name + ': ';
+
+  result += this.reason || '(unknown reason)';
+
+  if (!compact && this.mark) {
+    result += ' ' + this.mark.toString();
+  }
+
+  return result;
+};
+
+
+module.exports = YAMLException;
+
+},{}],5:[function(require,module,exports){
+'use strict';
+
+/*eslint-disable max-len,no-use-before-define*/
+
+var common              = require('./common');
+var YAMLException       = require('./exception');
+var Mark                = require('./mark');
+var DEFAULT_SAFE_SCHEMA = require('./schema/default_safe');
+var DEFAULT_FULL_SCHEMA = require('./schema/default_full');
+
+
+var _hasOwnProperty = Object.prototype.hasOwnProperty;
+
+
+var CONTEXT_FLOW_IN   = 1;
+var CONTEXT_FLOW_OUT  = 2;
+var CONTEXT_BLOCK_IN  = 3;
+var CONTEXT_BLOCK_OUT = 4;
+
+
+var CHOMPING_CLIP  = 1;
+var CHOMPING_STRIP = 2;
+var CHOMPING_KEEP  = 3;
+
+
+var PATTERN_NON_PRINTABLE         = /[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x84\x86-\x9F\uFFFE\uFFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])|(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF]/;
+var PATTERN_NON_ASCII_LINE_BREAKS = /[\x85\u2028\u2029]/;
+var PATTERN_FLOW_INDICATORS       = /[,\[\]\{\}]/;
+var PATTERN_TAG_HANDLE            = /^(?:!|!!|![a-z\-]+!)$/i;
+var PATTERN_TAG_URI               = /^(?:!|[^,\[\]\{\}])(?:%[0-9a-f]{2}|[0-9a-z\-#;\/\?:@&=\+\$,_\.!~\*'\(\)\[\]])*$/i;
+
+
+function is_EOL(c) {
+  return (c === 0x0A/* LF */) || (c === 0x0D/* CR */);
+}
+
+function is_WHITE_SPACE(c) {
+  return (c === 0x09/* Tab */) || (c === 0x20/* Space */);
+}
+
+function is_WS_OR_EOL(c) {
+  return (c === 0x09/* Tab */) ||
+         (c === 0x20/* Space */) ||
+         (c === 0x0A/* LF */) ||
+         (c === 0x0D/* CR */);
+}
+
+function is_FLOW_INDICATOR(c) {
+  return c === 0x2C/* , */ ||
+         c === 0x5B/* [ */ ||
+         c === 0x5D/* ] */ ||
+         c === 0x7B/* { */ ||
+         c === 0x7D/* } */;
+}
+
+function fromHexCode(c) {
+  var lc;
+
+  if ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */)) {
+    return c - 0x30;
+  }
+
+  /*eslint-disable no-bitwise*/
+  lc = c | 0x20;
+
+  if ((0x61/* a */ <= lc) && (lc <= 0x66/* f */)) {
+    return lc - 0x61 + 10;
+  }
+
+  return -1;
+}
+
+function escapedHexLen(c) {
+  if (c === 0x78/* x */) { return 2; }
+  if (c === 0x75/* u */) { return 4; }
+  if (c === 0x55/* U */) { return 8; }
+  return 0;
+}
+
+function fromDecimalCode(c) {
+  if ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */)) {
+    return c - 0x30;
+  }
+
+  return -1;
+}
+
+function simpleEscapeSequence(c) {
+  return (c === 0x30/* 0 */) ? '\x00' :
+        (c === 0x61/* a */) ? '\x07' :
+        (c === 0x62/* b */) ? '\x08' :
+        (c === 0x74/* t */) ? '\x09' :
+        (c === 0x09/* Tab */) ? '\x09' :
+        (c === 0x6E/* n */) ? '\x0A' :
+        (c === 0x76/* v */) ? '\x0B' :
+        (c === 0x66/* f */) ? '\x0C' :
+        (c === 0x72/* r */) ? '\x0D' :
+        (c === 0x65/* e */) ? '\x1B' :
+        (c === 0x20/* Space */) ? ' ' :
+        (c === 0x22/* " */) ? '\x22' :
+        (c === 0x2F/* / */) ? '/' :
+        (c === 0x5C/* \ */) ? '\x5C' :
+        (c === 0x4E/* N */) ? '\x85' :
+        (c === 0x5F/* _ */) ? '\xA0' :
+        (c === 0x4C/* L */) ? '\u2028' :
+        (c === 0x50/* P */) ? '\u2029' : '';
+}
+
+function charFromCodepoint(c) {
+  if (c <= 0xFFFF) {
+    return String.fromCharCode(c);
+  }
+  // Encode UTF-16 surrogate pair
+  // https://en.wikipedia.org/wiki/UTF-16#Code_points_U.2B010000_to_U.2B10FFFF
+  return String.fromCharCode(((c - 0x010000) >> 10) + 0xD800,
+                             ((c - 0x010000) & 0x03FF) + 0xDC00);
+}
+
+var simpleEscapeCheck = new Array(256); // integer, for fast access
+var simpleEscapeMap = new Array(256);
+for (var i = 0; i < 256; i++) {
+  simpleEscapeCheck[i] = simpleEscapeSequence(i) ? 1 : 0;
+  simpleEscapeMap[i] = simpleEscapeSequence(i);
+}
+
+
+function State(input, options) {
+  this.input = input;
+
+  this.filename  = options['filename']  || null;
+  this.schema    = options['schema']    || DEFAULT_FULL_SCHEMA;
+  this.onWarning = options['onWarning'] || null;
+  this.legacy    = options['legacy']    || false;
+  this.json      = options['json']      || false;
+  this.listener  = options['listener']  || null;
+
+  this.implicitTypes = this.schema.compiledImplicit;
+  this.typeMap       = this.schema.compiledTypeMap;
+
+  this.length     = input.length;
+  this.position   = 0;
+  this.line       = 0;
+  this.lineStart  = 0;
+  this.lineIndent = 0;
+
+  this.documents = [];
+
+  /*
+  this.version;
+  this.checkLineBreaks;
+  this.tagMap;
+  this.anchorMap;
+  this.tag;
+  this.anchor;
+  this.kind;
+  this.result;*/
+
+}
+
+
+function generateError(state, message) {
+  return new YAMLException(
+    message,
+    new Mark(state.filename, state.input, state.position, state.line, (state.position - state.lineStart)));
+}
+
+function throwError(state, message) {
+  throw generateError(state, message);
+}
+
+function throwWarning(state, message) {
+  if (state.onWarning) {
+    state.onWarning.call(null, generateError(state, message));
+  }
+}
+
+
+var directiveHandlers = {
+
+  YAML: function handleYamlDirective(state, name, args) {
+
+    var match, major, minor;
+
+    if (state.version !== null) {
+      throwError(state, 'duplication of %YAML directive');
+    }
+
+    if (args.length !== 1) {
+      throwError(state, 'YAML directive accepts exactly one argument');
+    }
+
+    match = /^([0-9]+)\.([0-9]+)$/.exec(args[0]);
+
+    if (match === null) {
+      throwError(state, 'ill-formed argument of the YAML directive');
+    }
+
+    major = parseInt(match[1], 10);
+    minor = parseInt(match[2], 10);
+
+    if (major !== 1) {
+      throwError(state, 'unacceptable YAML version of the document');
+    }
+
+    state.version = args[0];
+    state.checkLineBreaks = (minor < 2);
+
+    if (minor !== 1 && minor !== 2) {
+      throwWarning(state, 'unsupported YAML version of the document');
+    }
+  },
+
+  TAG: function handleTagDirective(state, name, args) {
+
+    var handle, prefix;
+
+    if (args.length !== 2) {
+      throwError(state, 'TAG directive accepts exactly two arguments');
+    }
+
+    handle = args[0];
+    prefix = args[1];
+
+    if (!PATTERN_TAG_HANDLE.test(handle)) {
+      throwError(state, 'ill-formed tag handle (first argument) of the TAG directive');
+    }
+
+    if (_hasOwnProperty.call(state.tagMap, handle)) {
+      throwError(state, 'there is a previously declared suffix for "' + handle + '" tag handle');
+    }
+
+    if (!PATTERN_TAG_URI.test(prefix)) {
+      throwError(state, 'ill-formed tag prefix (second argument) of the TAG directive');
+    }
+
+    state.tagMap[handle] = prefix;
+  }
+};
+
+
+function captureSegment(state, start, end, checkJson) {
+  var _position, _length, _character, _result;
+
+  if (start < end) {
+    _result = state.input.slice(start, end);
+
+    if (checkJson) {
+      for (_position = 0, _length = _result.length;
+           _position < _length;
+           _position += 1) {
+        _character = _result.charCodeAt(_position);
+        if (!(_character === 0x09 ||
+              (0x20 <= _character && _character <= 0x10FFFF))) {
+          throwError(state, 'expected valid JSON character');
+        }
+      }
+    } else if (PATTERN_NON_PRINTABLE.test(_result)) {
+      throwError(state, 'the stream contains non-printable characters');
+    }
+
+    state.result += _result;
+  }
+}
+
+function mergeMappings(state, destination, source, overridableKeys) {
+  var sourceKeys, key, index, quantity;
+
+  if (!common.isObject(source)) {
+    throwError(state, 'cannot merge mappings; the provided source object is unacceptable');
+  }
+
+  sourceKeys = Object.keys(source);
+
+  for (index = 0, quantity = sourceKeys.length; index < quantity; index += 1) {
+    key = sourceKeys[index];
+
+    if (!_hasOwnProperty.call(destination, key)) {
+      destination[key] = source[key];
+      overridableKeys[key] = true;
+    }
+  }
+}
+
+function storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode) {
+  var index, quantity;
+
+  keyNode = String(keyNode);
+
+  if (_result === null) {
+    _result = {};
+  }
+
+  if (keyTag === 'tag:yaml.org,2002:merge') {
+    if (Array.isArray(valueNode)) {
+      for (index = 0, quantity = valueNode.length; index < quantity; index += 1) {
+        mergeMappings(state, _result, valueNode[index], overridableKeys);
+      }
+    } else {
+      mergeMappings(state, _result, valueNode, overridableKeys);
+    }
+  } else {
+    if (!state.json &&
+        !_hasOwnProperty.call(overridableKeys, keyNode) &&
+        _hasOwnProperty.call(_result, keyNode)) {
+      throwError(state, 'duplicated mapping key');
+    }
+    _result[keyNode] = valueNode;
+    delete overridableKeys[keyNode];
+  }
+
+  return _result;
+}
+
+function readLineBreak(state) {
+  var ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch === 0x0A/* LF */) {
+    state.position++;
+  } else if (ch === 0x0D/* CR */) {
+    state.position++;
+    if (state.input.charCodeAt(state.position) === 0x0A/* LF */) {
+      state.position++;
+    }
+  } else {
+    throwError(state, 'a line break is expected');
+  }
+
+  state.line += 1;
+  state.lineStart = state.position;
+}
+
+function skipSeparationSpace(state, allowComments, checkIndent) {
+  var lineBreaks = 0,
+      ch = state.input.charCodeAt(state.position);
+
+  while (ch !== 0) {
+    while (is_WHITE_SPACE(ch)) {
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    if (allowComments && ch === 0x23/* # */) {
+      do {
+        ch = state.input.charCodeAt(++state.position);
+      } while (ch !== 0x0A/* LF */ && ch !== 0x0D/* CR */ && ch !== 0);
+    }
+
+    if (is_EOL(ch)) {
+      readLineBreak(state);
+
+      ch = state.input.charCodeAt(state.position);
+      lineBreaks++;
+      state.lineIndent = 0;
+
+      while (ch === 0x20/* Space */) {
+        state.lineIndent++;
+        ch = state.input.charCodeAt(++state.position);
+      }
+    } else {
+      break;
+    }
+  }
+
+  if (checkIndent !== -1 && lineBreaks !== 0 && state.lineIndent < checkIndent) {
+    throwWarning(state, 'deficient indentation');
+  }
+
+  return lineBreaks;
+}
+
+function testDocumentSeparator(state) {
+  var _position = state.position,
+      ch;
+
+  ch = state.input.charCodeAt(_position);
+
+  // Condition state.position === state.lineStart is tested
+  // in parent on each call, for efficiency. No needs to test here again.
+  if ((ch === 0x2D/* - */ || ch === 0x2E/* . */) &&
+      ch === state.input.charCodeAt(_position + 1) &&
+      ch === state.input.charCodeAt(_position + 2)) {
+
+    _position += 3;
+
+    ch = state.input.charCodeAt(_position);
+
+    if (ch === 0 || is_WS_OR_EOL(ch)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+function writeFoldedLines(state, count) {
+  if (count === 1) {
+    state.result += ' ';
+  } else if (count > 1) {
+    state.result += common.repeat('\n', count - 1);
+  }
+}
+
+
+function readPlainScalar(state, nodeIndent, withinFlowCollection) {
+  var preceding,
+      following,
+      captureStart,
+      captureEnd,
+      hasPendingContent,
+      _line,
+      _lineStart,
+      _lineIndent,
+      _kind = state.kind,
+      _result = state.result,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (is_WS_OR_EOL(ch)      ||
+      is_FLOW_INDICATOR(ch) ||
+      ch === 0x23/* # */    ||
+      ch === 0x26/* & */    ||
+      ch === 0x2A/* * */    ||
+      ch === 0x21/* ! */    ||
+      ch === 0x7C/* | */    ||
+      ch === 0x3E/* > */    ||
+      ch === 0x27/* ' */    ||
+      ch === 0x22/* " */    ||
+      ch === 0x25/* % */    ||
+      ch === 0x40/* @ */    ||
+      ch === 0x60/* ` */) {
+    return false;
+  }
+
+  if (ch === 0x3F/* ? */ || ch === 0x2D/* - */) {
+    following = state.input.charCodeAt(state.position + 1);
+
+    if (is_WS_OR_EOL(following) ||
+        withinFlowCollection && is_FLOW_INDICATOR(following)) {
+      return false;
+    }
+  }
+
+  state.kind = 'scalar';
+  state.result = '';
+  captureStart = captureEnd = state.position;
+  hasPendingContent = false;
+
+  while (ch !== 0) {
+    if (ch === 0x3A/* : */) {
+      following = state.input.charCodeAt(state.position + 1);
+
+      if (is_WS_OR_EOL(following) ||
+          withinFlowCollection && is_FLOW_INDICATOR(following)) {
+        break;
+      }
+
+    } else if (ch === 0x23/* # */) {
+      preceding = state.input.charCodeAt(state.position - 1);
+
+      if (is_WS_OR_EOL(preceding)) {
+        break;
+      }
+
+    } else if ((state.position === state.lineStart && testDocumentSeparator(state)) ||
+               withinFlowCollection && is_FLOW_INDICATOR(ch)) {
+      break;
+
+    } else if (is_EOL(ch)) {
+      _line = state.line;
+      _lineStart = state.lineStart;
+      _lineIndent = state.lineIndent;
+      skipSeparationSpace(state, false, -1);
+
+      if (state.lineIndent >= nodeIndent) {
+        hasPendingContent = true;
+        ch = state.input.charCodeAt(state.position);
+        continue;
+      } else {
+        state.position = captureEnd;
+        state.line = _line;
+        state.lineStart = _lineStart;
+        state.lineIndent = _lineIndent;
+        break;
+      }
+    }
+
+    if (hasPendingContent) {
+      captureSegment(state, captureStart, captureEnd, false);
+      writeFoldedLines(state, state.line - _line);
+      captureStart = captureEnd = state.position;
+      hasPendingContent = false;
+    }
+
+    if (!is_WHITE_SPACE(ch)) {
+      captureEnd = state.position + 1;
+    }
+
+    ch = state.input.charCodeAt(++state.position);
+  }
+
+  captureSegment(state, captureStart, captureEnd, false);
+
+  if (state.result) {
+    return true;
+  }
+
+  state.kind = _kind;
+  state.result = _result;
+  return false;
+}
+
+function readSingleQuotedScalar(state, nodeIndent) {
+  var ch,
+      captureStart, captureEnd;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch !== 0x27/* ' */) {
+    return false;
+  }
+
+  state.kind = 'scalar';
+  state.result = '';
+  state.position++;
+  captureStart = captureEnd = state.position;
+
+  while ((ch = state.input.charCodeAt(state.position)) !== 0) {
+    if (ch === 0x27/* ' */) {
+      captureSegment(state, captureStart, state.position, true);
+      ch = state.input.charCodeAt(++state.position);
+
+      if (ch === 0x27/* ' */) {
+        captureStart = state.position;
+        state.position++;
+        captureEnd = state.position;
+      } else {
+        return true;
+      }
+
+    } else if (is_EOL(ch)) {
+      captureSegment(state, captureStart, captureEnd, true);
+      writeFoldedLines(state, skipSeparationSpace(state, false, nodeIndent));
+      captureStart = captureEnd = state.position;
+
+    } else if (state.position === state.lineStart && testDocumentSeparator(state)) {
+      throwError(state, 'unexpected end of the document within a single quoted scalar');
+
+    } else {
+      state.position++;
+      captureEnd = state.position;
+    }
+  }
+
+  throwError(state, 'unexpected end of the stream within a single quoted scalar');
+}
+
+function readDoubleQuotedScalar(state, nodeIndent) {
+  var captureStart,
+      captureEnd,
+      hexLength,
+      hexResult,
+      tmp,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch !== 0x22/* " */) {
+    return false;
+  }
+
+  state.kind = 'scalar';
+  state.result = '';
+  state.position++;
+  captureStart = captureEnd = state.position;
+
+  while ((ch = state.input.charCodeAt(state.position)) !== 0) {
+    if (ch === 0x22/* " */) {
+      captureSegment(state, captureStart, state.position, true);
+      state.position++;
+      return true;
+
+    } else if (ch === 0x5C/* \ */) {
+      captureSegment(state, captureStart, state.position, true);
+      ch = state.input.charCodeAt(++state.position);
+
+      if (is_EOL(ch)) {
+        skipSeparationSpace(state, false, nodeIndent);
+
+        // TODO: rework to inline fn with no type cast?
+      } else if (ch < 256 && simpleEscapeCheck[ch]) {
+        state.result += simpleEscapeMap[ch];
+        state.position++;
+
+      } else if ((tmp = escapedHexLen(ch)) > 0) {
+        hexLength = tmp;
+        hexResult = 0;
+
+        for (; hexLength > 0; hexLength--) {
+          ch = state.input.charCodeAt(++state.position);
+
+          if ((tmp = fromHexCode(ch)) >= 0) {
+            hexResult = (hexResult << 4) + tmp;
+
+          } else {
+            throwError(state, 'expected hexadecimal character');
+          }
+        }
+
+        state.result += charFromCodepoint(hexResult);
+
+        state.position++;
+
+      } else {
+        throwError(state, 'unknown escape sequence');
+      }
+
+      captureStart = captureEnd = state.position;
+
+    } else if (is_EOL(ch)) {
+      captureSegment(state, captureStart, captureEnd, true);
+      writeFoldedLines(state, skipSeparationSpace(state, false, nodeIndent));
+      captureStart = captureEnd = state.position;
+
+    } else if (state.position === state.lineStart && testDocumentSeparator(state)) {
+      throwError(state, 'unexpected end of the document within a double quoted scalar');
+
+    } else {
+      state.position++;
+      captureEnd = state.position;
+    }
+  }
+
+  throwError(state, 'unexpected end of the stream within a double quoted scalar');
+}
+
+function readFlowCollection(state, nodeIndent) {
+  var readNext = true,
+      _line,
+      _tag     = state.tag,
+      _result,
+      _anchor  = state.anchor,
+      following,
+      terminator,
+      isPair,
+      isExplicitPair,
+      isMapping,
+      overridableKeys = {},
+      keyNode,
+      keyTag,
+      valueNode,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch === 0x5B/* [ */) {
+    terminator = 0x5D;/* ] */
+    isMapping = false;
+    _result = [];
+  } else if (ch === 0x7B/* { */) {
+    terminator = 0x7D;/* } */
+    isMapping = true;
+    _result = {};
+  } else {
+    return false;
+  }
+
+  if (state.anchor !== null) {
+    state.anchorMap[state.anchor] = _result;
+  }
+
+  ch = state.input.charCodeAt(++state.position);
+
+  while (ch !== 0) {
+    skipSeparationSpace(state, true, nodeIndent);
+
+    ch = state.input.charCodeAt(state.position);
+
+    if (ch === terminator) {
+      state.position++;
+      state.tag = _tag;
+      state.anchor = _anchor;
+      state.kind = isMapping ? 'mapping' : 'sequence';
+      state.result = _result;
+      return true;
+    } else if (!readNext) {
+      throwError(state, 'missed comma between flow collection entries');
+    }
+
+    keyTag = keyNode = valueNode = null;
+    isPair = isExplicitPair = false;
+
+    if (ch === 0x3F/* ? */) {
+      following = state.input.charCodeAt(state.position + 1);
+
+      if (is_WS_OR_EOL(following)) {
+        isPair = isExplicitPair = true;
+        state.position++;
+        skipSeparationSpace(state, true, nodeIndent);
+      }
+    }
+
+    _line = state.line;
+    composeNode(state, nodeIndent, CONTEXT_FLOW_IN, false, true);
+    keyTag = state.tag;
+    keyNode = state.result;
+    skipSeparationSpace(state, true, nodeIndent);
+
+    ch = state.input.charCodeAt(state.position);
+
+    if ((isExplicitPair || state.line === _line) && ch === 0x3A/* : */) {
+      isPair = true;
+      ch = state.input.charCodeAt(++state.position);
+      skipSeparationSpace(state, true, nodeIndent);
+      composeNode(state, nodeIndent, CONTEXT_FLOW_IN, false, true);
+      valueNode = state.result;
+    }
+
+    if (isMapping) {
+      storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode);
+    } else if (isPair) {
+      _result.push(storeMappingPair(state, null, overridableKeys, keyTag, keyNode, valueNode));
+    } else {
+      _result.push(keyNode);
+    }
+
+    skipSeparationSpace(state, true, nodeIndent);
+
+    ch = state.input.charCodeAt(state.position);
+
+    if (ch === 0x2C/* , */) {
+      readNext = true;
+      ch = state.input.charCodeAt(++state.position);
+    } else {
+      readNext = false;
+    }
+  }
+
+  throwError(state, 'unexpected end of the stream within a flow collection');
+}
+
+function readBlockScalar(state, nodeIndent) {
+  var captureStart,
+      folding,
+      chomping       = CHOMPING_CLIP,
+      didReadContent = false,
+      detectedIndent = false,
+      textIndent     = nodeIndent,
+      emptyLines     = 0,
+      atMoreIndented = false,
+      tmp,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch === 0x7C/* | */) {
+    folding = false;
+  } else if (ch === 0x3E/* > */) {
+    folding = true;
+  } else {
+    return false;
+  }
+
+  state.kind = 'scalar';
+  state.result = '';
+
+  while (ch !== 0) {
+    ch = state.input.charCodeAt(++state.position);
+
+    if (ch === 0x2B/* + */ || ch === 0x2D/* - */) {
+      if (CHOMPING_CLIP === chomping) {
+        chomping = (ch === 0x2B/* + */) ? CHOMPING_KEEP : CHOMPING_STRIP;
+      } else {
+        throwError(state, 'repeat of a chomping mode identifier');
+      }
+
+    } else if ((tmp = fromDecimalCode(ch)) >= 0) {
+      if (tmp === 0) {
+        throwError(state, 'bad explicit indentation width of a block scalar; it cannot be less than one');
+      } else if (!detectedIndent) {
+        textIndent = nodeIndent + tmp - 1;
+        detectedIndent = true;
+      } else {
+        throwError(state, 'repeat of an indentation width identifier');
+      }
+
+    } else {
+      break;
+    }
+  }
+
+  if (is_WHITE_SPACE(ch)) {
+    do { ch = state.input.charCodeAt(++state.position); }
+    while (is_WHITE_SPACE(ch));
+
+    if (ch === 0x23/* # */) {
+      do { ch = state.input.charCodeAt(++state.position); }
+      while (!is_EOL(ch) && (ch !== 0));
+    }
+  }
+
+  while (ch !== 0) {
+    readLineBreak(state);
+    state.lineIndent = 0;
+
+    ch = state.input.charCodeAt(state.position);
+
+    while ((!detectedIndent || state.lineIndent < textIndent) &&
+           (ch === 0x20/* Space */)) {
+      state.lineIndent++;
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    if (!detectedIndent && state.lineIndent > textIndent) {
+      textIndent = state.lineIndent;
+    }
+
+    if (is_EOL(ch)) {
+      emptyLines++;
+      continue;
+    }
+
+    // End of the scalar.
+    if (state.lineIndent < textIndent) {
+
+      // Perform the chomping.
+      if (chomping === CHOMPING_KEEP) {
+        state.result += common.repeat('\n', didReadContent ? 1 + emptyLines : emptyLines);
+      } else if (chomping === CHOMPING_CLIP) {
+        if (didReadContent) { // i.e. only if the scalar is not empty.
+          state.result += '\n';
+        }
+      }
+
+      // Break this `while` cycle and go to the funciton's epilogue.
+      break;
+    }
+
+    // Folded style: use fancy rules to handle line breaks.
+    if (folding) {
+
+      // Lines starting with white space characters (more-indented lines) are not folded.
+      if (is_WHITE_SPACE(ch)) {
+        atMoreIndented = true;
+        // except for the first content line (cf. Example 8.1)
+        state.result += common.repeat('\n', didReadContent ? 1 + emptyLines : emptyLines);
+
+      // End of more-indented block.
+      } else if (atMoreIndented) {
+        atMoreIndented = false;
+        state.result += common.repeat('\n', emptyLines + 1);
+
+      // Just one line break - perceive as the same line.
+      } else if (emptyLines === 0) {
+        if (didReadContent) { // i.e. only if we have already read some scalar content.
+          state.result += ' ';
+        }
+
+      // Several line breaks - perceive as different lines.
+      } else {
+        state.result += common.repeat('\n', emptyLines);
+      }
+
+    // Literal style: just add exact number of line breaks between content lines.
+    } else {
+      // Keep all line breaks except the header line break.
+      state.result += common.repeat('\n', didReadContent ? 1 + emptyLines : emptyLines);
+    }
+
+    didReadContent = true;
+    detectedIndent = true;
+    emptyLines = 0;
+    captureStart = state.position;
+
+    while (!is_EOL(ch) && (ch !== 0)) {
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    captureSegment(state, captureStart, state.position, false);
+  }
+
+  return true;
+}
+
+function readBlockSequence(state, nodeIndent) {
+  var _line,
+      _tag      = state.tag,
+      _anchor   = state.anchor,
+      _result   = [],
+      following,
+      detected  = false,
+      ch;
+
+  if (state.anchor !== null) {
+    state.anchorMap[state.anchor] = _result;
+  }
+
+  ch = state.input.charCodeAt(state.position);
+
+  while (ch !== 0) {
+
+    if (ch !== 0x2D/* - */) {
+      break;
+    }
+
+    following = state.input.charCodeAt(state.position + 1);
+
+    if (!is_WS_OR_EOL(following)) {
+      break;
+    }
+
+    detected = true;
+    state.position++;
+
+    if (skipSeparationSpace(state, true, -1)) {
+      if (state.lineIndent <= nodeIndent) {
+        _result.push(null);
+        ch = state.input.charCodeAt(state.position);
+        continue;
+      }
+    }
+
+    _line = state.line;
+    composeNode(state, nodeIndent, CONTEXT_BLOCK_IN, false, true);
+    _result.push(state.result);
+    skipSeparationSpace(state, true, -1);
+
+    ch = state.input.charCodeAt(state.position);
+
+    if ((state.line === _line || state.lineIndent > nodeIndent) && (ch !== 0)) {
+      throwError(state, 'bad indentation of a sequence entry');
+    } else if (state.lineIndent < nodeIndent) {
+      break;
+    }
+  }
+
+  if (detected) {
+    state.tag = _tag;
+    state.anchor = _anchor;
+    state.kind = 'sequence';
+    state.result = _result;
+    return true;
+  }
+  return false;
+}
+
+function readBlockMapping(state, nodeIndent, flowIndent) {
+  var following,
+      allowCompact,
+      _line,
+      _tag          = state.tag,
+      _anchor       = state.anchor,
+      _result       = {},
+      overridableKeys = {},
+      keyTag        = null,
+      keyNode       = null,
+      valueNode     = null,
+      atExplicitKey = false,
+      detected      = false,
+      ch;
+
+  if (state.anchor !== null) {
+    state.anchorMap[state.anchor] = _result;
+  }
+
+  ch = state.input.charCodeAt(state.position);
+
+  while (ch !== 0) {
+    following = state.input.charCodeAt(state.position + 1);
+    _line = state.line; // Save the current line.
+
+    //
+    // Explicit notation case. There are two separate blocks:
+    // first for the key (denoted by "?") and second for the value (denoted by ":")
+    //
+    if ((ch === 0x3F/* ? */ || ch === 0x3A/* : */) && is_WS_OR_EOL(following)) {
+
+      if (ch === 0x3F/* ? */) {
+        if (atExplicitKey) {
+          storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null);
+          keyTag = keyNode = valueNode = null;
+        }
+
+        detected = true;
+        atExplicitKey = true;
+        allowCompact = true;
+
+      } else if (atExplicitKey) {
+        // i.e. 0x3A/* : */ === character after the explicit key.
+        atExplicitKey = false;
+        allowCompact = true;
+
+      } else {
+        throwError(state, 'incomplete explicit mapping pair; a key node is missed');
+      }
+
+      state.position += 1;
+      ch = following;
+
+    //
+    // Implicit notation case. Flow-style node as the key first, then ":", and the value.
+    //
+    } else if (composeNode(state, flowIndent, CONTEXT_FLOW_OUT, false, true)) {
+
+      if (state.line === _line) {
+        ch = state.input.charCodeAt(state.position);
+
+        while (is_WHITE_SPACE(ch)) {
+          ch = state.input.charCodeAt(++state.position);
+        }
+
+        if (ch === 0x3A/* : */) {
+          ch = state.input.charCodeAt(++state.position);
+
+          if (!is_WS_OR_EOL(ch)) {
+            throwError(state, 'a whitespace character is expected after the key-value separator within a block mapping');
+          }
+
+          if (atExplicitKey) {
+            storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null);
+            keyTag = keyNode = valueNode = null;
+          }
+
+          detected = true;
+          atExplicitKey = false;
+          allowCompact = false;
+          keyTag = state.tag;
+          keyNode = state.result;
+
+        } else if (detected) {
+          throwError(state, 'can not read an implicit mapping pair; a colon is missed');
+
+        } else {
+          state.tag = _tag;
+          state.anchor = _anchor;
+          return true; // Keep the result of `composeNode`.
+        }
+
+      } else if (detected) {
+        throwError(state, 'can not read a block mapping entry; a multiline key may not be an implicit key');
+
+      } else {
+        state.tag = _tag;
+        state.anchor = _anchor;
+        return true; // Keep the result of `composeNode`.
+      }
+
+    } else {
+      break; // Reading is done. Go to the epilogue.
+    }
+
+    //
+    // Common reading code for both explicit and implicit notations.
+    //
+    if (state.line === _line || state.lineIndent > nodeIndent) {
+      if (composeNode(state, nodeIndent, CONTEXT_BLOCK_OUT, true, allowCompact)) {
+        if (atExplicitKey) {
+          keyNode = state.result;
+        } else {
+          valueNode = state.result;
+        }
+      }
+
+      if (!atExplicitKey) {
+        storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode);
+        keyTag = keyNode = valueNode = null;
+      }
+
+      skipSeparationSpace(state, true, -1);
+      ch = state.input.charCodeAt(state.position);
+    }
+
+    if (state.lineIndent > nodeIndent && (ch !== 0)) {
+      throwError(state, 'bad indentation of a mapping entry');
+    } else if (state.lineIndent < nodeIndent) {
+      break;
+    }
+  }
+
+  //
+  // Epilogue.
+  //
+
+  // Special case: last mapping's node contains only the key in explicit notation.
+  if (atExplicitKey) {
+    storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null);
+  }
+
+  // Expose the resulting mapping.
+  if (detected) {
+    state.tag = _tag;
+    state.anchor = _anchor;
+    state.kind = 'mapping';
+    state.result = _result;
+  }
+
+  return detected;
+}
+
+function readTagProperty(state) {
+  var _position,
+      isVerbatim = false,
+      isNamed    = false,
+      tagHandle,
+      tagName,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch !== 0x21/* ! */) return false;
+
+  if (state.tag !== null) {
+    throwError(state, 'duplication of a tag property');
+  }
+
+  ch = state.input.charCodeAt(++state.position);
+
+  if (ch === 0x3C/* < */) {
+    isVerbatim = true;
+    ch = state.input.charCodeAt(++state.position);
+
+  } else if (ch === 0x21/* ! */) {
+    isNamed = true;
+    tagHandle = '!!';
+    ch = state.input.charCodeAt(++state.position);
+
+  } else {
+    tagHandle = '!';
+  }
+
+  _position = state.position;
+
+  if (isVerbatim) {
+    do { ch = state.input.charCodeAt(++state.position); }
+    while (ch !== 0 && ch !== 0x3E/* > */);
+
+    if (state.position < state.length) {
+      tagName = state.input.slice(_position, state.position);
+      ch = state.input.charCodeAt(++state.position);
+    } else {
+      throwError(state, 'unexpected end of the stream within a verbatim tag');
+    }
+  } else {
+    while (ch !== 0 && !is_WS_OR_EOL(ch)) {
+
+      if (ch === 0x21/* ! */) {
+        if (!isNamed) {
+          tagHandle = state.input.slice(_position - 1, state.position + 1);
+
+          if (!PATTERN_TAG_HANDLE.test(tagHandle)) {
+            throwError(state, 'named tag handle cannot contain such characters');
+          }
+
+          isNamed = true;
+          _position = state.position + 1;
+        } else {
+          throwError(state, 'tag suffix cannot contain exclamation marks');
+        }
+      }
+
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    tagName = state.input.slice(_position, state.position);
+
+    if (PATTERN_FLOW_INDICATORS.test(tagName)) {
+      throwError(state, 'tag suffix cannot contain flow indicator characters');
+    }
+  }
+
+  if (tagName && !PATTERN_TAG_URI.test(tagName)) {
+    throwError(state, 'tag name cannot contain such characters: ' + tagName);
+  }
+
+  if (isVerbatim) {
+    state.tag = tagName;
+
+  } else if (_hasOwnProperty.call(state.tagMap, tagHandle)) {
+    state.tag = state.tagMap[tagHandle] + tagName;
+
+  } else if (tagHandle === '!') {
+    state.tag = '!' + tagName;
+
+  } else if (tagHandle === '!!') {
+    state.tag = 'tag:yaml.org,2002:' + tagName;
+
+  } else {
+    throwError(state, 'undeclared tag handle "' + tagHandle + '"');
+  }
+
+  return true;
+}
+
+function readAnchorProperty(state) {
+  var _position,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch !== 0x26/* & */) return false;
+
+  if (state.anchor !== null) {
+    throwError(state, 'duplication of an anchor property');
+  }
+
+  ch = state.input.charCodeAt(++state.position);
+  _position = state.position;
+
+  while (ch !== 0 && !is_WS_OR_EOL(ch) && !is_FLOW_INDICATOR(ch)) {
+    ch = state.input.charCodeAt(++state.position);
+  }
+
+  if (state.position === _position) {
+    throwError(state, 'name of an anchor node must contain at least one character');
+  }
+
+  state.anchor = state.input.slice(_position, state.position);
+  return true;
+}
+
+function readAlias(state) {
+  var _position, alias,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch !== 0x2A/* * */) return false;
+
+  ch = state.input.charCodeAt(++state.position);
+  _position = state.position;
+
+  while (ch !== 0 && !is_WS_OR_EOL(ch) && !is_FLOW_INDICATOR(ch)) {
+    ch = state.input.charCodeAt(++state.position);
+  }
+
+  if (state.position === _position) {
+    throwError(state, 'name of an alias node must contain at least one character');
+  }
+
+  alias = state.input.slice(_position, state.position);
+
+  if (!state.anchorMap.hasOwnProperty(alias)) {
+    throwError(state, 'unidentified alias "' + alias + '"');
+  }
+
+  state.result = state.anchorMap[alias];
+  skipSeparationSpace(state, true, -1);
+  return true;
+}
+
+function composeNode(state, parentIndent, nodeContext, allowToSeek, allowCompact) {
+  var allowBlockStyles,
+      allowBlockScalars,
+      allowBlockCollections,
+      indentStatus = 1, // 1: this>parent, 0: this=parent, -1: this<parent
+      atNewLine  = false,
+      hasContent = false,
+      typeIndex,
+      typeQuantity,
+      type,
+      flowIndent,
+      blockIndent;
+
+  if (state.listener !== null) {
+    state.listener('open', state);
+  }
+
+  state.tag    = null;
+  state.anchor = null;
+  state.kind   = null;
+  state.result = null;
+
+  allowBlockStyles = allowBlockScalars = allowBlockCollections =
+    CONTEXT_BLOCK_OUT === nodeContext ||
+    CONTEXT_BLOCK_IN  === nodeContext;
+
+  if (allowToSeek) {
+    if (skipSeparationSpace(state, true, -1)) {
+      atNewLine = true;
+
+      if (state.lineIndent > parentIndent) {
+        indentStatus = 1;
+      } else if (state.lineIndent === parentIndent) {
+        indentStatus = 0;
+      } else if (state.lineIndent < parentIndent) {
+        indentStatus = -1;
+      }
+    }
+  }
+
+  if (indentStatus === 1) {
+    while (readTagProperty(state) || readAnchorProperty(state)) {
+      if (skipSeparationSpace(state, true, -1)) {
+        atNewLine = true;
+        allowBlockCollections = allowBlockStyles;
+
+        if (state.lineIndent > parentIndent) {
+          indentStatus = 1;
+        } else if (state.lineIndent === parentIndent) {
+          indentStatus = 0;
+        } else if (state.lineIndent < parentIndent) {
+          indentStatus = -1;
+        }
+      } else {
+        allowBlockCollections = false;
+      }
+    }
+  }
+
+  if (allowBlockCollections) {
+    allowBlockCollections = atNewLine || allowCompact;
+  }
+
+  if (indentStatus === 1 || CONTEXT_BLOCK_OUT === nodeContext) {
+    if (CONTEXT_FLOW_IN === nodeContext || CONTEXT_FLOW_OUT === nodeContext) {
+      flowIndent = parentIndent;
+    } else {
+      flowIndent = parentIndent + 1;
+    }
+
+    blockIndent = state.position - state.lineStart;
+
+    if (indentStatus === 1) {
+      if (allowBlockCollections &&
+          (readBlockSequence(state, blockIndent) ||
+           readBlockMapping(state, blockIndent, flowIndent)) ||
+          readFlowCollection(state, flowIndent)) {
+        hasContent = true;
+      } else {
+        if ((allowBlockScalars && readBlockScalar(state, flowIndent)) ||
+            readSingleQuotedScalar(state, flowIndent) ||
+            readDoubleQuotedScalar(state, flowIndent)) {
+          hasContent = true;
+
+        } else if (readAlias(state)) {
+          hasContent = true;
+
+          if (state.tag !== null || state.anchor !== null) {
+            throwError(state, 'alias node should not have any properties');
+          }
+
+        } else if (readPlainScalar(state, flowIndent, CONTEXT_FLOW_IN === nodeContext)) {
+          hasContent = true;
+
+          if (state.tag === null) {
+            state.tag = '?';
+          }
+        }
+
+        if (state.anchor !== null) {
+          state.anchorMap[state.anchor] = state.result;
+        }
+      }
+    } else if (indentStatus === 0) {
+      // Special case: block sequences are allowed to have same indentation level as the parent.
+      // http://www.yaml.org/spec/1.2/spec.html#id2799784
+      hasContent = allowBlockCollections && readBlockSequence(state, blockIndent);
+    }
+  }
+
+  if (state.tag !== null && state.tag !== '!') {
+    if (state.tag === '?') {
+      for (typeIndex = 0, typeQuantity = state.implicitTypes.length;
+           typeIndex < typeQuantity;
+           typeIndex += 1) {
+        type = state.implicitTypes[typeIndex];
+
+        // Implicit resolving is not allowed for non-scalar types, and '?'
+        // non-specific tag is only assigned to plain scalars. So, it isn't
+        // needed to check for 'kind' conformity.
+
+        if (type.resolve(state.result)) { // `state.result` updated in resolver if matched
+          state.result = type.construct(state.result);
+          state.tag = type.tag;
+          if (state.anchor !== null) {
+            state.anchorMap[state.anchor] = state.result;
+          }
+          break;
+        }
+      }
+    } else if (_hasOwnProperty.call(state.typeMap[state.kind || 'fallback'], state.tag)) {
+      type = state.typeMap[state.kind || 'fallback'][state.tag];
+
+      if (state.result !== null && type.kind !== state.kind) {
+        throwError(state, 'unacceptable node kind for !<' + state.tag + '> tag; it should be "' + type.kind + '", not "' + state.kind + '"');
+      }
+
+      if (!type.resolve(state.result)) { // `state.result` updated in resolver if matched
+        throwError(state, 'cannot resolve a node with !<' + state.tag + '> explicit tag');
+      } else {
+        state.result = type.construct(state.result);
+        if (state.anchor !== null) {
+          state.anchorMap[state.anchor] = state.result;
+        }
+      }
+    } else {
+      throwError(state, 'unknown tag !<' + state.tag + '>');
+    }
+  }
+
+  if (state.listener !== null) {
+    state.listener('close', state);
+  }
+  return state.tag !== null ||  state.anchor !== null || hasContent;
+}
+
+function readDocument(state) {
+  var documentStart = state.position,
+      _position,
+      directiveName,
+      directiveArgs,
+      hasDirectives = false,
+      ch;
+
+  state.version = null;
+  state.checkLineBreaks = state.legacy;
+  state.tagMap = {};
+  state.anchorMap = {};
+
+  while ((ch = state.input.charCodeAt(state.position)) !== 0) {
+    skipSeparationSpace(state, true, -1);
+
+    ch = state.input.charCodeAt(state.position);
+
+    if (state.lineIndent > 0 || ch !== 0x25/* % */) {
+      break;
+    }
+
+    hasDirectives = true;
+    ch = state.input.charCodeAt(++state.position);
+    _position = state.position;
+
+    while (ch !== 0 && !is_WS_OR_EOL(ch)) {
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    directiveName = state.input.slice(_position, state.position);
+    directiveArgs = [];
+
+    if (directiveName.length < 1) {
+      throwError(state, 'directive name must not be less than one character in length');
+    }
+
+    while (ch !== 0) {
+      while (is_WHITE_SPACE(ch)) {
+        ch = state.input.charCodeAt(++state.position);
+      }
+
+      if (ch === 0x23/* # */) {
+        do { ch = state.input.charCodeAt(++state.position); }
+        while (ch !== 0 && !is_EOL(ch));
+        break;
+      }
+
+      if (is_EOL(ch)) break;
+
+      _position = state.position;
+
+      while (ch !== 0 && !is_WS_OR_EOL(ch)) {
+        ch = state.input.charCodeAt(++state.position);
+      }
+
+      directiveArgs.push(state.input.slice(_position, state.position));
+    }
+
+    if (ch !== 0) readLineBreak(state);
+
+    if (_hasOwnProperty.call(directiveHandlers, directiveName)) {
+      directiveHandlers[directiveName](state, directiveName, directiveArgs);
+    } else {
+      throwWarning(state, 'unknown document directive "' + directiveName + '"');
+    }
+  }
+
+  skipSeparationSpace(state, true, -1);
+
+  if (state.lineIndent === 0 &&
+      state.input.charCodeAt(state.position)     === 0x2D/* - */ &&
+      state.input.charCodeAt(state.position + 1) === 0x2D/* - */ &&
+      state.input.charCodeAt(state.position + 2) === 0x2D/* - */) {
+    state.position += 3;
+    skipSeparationSpace(state, true, -1);
+
+  } else if (hasDirectives) {
+    throwError(state, 'directives end mark is expected');
+  }
+
+  composeNode(state, state.lineIndent - 1, CONTEXT_BLOCK_OUT, false, true);
+  skipSeparationSpace(state, true, -1);
+
+  if (state.checkLineBreaks &&
+      PATTERN_NON_ASCII_LINE_BREAKS.test(state.input.slice(documentStart, state.position))) {
+    throwWarning(state, 'non-ASCII line breaks are interpreted as content');
+  }
+
+  state.documents.push(state.result);
+
+  if (state.position === state.lineStart && testDocumentSeparator(state)) {
+
+    if (state.input.charCodeAt(state.position) === 0x2E/* . */) {
+      state.position += 3;
+      skipSeparationSpace(state, true, -1);
+    }
+    return;
+  }
+
+  if (state.position < (state.length - 1)) {
+    throwError(state, 'end of the stream or a document separator is expected');
+  } else {
+    return;
+  }
+}
+
+
+function loadDocuments(input, options) {
+  input = String(input);
+  options = options || {};
+
+  if (input.length !== 0) {
+
+    // Add tailing `\n` if not exists
+    if (input.charCodeAt(input.length - 1) !== 0x0A/* LF */ &&
+        input.charCodeAt(input.length - 1) !== 0x0D/* CR */) {
+      input += '\n';
+    }
+
+    // Strip BOM
+    if (input.charCodeAt(0) === 0xFEFF) {
+      input = input.slice(1);
+    }
+  }
+
+  var state = new State(input, options);
+
+  // Use 0 as string terminator. That significantly simplifies bounds check.
+  state.input += '\0';
+
+  while (state.input.charCodeAt(state.position) === 0x20/* Space */) {
+    state.lineIndent += 1;
+    state.position += 1;
+  }
+
+  while (state.position < (state.length - 1)) {
+    readDocument(state);
+  }
+
+  return state.documents;
+}
+
+
+function loadAll(input, iterator, options) {
+  var documents = loadDocuments(input, options), index, length;
+
+  for (index = 0, length = documents.length; index < length; index += 1) {
+    iterator(documents[index]);
+  }
+}
+
+
+function load(input, options) {
+  var documents = loadDocuments(input, options);
+
+  if (documents.length === 0) {
+    /*eslint-disable no-undefined*/
+    return undefined;
+  } else if (documents.length === 1) {
+    return documents[0];
+  }
+  throw new YAMLException('expected a single document in the stream, but found more');
+}
+
+
+function safeLoadAll(input, output, options) {
+  loadAll(input, output, common.extend({ schema: DEFAULT_SAFE_SCHEMA }, options));
+}
+
+
+function safeLoad(input, options) {
+  return load(input, common.extend({ schema: DEFAULT_SAFE_SCHEMA }, options));
+}
+
+
+module.exports.loadAll     = loadAll;
+module.exports.load        = load;
+module.exports.safeLoadAll = safeLoadAll;
+module.exports.safeLoad    = safeLoad;
+
+},{"./common":2,"./exception":4,"./mark":6,"./schema/default_full":9,"./schema/default_safe":10}],6:[function(require,module,exports){
+'use strict';
+
+
+var common = require('./common');
+
+
+function Mark(name, buffer, position, line, column) {
+  this.name     = name;
+  this.buffer   = buffer;
+  this.position = position;
+  this.line     = line;
+  this.column   = column;
+}
+
+
+Mark.prototype.getSnippet = function getSnippet(indent, maxLength) {
+  var head, start, tail, end, snippet;
+
+  if (!this.buffer) return null;
+
+  indent = indent || 4;
+  maxLength = maxLength || 75;
+
+  head = '';
+  start = this.position;
+
+  while (start > 0 && '\x00\r\n\x85\u2028\u2029'.indexOf(this.buffer.charAt(start - 1)) === -1) {
+    start -= 1;
+    if (this.position - start > (maxLength / 2 - 1)) {
+      head = ' ... ';
+      start += 5;
+      break;
+    }
+  }
+
+  tail = '';
+  end = this.position;
+
+  while (end < this.buffer.length && '\x00\r\n\x85\u2028\u2029'.indexOf(this.buffer.charAt(end)) === -1) {
+    end += 1;
+    if (end - this.position > (maxLength / 2 - 1)) {
+      tail = ' ... ';
+      end -= 5;
+      break;
+    }
+  }
+
+  snippet = this.buffer.slice(start, end);
+
+  return common.repeat(' ', indent) + head + snippet + tail + '\n' +
+         common.repeat(' ', indent + this.position - start + head.length) + '^';
+};
+
+
+Mark.prototype.toString = function toString(compact) {
+  var snippet, where = '';
+
+  if (this.name) {
+    where += 'in "' + this.name + '" ';
+  }
+
+  where += 'at line ' + (this.line + 1) + ', column ' + (this.column + 1);
+
+  if (!compact) {
+    snippet = this.getSnippet();
+
+    if (snippet) {
+      where += ':\n' + snippet;
+    }
+  }
+
+  return where;
+};
+
+
+module.exports = Mark;
+
+},{"./common":2}],7:[function(require,module,exports){
+'use strict';
+
+/*eslint-disable max-len*/
+
+var common        = require('./common');
+var YAMLException = require('./exception');
+var Type          = require('./type');
+
+
+function compileList(schema, name, result) {
+  var exclude = [];
+
+  schema.include.forEach(function (includedSchema) {
+    result = compileList(includedSchema, name, result);
+  });
+
+  schema[name].forEach(function (currentType) {
+    result.forEach(function (previousType, previousIndex) {
+      if (previousType.tag === currentType.tag && previousType.kind === currentType.kind) {
+        exclude.push(previousIndex);
+      }
+    });
+
+    result.push(currentType);
+  });
+
+  return result.filter(function (type, index) {
+    return exclude.indexOf(index) === -1;
+  });
+}
+
+
+function compileMap(/* lists... */) {
+  var result = {
+        scalar: {},
+        sequence: {},
+        mapping: {},
+        fallback: {}
+      }, index, length;
+
+  function collectType(type) {
+    result[type.kind][type.tag] = result['fallback'][type.tag] = type;
+  }
+
+  for (index = 0, length = arguments.length; index < length; index += 1) {
+    arguments[index].forEach(collectType);
+  }
+  return result;
+}
+
+
+function Schema(definition) {
+  this.include  = definition.include  || [];
+  this.implicit = definition.implicit || [];
+  this.explicit = definition.explicit || [];
+
+  this.implicit.forEach(function (type) {
+    if (type.loadKind && type.loadKind !== 'scalar') {
+      throw new YAMLException('There is a non-scalar type in the implicit list of a schema. Implicit resolving of such types is not supported.');
+    }
+  });
+
+  this.compiledImplicit = compileList(this, 'implicit', []);
+  this.compiledExplicit = compileList(this, 'explicit', []);
+  this.compiledTypeMap  = compileMap(this.compiledImplicit, this.compiledExplicit);
+}
+
+
+Schema.DEFAULT = null;
+
+
+Schema.create = function createSchema() {
+  var schemas, types;
+
+  switch (arguments.length) {
+    case 1:
+      schemas = Schema.DEFAULT;
+      types = arguments[0];
+      break;
+
+    case 2:
+      schemas = arguments[0];
+      types = arguments[1];
+      break;
+
+    default:
+      throw new YAMLException('Wrong number of arguments for Schema.create function');
+  }
+
+  schemas = common.toArray(schemas);
+  types = common.toArray(types);
+
+  if (!schemas.every(function (schema) { return schema instanceof Schema; })) {
+    throw new YAMLException('Specified list of super schemas (or a single Schema object) contains a non-Schema object.');
+  }
+
+  if (!types.every(function (type) { return type instanceof Type; })) {
+    throw new YAMLException('Specified list of YAML types (or a single Type object) contains a non-Type object.');
+  }
+
+  return new Schema({
+    include: schemas,
+    explicit: types
+  });
+};
+
+
+module.exports = Schema;
+
+},{"./common":2,"./exception":4,"./type":13}],8:[function(require,module,exports){
+// Standard YAML's Core schema.
+// http://www.yaml.org/spec/1.2/spec.html#id2804923
+//
+// NOTE: JS-YAML does not support schema-specific tag resolution restrictions.
+// So, Core schema has no distinctions from JSON schema is JS-YAML.
+
+
+'use strict';
+
+
+var Schema = require('../schema');
+
+
+module.exports = new Schema({
+  include: [
+    require('./json')
+  ]
+});
+
+},{"../schema":7,"./json":12}],9:[function(require,module,exports){
+// JS-YAML's default schema for `load` function.
+// It is not described in the YAML specification.
+//
+// This schema is based on JS-YAML's default safe schema and includes
+// JavaScript-specific types: !!js/undefined, !!js/regexp and !!js/function.
+//
+// Also this schema is used as default base schema at `Schema.create` function.
+
+
+'use strict';
+
+
+var Schema = require('../schema');
+
+
+module.exports = Schema.DEFAULT = new Schema({
+  include: [
+    require('./default_safe')
+  ],
+  explicit: [
+    require('../type/js/undefined'),
+    require('../type/js/regexp'),
+    require('../type/js/function')
+  ]
+});
+
+},{"../schema":7,"../type/js/function":18,"../type/js/regexp":19,"../type/js/undefined":20,"./default_safe":10}],10:[function(require,module,exports){
+// JS-YAML's default schema for `safeLoad` function.
+// It is not described in the YAML specification.
+//
+// This schema is based on standard YAML's Core schema and includes most of
+// extra types described at YAML tag repository. (http://yaml.org/type/)
+
+
+'use strict';
+
+
+var Schema = require('../schema');
+
+
+module.exports = new Schema({
+  include: [
+    require('./core')
+  ],
+  implicit: [
+    require('../type/timestamp'),
+    require('../type/merge')
+  ],
+  explicit: [
+    require('../type/binary'),
+    require('../type/omap'),
+    require('../type/pairs'),
+    require('../type/set')
+  ]
+});
+
+},{"../schema":7,"../type/binary":14,"../type/merge":22,"../type/omap":24,"../type/pairs":25,"../type/set":27,"../type/timestamp":29,"./core":8}],11:[function(require,module,exports){
+// Standard YAML's Failsafe schema.
+// http://www.yaml.org/spec/1.2/spec.html#id2802346
+
+
+'use strict';
+
+
+var Schema = require('../schema');
+
+
+module.exports = new Schema({
+  explicit: [
+    require('../type/str'),
+    require('../type/seq'),
+    require('../type/map')
+  ]
+});
+
+},{"../schema":7,"../type/map":21,"../type/seq":26,"../type/str":28}],12:[function(require,module,exports){
+// Standard YAML's JSON schema.
+// http://www.yaml.org/spec/1.2/spec.html#id2803231
+//
+// NOTE: JS-YAML does not support schema-specific tag resolution restrictions.
+// So, this schema is not such strict as defined in the YAML specification.
+// It allows numbers in binary notaion, use `Null` and `NULL` as `null`, etc.
+
+
+'use strict';
+
+
+var Schema = require('../schema');
+
+
+module.exports = new Schema({
+  include: [
+    require('./failsafe')
+  ],
+  implicit: [
+    require('../type/null'),
+    require('../type/bool'),
+    require('../type/int'),
+    require('../type/float')
+  ]
+});
+
+},{"../schema":7,"../type/bool":15,"../type/float":16,"../type/int":17,"../type/null":23,"./failsafe":11}],13:[function(require,module,exports){
+'use strict';
+
+var YAMLException = require('./exception');
+
+var TYPE_CONSTRUCTOR_OPTIONS = [
+  'kind',
+  'resolve',
+  'construct',
+  'instanceOf',
+  'predicate',
+  'represent',
+  'defaultStyle',
+  'styleAliases'
+];
+
+var YAML_NODE_KINDS = [
+  'scalar',
+  'sequence',
+  'mapping'
+];
+
+function compileStyleAliases(map) {
+  var result = {};
+
+  if (map !== null) {
+    Object.keys(map).forEach(function (style) {
+      map[style].forEach(function (alias) {
+        result[String(alias)] = style;
+      });
+    });
+  }
+
+  return result;
+}
+
+function Type(tag, options) {
+  options = options || {};
+
+  Object.keys(options).forEach(function (name) {
+    if (TYPE_CONSTRUCTOR_OPTIONS.indexOf(name) === -1) {
+      throw new YAMLException('Unknown option "' + name + '" is met in definition of "' + tag + '" YAML type.');
+    }
+  });
+
+  // TODO: Add tag format check.
+  this.tag          = tag;
+  this.kind         = options['kind']         || null;
+  this.resolve      = options['resolve']      || function () { return true; };
+  this.construct    = options['construct']    || function (data) { return data; };
+  this.instanceOf   = options['instanceOf']   || null;
+  this.predicate    = options['predicate']    || null;
+  this.represent    = options['represent']    || null;
+  this.defaultStyle = options['defaultStyle'] || null;
+  this.styleAliases = compileStyleAliases(options['styleAliases'] || null);
+
+  if (YAML_NODE_KINDS.indexOf(this.kind) === -1) {
+    throw new YAMLException('Unknown kind "' + this.kind + '" is specified for "' + tag + '" YAML type.');
+  }
+}
+
+module.exports = Type;
+
+},{"./exception":4}],14:[function(require,module,exports){
+'use strict';
+
+/*eslint-disable no-bitwise*/
+
+var NodeBuffer;
+
+try {
+  // A trick for browserified version, to not include `Buffer` shim
+  var _require = require;
+  NodeBuffer = _require('buffer').Buffer;
+} catch (__) {}
+
+var Type       = require('../type');
+
+
+// [ 64, 65, 66 ] -> [ padding, CR, LF ]
+var BASE64_MAP = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n\r';
+
+
+function resolveYamlBinary(data) {
+  if (data === null) return false;
+
+  var code, idx, bitlen = 0, max = data.length, map = BASE64_MAP;
+
+  // Convert one by one.
+  for (idx = 0; idx < max; idx++) {
+    code = map.indexOf(data.charAt(idx));
+
+    // Skip CR/LF
+    if (code > 64) continue;
+
+    // Fail on illegal characters
+    if (code < 0) return false;
+
+    bitlen += 6;
+  }
+
+  // If there are any bits left, source was corrupted
+  return (bitlen % 8) === 0;
+}
+
+function constructYamlBinary(data) {
+  var idx, tailbits,
+      input = data.replace(/[\r\n=]/g, ''), // remove CR/LF & padding to simplify scan
+      max = input.length,
+      map = BASE64_MAP,
+      bits = 0,
+      result = [];
+
+  // Collect by 6*4 bits (3 bytes)
+
+  for (idx = 0; idx < max; idx++) {
+    if ((idx % 4 === 0) && idx) {
+      result.push((bits >> 16) & 0xFF);
+      result.push((bits >> 8) & 0xFF);
+      result.push(bits & 0xFF);
+    }
+
+    bits = (bits << 6) | map.indexOf(input.charAt(idx));
+  }
+
+  // Dump tail
+
+  tailbits = (max % 4) * 6;
+
+  if (tailbits === 0) {
+    result.push((bits >> 16) & 0xFF);
+    result.push((bits >> 8) & 0xFF);
+    result.push(bits & 0xFF);
+  } else if (tailbits === 18) {
+    result.push((bits >> 10) & 0xFF);
+    result.push((bits >> 2) & 0xFF);
+  } else if (tailbits === 12) {
+    result.push((bits >> 4) & 0xFF);
+  }
+
+  // Wrap into Buffer for NodeJS and leave Array for browser
+  if (NodeBuffer) return new NodeBuffer(result);
+
+  return result;
+}
+
+function representYamlBinary(object /*, style*/) {
+  var result = '', bits = 0, idx, tail,
+      max = object.length,
+      map = BASE64_MAP;
+
+  // Convert every three bytes to 4 ASCII characters.
+
+  for (idx = 0; idx < max; idx++) {
+    if ((idx % 3 === 0) && idx) {
+      result += map[(bits >> 18) & 0x3F];
+      result += map[(bits >> 12) & 0x3F];
+      result += map[(bits >> 6) & 0x3F];
+      result += map[bits & 0x3F];
+    }
+
+    bits = (bits << 8) + object[idx];
+  }
+
+  // Dump tail
+
+  tail = max % 3;
+
+  if (tail === 0) {
+    result += map[(bits >> 18) & 0x3F];
+    result += map[(bits >> 12) & 0x3F];
+    result += map[(bits >> 6) & 0x3F];
+    result += map[bits & 0x3F];
+  } else if (tail === 2) {
+    result += map[(bits >> 10) & 0x3F];
+    result += map[(bits >> 4) & 0x3F];
+    result += map[(bits << 2) & 0x3F];
+    result += map[64];
+  } else if (tail === 1) {
+    result += map[(bits >> 2) & 0x3F];
+    result += map[(bits << 4) & 0x3F];
+    result += map[64];
+    result += map[64];
+  }
+
+  return result;
+}
+
+function isBinary(object) {
+  return NodeBuffer && NodeBuffer.isBuffer(object);
+}
+
+module.exports = new Type('tag:yaml.org,2002:binary', {
+  kind: 'scalar',
+  resolve: resolveYamlBinary,
+  construct: constructYamlBinary,
+  predicate: isBinary,
+  represent: representYamlBinary
+});
+
+},{"../type":13}],15:[function(require,module,exports){
+'use strict';
+
+var Type = require('../type');
+
+function resolveYamlBoolean(data) {
+  if (data === null) return false;
+
+  var max = data.length;
+
+  return (max === 4 && (data === 'true' || data === 'True' || data === 'TRUE')) ||
+         (max === 5 && (data === 'false' || data === 'False' || data === 'FALSE'));
+}
+
+function constructYamlBoolean(data) {
+  return data === 'true' ||
+         data === 'True' ||
+         data === 'TRUE';
+}
+
+function isBoolean(object) {
+  return Object.prototype.toString.call(object) === '[object Boolean]';
+}
+
+module.exports = new Type('tag:yaml.org,2002:bool', {
+  kind: 'scalar',
+  resolve: resolveYamlBoolean,
+  construct: constructYamlBoolean,
+  predicate: isBoolean,
+  represent: {
+    lowercase: function (object) { return object ? 'true' : 'false'; },
+    uppercase: function (object) { return object ? 'TRUE' : 'FALSE'; },
+    camelcase: function (object) { return object ? 'True' : 'False'; }
+  },
+  defaultStyle: 'lowercase'
+});
+
+},{"../type":13}],16:[function(require,module,exports){
+'use strict';
+
+var common = require('../common');
+var Type   = require('../type');
+
+var YAML_FLOAT_PATTERN = new RegExp(
+  '^(?:[-+]?(?:[0-9][0-9_]*)\\.[0-9_]*(?:[eE][-+][0-9]+)?' +
+  '|\\.[0-9_]+(?:[eE][-+][0-9]+)?' +
+  '|[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+\\.[0-9_]*' +
+  '|[-+]?\\.(?:inf|Inf|INF)' +
+  '|\\.(?:nan|NaN|NAN))$');
+
+function resolveYamlFloat(data) {
+  if (data === null) return false;
+
+  if (!YAML_FLOAT_PATTERN.test(data)) return false;
+
+  return true;
+}
+
+function constructYamlFloat(data) {
+  var value, sign, base, digits;
+
+  value  = data.replace(/_/g, '').toLowerCase();
+  sign   = value[0] === '-' ? -1 : 1;
+  digits = [];
+
+  if ('+-'.indexOf(value[0]) >= 0) {
+    value = value.slice(1);
+  }
+
+  if (value === '.inf') {
+    return (sign === 1) ? Number.POSITIVE_INFINITY : Number.NEGATIVE_INFINITY;
+
+  } else if (value === '.nan') {
+    return NaN;
+
+  } else if (value.indexOf(':') >= 0) {
+    value.split(':').forEach(function (v) {
+      digits.unshift(parseFloat(v, 10));
+    });
+
+    value = 0.0;
+    base = 1;
+
+    digits.forEach(function (d) {
+      value += d * base;
+      base *= 60;
+    });
+
+    return sign * value;
+
+  }
+  return sign * parseFloat(value, 10);
+}
+
+
+var SCIENTIFIC_WITHOUT_DOT = /^[-+]?[0-9]+e/;
+
+function representYamlFloat(object, style) {
+  var res;
+
+  if (isNaN(object)) {
+    switch (style) {
+      case 'lowercase': return '.nan';
+      case 'uppercase': return '.NAN';
+      case 'camelcase': return '.NaN';
+    }
+  } else if (Number.POSITIVE_INFINITY === object) {
+    switch (style) {
+      case 'lowercase': return '.inf';
+      case 'uppercase': return '.INF';
+      case 'camelcase': return '.Inf';
+    }
+  } else if (Number.NEGATIVE_INFINITY === object) {
+    switch (style) {
+      case 'lowercase': return '-.inf';
+      case 'uppercase': return '-.INF';
+      case 'camelcase': return '-.Inf';
+    }
+  } else if (common.isNegativeZero(object)) {
+    return '-0.0';
+  }
+
+  res = object.toString(10);
+
+  // JS stringifier can build scientific format without dots: 5e-100,
+  // while YAML requres dot: 5.e-100. Fix it with simple hack
+
+  return SCIENTIFIC_WITHOUT_DOT.test(res) ? res.replace('e', '.e') : res;
+}
+
+function isFloat(object) {
+  return (Object.prototype.toString.call(object) === '[object Number]') &&
+         (object % 1 !== 0 || common.isNegativeZero(object));
+}
+
+module.exports = new Type('tag:yaml.org,2002:float', {
+  kind: 'scalar',
+  resolve: resolveYamlFloat,
+  construct: constructYamlFloat,
+  predicate: isFloat,
+  represent: representYamlFloat,
+  defaultStyle: 'lowercase'
+});
+
+},{"../common":2,"../type":13}],17:[function(require,module,exports){
+'use strict';
+
+var common = require('../common');
+var Type   = require('../type');
+
+function isHexCode(c) {
+  return ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */)) ||
+         ((0x41/* A */ <= c) && (c <= 0x46/* F */)) ||
+         ((0x61/* a */ <= c) && (c <= 0x66/* f */));
+}
+
+function isOctCode(c) {
+  return ((0x30/* 0 */ <= c) && (c <= 0x37/* 7 */));
+}
+
+function isDecCode(c) {
+  return ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */));
+}
+
+function resolveYamlInteger(data) {
+  if (data === null) return false;
+
+  var max = data.length,
+      index = 0,
+      hasDigits = false,
+      ch;
+
+  if (!max) return false;
+
+  ch = data[index];
+
+  // sign
+  if (ch === '-' || ch === '+') {
+    ch = data[++index];
+  }
+
+  if (ch === '0') {
+    // 0
+    if (index + 1 === max) return true;
+    ch = data[++index];
+
+    // base 2, base 8, base 16
+
+    if (ch === 'b') {
+      // base 2
+      index++;
+
+      for (; index < max; index++) {
+        ch = data[index];
+        if (ch === '_') continue;
+        if (ch !== '0' && ch !== '1') return false;
+        hasDigits = true;
+      }
+      return hasDigits;
+    }
+
+
+    if (ch === 'x') {
+      // base 16
+      index++;
+
+      for (; index < max; index++) {
+        ch = data[index];
+        if (ch === '_') continue;
+        if (!isHexCode(data.charCodeAt(index))) return false;
+        hasDigits = true;
+      }
+      return hasDigits;
+    }
+
+    // base 8
+    for (; index < max; index++) {
+      ch = data[index];
+      if (ch === '_') continue;
+      if (!isOctCode(data.charCodeAt(index))) return false;
+      hasDigits = true;
+    }
+    return hasDigits;
+  }
+
+  // base 10 (except 0) or base 60
+
+  for (; index < max; index++) {
+    ch = data[index];
+    if (ch === '_') continue;
+    if (ch === ':') break;
+    if (!isDecCode(data.charCodeAt(index))) {
+      return false;
+    }
+    hasDigits = true;
+  }
+
+  if (!hasDigits) return false;
+
+  // if !base60 - done;
+  if (ch !== ':') return true;
+
+  // base60 almost not used, no needs to optimize
+  return /^(:[0-5]?[0-9])+$/.test(data.slice(index));
+}
+
+function constructYamlInteger(data) {
+  var value = data, sign = 1, ch, base, digits = [];
+
+  if (value.indexOf('_') !== -1) {
+    value = value.replace(/_/g, '');
+  }
+
+  ch = value[0];
+
+  if (ch === '-' || ch === '+') {
+    if (ch === '-') sign = -1;
+    value = value.slice(1);
+    ch = value[0];
+  }
+
+  if (value === '0') return 0;
+
+  if (ch === '0') {
+    if (value[1] === 'b') return sign * parseInt(value.slice(2), 2);
+    if (value[1] === 'x') return sign * parseInt(value, 16);
+    return sign * parseInt(value, 8);
+  }
+
+  if (value.indexOf(':') !== -1) {
+    value.split(':').forEach(function (v) {
+      digits.unshift(parseInt(v, 10));
+    });
+
+    value = 0;
+    base = 1;
+
+    digits.forEach(function (d) {
+      value += (d * base);
+      base *= 60;
+    });
+
+    return sign * value;
+
+  }
+
+  return sign * parseInt(value, 10);
+}
+
+function isInteger(object) {
+  return (Object.prototype.toString.call(object)) === '[object Number]' &&
+         (object % 1 === 0 && !common.isNegativeZero(object));
+}
+
+module.exports = new Type('tag:yaml.org,2002:int', {
+  kind: 'scalar',
+  resolve: resolveYamlInteger,
+  construct: constructYamlInteger,
+  predicate: isInteger,
+  represent: {
+    binary:      function (object) { return '0b' + object.toString(2); },
+    octal:       function (object) { return '0'  + object.toString(8); },
+    decimal:     function (object) { return        object.toString(10); },
+    hexadecimal: function (object) { return '0x' + object.toString(16).toUpperCase(); }
+  },
+  defaultStyle: 'decimal',
+  styleAliases: {
+    binary:      [ 2,  'bin' ],
+    octal:       [ 8,  'oct' ],
+    decimal:     [ 10, 'dec' ],
+    hexadecimal: [ 16, 'hex' ]
+  }
+});
+
+},{"../common":2,"../type":13}],18:[function(require,module,exports){
+'use strict';
+
+var esprima;
+
+// Browserified version does not have esprima
+//
+// 1. For node.js just require module as deps
+// 2. For browser try to require mudule via external AMD system.
+//    If not found - try to fallback to window.esprima. If not
+//    found too - then fail to parse.
+//
+try {
+  // workaround to exclude package from browserify list.
+  var _require = require;
+  esprima = _require('esprima');
+} catch (_) {
+  /*global window */
+  if (typeof window !== 'undefined') esprima = window.esprima;
+}
+
+var Type = require('../../type');
+
+function resolveJavascriptFunction(data) {
+  if (data === null) return false;
+
+  try {
+    var source = '(' + data + ')',
+        ast    = esprima.parse(source, { range: true });
+
+    if (ast.type                    !== 'Program'             ||
+        ast.body.length             !== 1                     ||
+        ast.body[0].type            !== 'ExpressionStatement' ||
+        ast.body[0].expression.type !== 'FunctionExpression') {
+      return false;
+    }
+
+    return true;
+  } catch (err) {
+    return false;
+  }
+}
+
+function constructJavascriptFunction(data) {
+  /*jslint evil:true*/
+
+  var source = '(' + data + ')',
+      ast    = esprima.parse(source, { range: true }),
+      params = [],
+      body;
+
+  if (ast.type                    !== 'Program'             ||
+      ast.body.length             !== 1                     ||
+      ast.body[0].type            !== 'ExpressionStatement' ||
+      ast.body[0].expression.type !== 'FunctionExpression') {
+    throw new Error('Failed to resolve function');
+  }
+
+  ast.body[0].expression.params.forEach(function (param) {
+    params.push(param.name);
+  });
+
+  body = ast.body[0].expression.body.range;
+
+  // Esprima's ranges include the first '{' and the last '}' characters on
+  // function expressions. So cut them out.
+  /*eslint-disable no-new-func*/
+  return new Function(params, source.slice(body[0] + 1, body[1] - 1));
+}
+
+function representJavascriptFunction(object /*, style*/) {
+  return object.toString();
+}
+
+function isFunction(object) {
+  return Object.prototype.toString.call(object) === '[object Function]';
+}
+
+module.exports = new Type('tag:yaml.org,2002:js/function', {
+  kind: 'scalar',
+  resolve: resolveJavascriptFunction,
+  construct: constructJavascriptFunction,
+  predicate: isFunction,
+  represent: representJavascriptFunction
+});
+
+},{"../../type":13}],19:[function(require,module,exports){
+'use strict';
+
+var Type = require('../../type');
+
+function resolveJavascriptRegExp(data) {
+  if (data === null) return false;
+  if (data.length === 0) return false;
+
+  var regexp = data,
+      tail   = /\/([gim]*)$/.exec(data),
+      modifiers = '';
+
+  // if regexp starts with '/' it can have modifiers and must be properly closed
+  // `/foo/gim` - modifiers tail can be maximum 3 chars
+  if (regexp[0] === '/') {
+    if (tail) modifiers = tail[1];
+
+    if (modifiers.length > 3) return false;
+    // if expression starts with /, is should be properly terminated
+    if (regexp[regexp.length - modifiers.length - 1] !== '/') return false;
+  }
+
+  return true;
+}
+
+function constructJavascriptRegExp(data) {
+  var regexp = data,
+      tail   = /\/([gim]*)$/.exec(data),
+      modifiers = '';
+
+  // `/foo/gim` - tail can be maximum 4 chars
+  if (regexp[0] === '/') {
+    if (tail) modifiers = tail[1];
+    regexp = regexp.slice(1, regexp.length - modifiers.length - 1);
+  }
+
+  return new RegExp(regexp, modifiers);
+}
+
+function representJavascriptRegExp(object /*, style*/) {
+  var result = '/' + object.source + '/';
+
+  if (object.global) result += 'g';
+  if (object.multiline) result += 'm';
+  if (object.ignoreCase) result += 'i';
+
+  return result;
+}
+
+function isRegExp(object) {
+  return Object.prototype.toString.call(object) === '[object RegExp]';
+}
+
+module.exports = new Type('tag:yaml.org,2002:js/regexp', {
+  kind: 'scalar',
+  resolve: resolveJavascriptRegExp,
+  construct: constructJavascriptRegExp,
+  predicate: isRegExp,
+  represent: representJavascriptRegExp
+});
+
+},{"../../type":13}],20:[function(require,module,exports){
+'use strict';
+
+var Type = require('../../type');
+
+function resolveJavascriptUndefined() {
+  return true;
+}
+
+function constructJavascriptUndefined() {
+  /*eslint-disable no-undefined*/
+  return undefined;
+}
+
+function representJavascriptUndefined() {
+  return '';
+}
+
+function isUndefined(object) {
+  return typeof object === 'undefined';
+}
+
+module.exports = new Type('tag:yaml.org,2002:js/undefined', {
+  kind: 'scalar',
+  resolve: resolveJavascriptUndefined,
+  construct: constructJavascriptUndefined,
+  predicate: isUndefined,
+  represent: representJavascriptUndefined
+});
+
+},{"../../type":13}],21:[function(require,module,exports){
+'use strict';
+
+var Type = require('../type');
+
+module.exports = new Type('tag:yaml.org,2002:map', {
+  kind: 'mapping',
+  construct: function (data) { return data !== null ? data : {}; }
+});
+
+},{"../type":13}],22:[function(require,module,exports){
+'use strict';
+
+var Type = require('../type');
+
+function resolveYamlMerge(data) {
+  return data === '<<' || data === null;
+}
+
+module.exports = new Type('tag:yaml.org,2002:merge', {
+  kind: 'scalar',
+  resolve: resolveYamlMerge
+});
+
+},{"../type":13}],23:[function(require,module,exports){
+'use strict';
+
+var Type = require('../type');
+
+function resolveYamlNull(data) {
+  if (data === null) return true;
+
+  var max = data.length;
+
+  return (max === 1 && data === '~') ||
+         (max === 4 && (data === 'null' || data === 'Null' || data === 'NULL'));
+}
+
+function constructYamlNull() {
+  return null;
+}
+
+function isNull(object) {
+  return object === null;
+}
+
+module.exports = new Type('tag:yaml.org,2002:null', {
+  kind: 'scalar',
+  resolve: resolveYamlNull,
+  construct: constructYamlNull,
+  predicate: isNull,
+  represent: {
+    canonical: function () { return '~';    },
+    lowercase: function () { return 'null'; },
+    uppercase: function () { return 'NULL'; },
+    camelcase: function () { return 'Null'; }
+  },
+  defaultStyle: 'lowercase'
+});
+
+},{"../type":13}],24:[function(require,module,exports){
+'use strict';
+
+var Type = require('../type');
+
+var _hasOwnProperty = Object.prototype.hasOwnProperty;
+var _toString       = Object.prototype.toString;
+
+function resolveYamlOmap(data) {
+  if (data === null) return true;
+
+  var objectKeys = [], index, length, pair, pairKey, pairHasKey,
+      object = data;
+
+  for (index = 0, length = object.length; index < length; index += 1) {
+    pair = object[index];
+    pairHasKey = false;
+
+    if (_toString.call(pair) !== '[object Object]') return false;
+
+    for (pairKey in pair) {
+      if (_hasOwnProperty.call(pair, pairKey)) {
+        if (!pairHasKey) pairHasKey = true;
+        else return false;
+      }
+    }
+
+    if (!pairHasKey) return false;
+
+    if (objectKeys.indexOf(pairKey) === -1) objectKeys.push(pairKey);
+    else return false;
+  }
+
+  return true;
+}
+
+function constructYamlOmap(data) {
+  return data !== null ? data : [];
+}
+
+module.exports = new Type('tag:yaml.org,2002:omap', {
+  kind: 'sequence',
+  resolve: resolveYamlOmap,
+  construct: constructYamlOmap
+});
+
+},{"../type":13}],25:[function(require,module,exports){
+'use strict';
+
+var Type = require('../type');
+
+var _toString = Object.prototype.toString;
+
+function resolveYamlPairs(data) {
+  if (data === null) return true;
+
+  var index, length, pair, keys, result,
+      object = data;
+
+  result = new Array(object.length);
+
+  for (index = 0, length = object.length; index < length; index += 1) {
+    pair = object[index];
+
+    if (_toString.call(pair) !== '[object Object]') return false;
+
+    keys = Object.keys(pair);
+
+    if (keys.length !== 1) return false;
+
+    result[index] = [ keys[0], pair[keys[0]] ];
+  }
+
+  return true;
+}
+
+function constructYamlPairs(data) {
+  if (data === null) return [];
+
+  var index, length, pair, keys, result,
+      object = data;
+
+  result = new Array(object.length);
+
+  for (index = 0, length = object.length; index < length; index += 1) {
+    pair = object[index];
+
+    keys = Object.keys(pair);
+
+    result[index] = [ keys[0], pair[keys[0]] ];
+  }
+
+  return result;
+}
+
+module.exports = new Type('tag:yaml.org,2002:pairs', {
+  kind: 'sequence',
+  resolve: resolveYamlPairs,
+  construct: constructYamlPairs
+});
+
+},{"../type":13}],26:[function(require,module,exports){
+'use strict';
+
+var Type = require('../type');
+
+module.exports = new Type('tag:yaml.org,2002:seq', {
+  kind: 'sequence',
+  construct: function (data) { return data !== null ? data : []; }
+});
+
+},{"../type":13}],27:[function(require,module,exports){
+'use strict';
+
+var Type = require('../type');
+
+var _hasOwnProperty = Object.prototype.hasOwnProperty;
+
+function resolveYamlSet(data) {
+  if (data === null) return true;
+
+  var key, object = data;
+
+  for (key in object) {
+    if (_hasOwnProperty.call(object, key)) {
+      if (object[key] !== null) return false;
+    }
+  }
+
+  return true;
+}
+
+function constructYamlSet(data) {
+  return data !== null ? data : {};
+}
+
+module.exports = new Type('tag:yaml.org,2002:set', {
+  kind: 'mapping',
+  resolve: resolveYamlSet,
+  construct: constructYamlSet
+});
+
+},{"../type":13}],28:[function(require,module,exports){
+'use strict';
+
+var Type = require('../type');
+
+module.exports = new Type('tag:yaml.org,2002:str', {
+  kind: 'scalar',
+  construct: function (data) { return data !== null ? data : ''; }
+});
+
+},{"../type":13}],29:[function(require,module,exports){
+'use strict';
+
+var Type = require('../type');
+
+var YAML_DATE_REGEXP = new RegExp(
+  '^([0-9][0-9][0-9][0-9])'          + // [1] year
+  '-([0-9][0-9])'                    + // [2] month
+  '-([0-9][0-9])$');                   // [3] day
+
+var YAML_TIMESTAMP_REGEXP = new RegExp(
+  '^([0-9][0-9][0-9][0-9])'          + // [1] year
+  '-([0-9][0-9]?)'                   + // [2] month
+  '-([0-9][0-9]?)'                   + // [3] day
+  '(?:[Tt]|[ \\t]+)'                 + // ...
+  '([0-9][0-9]?)'                    + // [4] hour
+  ':([0-9][0-9])'                    + // [5] minute
+  ':([0-9][0-9])'                    + // [6] second
+  '(?:\\.([0-9]*))?'                 + // [7] fraction
+  '(?:[ \\t]*(Z|([-+])([0-9][0-9]?)' + // [8] tz [9] tz_sign [10] tz_hour
+  '(?::([0-9][0-9]))?))?$');           // [11] tz_minute
+
+function resolveYamlTimestamp(data) {
+  if (data === null) return false;
+  if (YAML_DATE_REGEXP.exec(data) !== null) return true;
+  if (YAML_TIMESTAMP_REGEXP.exec(data) !== null) return true;
+  return false;
+}
+
+function constructYamlTimestamp(data) {
+  var match, year, month, day, hour, minute, second, fraction = 0,
+      delta = null, tz_hour, tz_minute, date;
+
+  match = YAML_DATE_REGEXP.exec(data);
+  if (match === null) match = YAML_TIMESTAMP_REGEXP.exec(data);
+
+  if (match === null) throw new Error('Date resolve error');
+
+  // match: [1] year [2] month [3] day
+
+  year = +(match[1]);
+  month = +(match[2]) - 1; // JS month starts with 0
+  day = +(match[3]);
+
+  if (!match[4]) { // no hour
+    return new Date(Date.UTC(year, month, day));
+  }
+
+  // match: [4] hour [5] minute [6] second [7] fraction
+
+  hour = +(match[4]);
+  minute = +(match[5]);
+  second = +(match[6]);
+
+  if (match[7]) {
+    fraction = match[7].slice(0, 3);
+    while (fraction.length < 3) { // milli-seconds
+      fraction += '0';
+    }
+    fraction = +fraction;
+  }
+
+  // match: [8] tz [9] tz_sign [10] tz_hour [11] tz_minute
+
+  if (match[9]) {
+    tz_hour = +(match[10]);
+    tz_minute = +(match[11] || 0);
+    delta = (tz_hour * 60 + tz_minute) * 60000; // delta in mili-seconds
+    if (match[9] === '-') delta = -delta;
+  }
+
+  date = new Date(Date.UTC(year, month, day, hour, minute, second, fraction));
+
+  if (delta) date.setTime(date.getTime() - delta);
+
+  return date;
+}
+
+function representYamlTimestamp(object /*, style*/) {
+  return object.toISOString();
+}
+
+module.exports = new Type('tag:yaml.org,2002:timestamp', {
+  kind: 'scalar',
+  resolve: resolveYamlTimestamp,
+  construct: constructYamlTimestamp,
+  instanceOf: Date,
+  represent: representYamlTimestamp
+});
+
+},{"../type":13}],"/":[function(require,module,exports){
+'use strict';
+
+
+var yaml = require('./lib/js-yaml.js');
+
+
+module.exports = yaml;
+
+},{"./lib/js-yaml.js":1}]},{},[])("/")
+});
\ No newline at end of file
diff --git a/node_modules/svgo/node_modules/js-yaml/dist/js-yaml.min.js b/node_modules/svgo/node_modules/js-yaml/dist/js-yaml.min.js
new file mode 100644
index 00000000..211c64ce
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/dist/js-yaml.min.js
@@ -0,0 +1,3 @@
+/* js-yaml 3.7.0 https://github.com/nodeca/js-yaml */
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null}function o(e){return null===e}var a=e("../type");t.exports=new a("tag:yaml.org,2002:null",{kind:"scalar",resolve:i,construct:r,predicate:o,represent:{canonical:function(){return"~"},lowercase:function(){return"null"},uppercase:function(){return"NULL"},camelcase:function(){return"Null"}},defaultStyle:"lowercase"})},{"../type":13}],24:[function(e,t,n){"use strict";function i(e){if(null===e)return!0;var t,n,i,r,o,c=[],u=e;for(t=0,n=u.length;t<n;t+=1){if(i=u[t],o=!1,"[object Object]"!==s.call(i))return!1;for(r in i)if(a.call(i,r)){if(o)return!1;o=!0}if(!o)return!1;if(c.indexOf(r)!==-1)return!1;c.push(r)}return!0}function r(e){return null!==e?e:[]}var o=e("../type"),a=Object.prototype.hasOwnProperty,s=Object.prototype.toString;t.exports=new o("tag:yaml.org,2002:omap",{kind:"sequence",resolve:i,construct:r})},{"../type":13}],25:[function(e,t,n){"use strict";function i(e){if(null===e)return!0;var t,n,i,r,o,s=e;for(o=new Array(s.length),t=0,n=s.length;t<n;t+=1){if(i=s[t],"[object Object]"!==a.call(i))return!1;if(r=Object.keys(i),1!==r.length)return!1;o[t]=[r[0],i[r[0]]]}return!0}function r(e){if(null===e)return[];var t,n,i,r,o,a=e;for(o=new Array(a.length),t=0,n=a.length;t<n;t+=1)i=a[t],r=Object.keys(i),o[t]=[r[0],i[r[0]]];return o}var o=e("../type"),a=Object.prototype.toString;t.exports=new o("tag:yaml.org,2002:pairs",{kind:"sequence",resolve:i,construct:r})},{"../type":13}],26:[function(e,t,n){"use strict";var i=e("../type");t.exports=new i("tag:yaml.org,2002:seq",{kind:"sequence",construct:function(e){return null!==e?e:[]}})},{"../type":13}],27:[function(e,t,n){"use strict";function i(e){if(null===e)return!0;var t,n=e;for(t in n)if(a.call(n,t)&&null!==n[t])return!1;return!0}function r(e){return null!==e?e:{}}var o=e("../type"),a=Object.prototype.hasOwnProperty;t.exports=new o("tag:yaml.org,2002:set",{kind:"mapping",resolve:i,construct:r})},{"../type":13}],28:[function(e,t,n){"use strict";var i=e("../type");t.exports=new i("tag:yaml.org,2002:str",{kind:"scalar",construct:function(e){return null!==e?e:""}})},{"../type":13}],29:[function(e,t,n){"use strict";function i(e){return null!==e&&(null!==s.exec(e)||null!==c.exec(e))}function r(e){var t,n,i,r,o,a,u,l,p,f,d=0,h=null;if(t=s.exec(e),null===t&&(t=c.exec(e)),null===t)throw new Error("Date resolve error");if(n=+t[1],i=+t[2]-1,r=+t[3],!t[4])return new Date(Date.UTC(n,i,r));if(o=+t[4],a=+t[5],u=+t[6],t[7]){for(d=t[7].slice(0,3);d.length<3;)d+="0";d=+d}return t[9]&&(l=+t[10],p=+(t[11]||0),h=6e4*(60*l+p),"-"===t[9]&&(h=-h)),f=new Date(Date.UTC(n,i,r,o,a,u,d)),h&&f.setTime(f.getTime()-h),f}function o(e){return e.toISOString()}var a=e("../type"),s=new RegExp("^([0-9][0-9][0-9][0-9])-([0-9][0-9])-([0-9][0-9])$"),c=new RegExp("^([0-9][0-9][0-9][0-9])-([0-9][0-9]?)-([0-9][0-9]?)(?:[Tt]|[ \\t]+)([0-9][0-9]?):([0-9][0-9]):([0-9][0-9])(?:\\.([0-9]*))?(?:[ \\t]*(Z|([-+])([0-9][0-9]?)(?::([0-9][0-9]))?))?$");t.exports=new a("tag:yaml.org,2002:timestamp",{kind:"scalar",resolve:i,construct:r,instanceOf:Date,represent:o})},{"../type":13}],"/":[function(e,t,n){"use strict";var i=e("./lib/js-yaml.js");t.exports=i},{"./lib/js-yaml.js":1}]},{},[])("/")});
diff --git a/node_modules/svgo/node_modules/js-yaml/index.js b/node_modules/svgo/node_modules/js-yaml/index.js
new file mode 100644
index 00000000..13744352
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/index.js
@@ -0,0 +1,7 @@
+'use strict';
+
+
+var yaml = require('./lib/js-yaml.js');
+
+
+module.exports = yaml;
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml.js
new file mode 100644
index 00000000..f0e92818
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml.js
@@ -0,0 +1,39 @@
+'use strict';
+
+
+var loader = require('./js-yaml/loader');
+var dumper = require('./js-yaml/dumper');
+
+
+function deprecated(name) {
+  return function () {
+    throw new Error('Function ' + name + ' is deprecated and cannot be used.');
+  };
+}
+
+
+module.exports.Type                = require('./js-yaml/type');
+module.exports.Schema              = require('./js-yaml/schema');
+module.exports.FAILSAFE_SCHEMA     = require('./js-yaml/schema/failsafe');
+module.exports.JSON_SCHEMA         = require('./js-yaml/schema/json');
+module.exports.CORE_SCHEMA         = require('./js-yaml/schema/core');
+module.exports.DEFAULT_SAFE_SCHEMA = require('./js-yaml/schema/default_safe');
+module.exports.DEFAULT_FULL_SCHEMA = require('./js-yaml/schema/default_full');
+module.exports.load                = loader.load;
+module.exports.loadAll             = loader.loadAll;
+module.exports.safeLoad            = loader.safeLoad;
+module.exports.safeLoadAll         = loader.safeLoadAll;
+module.exports.dump                = dumper.dump;
+module.exports.safeDump            = dumper.safeDump;
+module.exports.YAMLException       = require('./js-yaml/exception');
+
+// Deprecated schema names from JS-YAML 2.0.x
+module.exports.MINIMAL_SCHEMA = require('./js-yaml/schema/failsafe');
+module.exports.SAFE_SCHEMA    = require('./js-yaml/schema/default_safe');
+module.exports.DEFAULT_SCHEMA = require('./js-yaml/schema/default_full');
+
+// Deprecated functions from JS-YAML 1.x.x
+module.exports.scan           = deprecated('scan');
+module.exports.parse          = deprecated('parse');
+module.exports.compose        = deprecated('compose');
+module.exports.addConstructor = deprecated('addConstructor');
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/common.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/common.js
new file mode 100644
index 00000000..25ef7d8e
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/common.js
@@ -0,0 +1,59 @@
+'use strict';
+
+
+function isNothing(subject) {
+  return (typeof subject === 'undefined') || (subject === null);
+}
+
+
+function isObject(subject) {
+  return (typeof subject === 'object') && (subject !== null);
+}
+
+
+function toArray(sequence) {
+  if (Array.isArray(sequence)) return sequence;
+  else if (isNothing(sequence)) return [];
+
+  return [ sequence ];
+}
+
+
+function extend(target, source) {
+  var index, length, key, sourceKeys;
+
+  if (source) {
+    sourceKeys = Object.keys(source);
+
+    for (index = 0, length = sourceKeys.length; index < length; index += 1) {
+      key = sourceKeys[index];
+      target[key] = source[key];
+    }
+  }
+
+  return target;
+}
+
+
+function repeat(string, count) {
+  var result = '', cycle;
+
+  for (cycle = 0; cycle < count; cycle += 1) {
+    result += string;
+  }
+
+  return result;
+}
+
+
+function isNegativeZero(number) {
+  return (number === 0) && (Number.NEGATIVE_INFINITY === 1 / number);
+}
+
+
+module.exports.isNothing      = isNothing;
+module.exports.isObject       = isObject;
+module.exports.toArray        = toArray;
+module.exports.repeat         = repeat;
+module.exports.isNegativeZero = isNegativeZero;
+module.exports.extend         = extend;
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/dumper.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/dumper.js
new file mode 100644
index 00000000..203f436b
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/dumper.js
@@ -0,0 +1,801 @@
+'use strict';
+
+/*eslint-disable no-use-before-define*/
+
+var common              = require('./common');
+var YAMLException       = require('./exception');
+var DEFAULT_FULL_SCHEMA = require('./schema/default_full');
+var DEFAULT_SAFE_SCHEMA = require('./schema/default_safe');
+
+var _toString       = Object.prototype.toString;
+var _hasOwnProperty = Object.prototype.hasOwnProperty;
+
+var CHAR_TAB                  = 0x09; /* Tab */
+var CHAR_LINE_FEED            = 0x0A; /* LF */
+var CHAR_SPACE                = 0x20; /* Space */
+var CHAR_EXCLAMATION          = 0x21; /* ! */
+var CHAR_DOUBLE_QUOTE         = 0x22; /* " */
+var CHAR_SHARP                = 0x23; /* # */
+var CHAR_PERCENT              = 0x25; /* % */
+var CHAR_AMPERSAND            = 0x26; /* & */
+var CHAR_SINGLE_QUOTE         = 0x27; /* ' */
+var CHAR_ASTERISK             = 0x2A; /* * */
+var CHAR_COMMA                = 0x2C; /* , */
+var CHAR_MINUS                = 0x2D; /* - */
+var CHAR_COLON                = 0x3A; /* : */
+var CHAR_GREATER_THAN         = 0x3E; /* > */
+var CHAR_QUESTION             = 0x3F; /* ? */
+var CHAR_COMMERCIAL_AT        = 0x40; /* @ */
+var CHAR_LEFT_SQUARE_BRACKET  = 0x5B; /* [ */
+var CHAR_RIGHT_SQUARE_BRACKET = 0x5D; /* ] */
+var CHAR_GRAVE_ACCENT         = 0x60; /* ` */
+var CHAR_LEFT_CURLY_BRACKET   = 0x7B; /* { */
+var CHAR_VERTICAL_LINE        = 0x7C; /* | */
+var CHAR_RIGHT_CURLY_BRACKET  = 0x7D; /* } */
+
+var ESCAPE_SEQUENCES = {};
+
+ESCAPE_SEQUENCES[0x00]   = '\\0';
+ESCAPE_SEQUENCES[0x07]   = '\\a';
+ESCAPE_SEQUENCES[0x08]   = '\\b';
+ESCAPE_SEQUENCES[0x09]   = '\\t';
+ESCAPE_SEQUENCES[0x0A]   = '\\n';
+ESCAPE_SEQUENCES[0x0B]   = '\\v';
+ESCAPE_SEQUENCES[0x0C]   = '\\f';
+ESCAPE_SEQUENCES[0x0D]   = '\\r';
+ESCAPE_SEQUENCES[0x1B]   = '\\e';
+ESCAPE_SEQUENCES[0x22]   = '\\"';
+ESCAPE_SEQUENCES[0x5C]   = '\\\\';
+ESCAPE_SEQUENCES[0x85]   = '\\N';
+ESCAPE_SEQUENCES[0xA0]   = '\\_';
+ESCAPE_SEQUENCES[0x2028] = '\\L';
+ESCAPE_SEQUENCES[0x2029] = '\\P';
+
+var DEPRECATED_BOOLEANS_SYNTAX = [
+  'y', 'Y', 'yes', 'Yes', 'YES', 'on', 'On', 'ON',
+  'n', 'N', 'no', 'No', 'NO', 'off', 'Off', 'OFF'
+];
+
+function compileStyleMap(schema, map) {
+  var result, keys, index, length, tag, style, type;
+
+  if (map === null) return {};
+
+  result = {};
+  keys = Object.keys(map);
+
+  for (index = 0, length = keys.length; index < length; index += 1) {
+    tag = keys[index];
+    style = String(map[tag]);
+
+    if (tag.slice(0, 2) === '!!') {
+      tag = 'tag:yaml.org,2002:' + tag.slice(2);
+    }
+    type = schema.compiledTypeMap['fallback'][tag];
+
+    if (type && _hasOwnProperty.call(type.styleAliases, style)) {
+      style = type.styleAliases[style];
+    }
+
+    result[tag] = style;
+  }
+
+  return result;
+}
+
+function encodeHex(character) {
+  var string, handle, length;
+
+  string = character.toString(16).toUpperCase();
+
+  if (character <= 0xFF) {
+    handle = 'x';
+    length = 2;
+  } else if (character <= 0xFFFF) {
+    handle = 'u';
+    length = 4;
+  } else if (character <= 0xFFFFFFFF) {
+    handle = 'U';
+    length = 8;
+  } else {
+    throw new YAMLException('code point within a string may not be greater than 0xFFFFFFFF');
+  }
+
+  return '\\' + handle + common.repeat('0', length - string.length) + string;
+}
+
+function State(options) {
+  this.schema       = options['schema'] || DEFAULT_FULL_SCHEMA;
+  this.indent       = Math.max(1, (options['indent'] || 2));
+  this.skipInvalid  = options['skipInvalid'] || false;
+  this.flowLevel    = (common.isNothing(options['flowLevel']) ? -1 : options['flowLevel']);
+  this.styleMap     = compileStyleMap(this.schema, options['styles'] || null);
+  this.sortKeys     = options['sortKeys'] || false;
+  this.lineWidth    = options['lineWidth'] || 80;
+  this.noRefs       = options['noRefs'] || false;
+  this.noCompatMode = options['noCompatMode'] || false;
+
+  this.implicitTypes = this.schema.compiledImplicit;
+  this.explicitTypes = this.schema.compiledExplicit;
+
+  this.tag = null;
+  this.result = '';
+
+  this.duplicates = [];
+  this.usedDuplicates = null;
+}
+
+// Indents every line in a string. Empty lines (\n only) are not indented.
+function indentString(string, spaces) {
+  var ind = common.repeat(' ', spaces),
+      position = 0,
+      next = -1,
+      result = '',
+      line,
+      length = string.length;
+
+  while (position < length) {
+    next = string.indexOf('\n', position);
+    if (next === -1) {
+      line = string.slice(position);
+      position = length;
+    } else {
+      line = string.slice(position, next + 1);
+      position = next + 1;
+    }
+
+    if (line.length && line !== '\n') result += ind;
+
+    result += line;
+  }
+
+  return result;
+}
+
+function generateNextLine(state, level) {
+  return '\n' + common.repeat(' ', state.indent * level);
+}
+
+function testImplicitResolving(state, str) {
+  var index, length, type;
+
+  for (index = 0, length = state.implicitTypes.length; index < length; index += 1) {
+    type = state.implicitTypes[index];
+
+    if (type.resolve(str)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+// [33] s-white ::= s-space | s-tab
+function isWhitespace(c) {
+  return c === CHAR_SPACE || c === CHAR_TAB;
+}
+
+// Returns true if the character can be printed without escaping.
+// From YAML 1.2: "any allowed characters known to be non-printable
+// should also be escaped. [However,] This isn’t mandatory"
+// Derived from nb-char - \t - #x85 - #xA0 - #x2028 - #x2029.
+function isPrintable(c) {
+  return  (0x00020 <= c && c <= 0x00007E)
+      || ((0x000A1 <= c && c <= 0x00D7FF) && c !== 0x2028 && c !== 0x2029)
+      || ((0x0E000 <= c && c <= 0x00FFFD) && c !== 0xFEFF /* BOM */)
+      ||  (0x10000 <= c && c <= 0x10FFFF);
+}
+
+// Simplified test for values allowed after the first character in plain style.
+function isPlainSafe(c) {
+  // Uses a subset of nb-char - c-flow-indicator - ":" - "#"
+  // where nb-char ::= c-printable - b-char - c-byte-order-mark.
+  return isPrintable(c) && c !== 0xFEFF
+    // - c-flow-indicator
+    && c !== CHAR_COMMA
+    && c !== CHAR_LEFT_SQUARE_BRACKET
+    && c !== CHAR_RIGHT_SQUARE_BRACKET
+    && c !== CHAR_LEFT_CURLY_BRACKET
+    && c !== CHAR_RIGHT_CURLY_BRACKET
+    // - ":" - "#"
+    && c !== CHAR_COLON
+    && c !== CHAR_SHARP;
+}
+
+// Simplified test for values allowed as the first character in plain style.
+function isPlainSafeFirst(c) {
+  // Uses a subset of ns-char - c-indicator
+  // where ns-char = nb-char - s-white.
+  return isPrintable(c) && c !== 0xFEFF
+    && !isWhitespace(c) // - s-white
+    // - (c-indicator ::=
+    // “-” | “?” | “:” | “,” | “[” | “]” | “{” | “}”
+    && c !== CHAR_MINUS
+    && c !== CHAR_QUESTION
+    && c !== CHAR_COLON
+    && c !== CHAR_COMMA
+    && c !== CHAR_LEFT_SQUARE_BRACKET
+    && c !== CHAR_RIGHT_SQUARE_BRACKET
+    && c !== CHAR_LEFT_CURLY_BRACKET
+    && c !== CHAR_RIGHT_CURLY_BRACKET
+    // | “#” | “&” | “*” | “!” | “|” | “>” | “'” | “"”
+    && c !== CHAR_SHARP
+    && c !== CHAR_AMPERSAND
+    && c !== CHAR_ASTERISK
+    && c !== CHAR_EXCLAMATION
+    && c !== CHAR_VERTICAL_LINE
+    && c !== CHAR_GREATER_THAN
+    && c !== CHAR_SINGLE_QUOTE
+    && c !== CHAR_DOUBLE_QUOTE
+    // | “%” | “@” | “`”)
+    && c !== CHAR_PERCENT
+    && c !== CHAR_COMMERCIAL_AT
+    && c !== CHAR_GRAVE_ACCENT;
+}
+
+var STYLE_PLAIN   = 1,
+    STYLE_SINGLE  = 2,
+    STYLE_LITERAL = 3,
+    STYLE_FOLDED  = 4,
+    STYLE_DOUBLE  = 5;
+
+// Determines which scalar styles are possible and returns the preferred style.
+// lineWidth = -1 => no limit.
+// Pre-conditions: str.length > 0.
+// Post-conditions:
+//    STYLE_PLAIN or STYLE_SINGLE => no \n are in the string.
+//    STYLE_LITERAL => no lines are suitable for folding (or lineWidth is -1).
+//    STYLE_FOLDED => a line > lineWidth and can be folded (and lineWidth != -1).
+function chooseScalarStyle(string, singleLineOnly, indentPerLevel, lineWidth, testAmbiguousType) {
+  var i;
+  var char;
+  var hasLineBreak = false;
+  var hasFoldableLine = false; // only checked if shouldTrackWidth
+  var shouldTrackWidth = lineWidth !== -1;
+  var previousLineBreak = -1; // count the first line correctly
+  var plain = isPlainSafeFirst(string.charCodeAt(0))
+          && !isWhitespace(string.charCodeAt(string.length - 1));
+
+  if (singleLineOnly) {
+    // Case: no block styles.
+    // Check for disallowed characters to rule out plain and single.
+    for (i = 0; i < string.length; i++) {
+      char = string.charCodeAt(i);
+      if (!isPrintable(char)) {
+        return STYLE_DOUBLE;
+      }
+      plain = plain && isPlainSafe(char);
+    }
+  } else {
+    // Case: block styles permitted.
+    for (i = 0; i < string.length; i++) {
+      char = string.charCodeAt(i);
+      if (char === CHAR_LINE_FEED) {
+        hasLineBreak = true;
+        // Check if any line can be folded.
+        if (shouldTrackWidth) {
+          hasFoldableLine = hasFoldableLine ||
+            // Foldable line = too long, and not more-indented.
+            (i - previousLineBreak - 1 > lineWidth &&
+             string[previousLineBreak + 1] !== ' ');
+          previousLineBreak = i;
+        }
+      } else if (!isPrintable(char)) {
+        return STYLE_DOUBLE;
+      }
+      plain = plain && isPlainSafe(char);
+    }
+    // in case the end is missing a \n
+    hasFoldableLine = hasFoldableLine || (shouldTrackWidth &&
+      (i - previousLineBreak - 1 > lineWidth &&
+       string[previousLineBreak + 1] !== ' '));
+  }
+  // Although every style can represent \n without escaping, prefer block styles
+  // for multiline, since they're more readable and they don't add empty lines.
+  // Also prefer folding a super-long line.
+  if (!hasLineBreak && !hasFoldableLine) {
+    // Strings interpretable as another type have to be quoted;
+    // e.g. the string 'true' vs. the boolean true.
+    return plain && !testAmbiguousType(string)
+      ? STYLE_PLAIN : STYLE_SINGLE;
+  }
+  // Edge case: block indentation indicator can only have one digit.
+  if (string[0] === ' ' && indentPerLevel > 9) {
+    return STYLE_DOUBLE;
+  }
+  // At this point we know block styles are valid.
+  // Prefer literal style unless we want to fold.
+  return hasFoldableLine ? STYLE_FOLDED : STYLE_LITERAL;
+}
+
+// Note: line breaking/folding is implemented for only the folded style.
+// NB. We drop the last trailing newline (if any) of a returned block scalar
+//  since the dumper adds its own newline. This always works:
+//    • No ending newline => unaffected; already using strip "-" chomping.
+//    • Ending newline    => removed then restored.
+//  Importantly, this keeps the "+" chomp indicator from gaining an extra line.
+function writeScalar(state, string, level, iskey) {
+  state.dump = (function () {
+    if (string.length === 0) {
+      return "''";
+    }
+    if (!state.noCompatMode &&
+        DEPRECATED_BOOLEANS_SYNTAX.indexOf(string) !== -1) {
+      return "'" + string + "'";
+    }
+
+    var indent = state.indent * Math.max(1, level); // no 0-indent scalars
+    // As indentation gets deeper, let the width decrease monotonically
+    // to the lower bound min(state.lineWidth, 40).
+    // Note that this implies
+    //  state.lineWidth ≤ 40 + state.indent: width is fixed at the lower bound.
+    //  state.lineWidth > 40 + state.indent: width decreases until the lower bound.
+    // This behaves better than a constant minimum width which disallows narrower options,
+    // or an indent threshold which causes the width to suddenly increase.
+    var lineWidth = state.lineWidth === -1
+      ? -1 : Math.max(Math.min(state.lineWidth, 40), state.lineWidth - indent);
+
+    // Without knowing if keys are implicit/explicit, assume implicit for safety.
+    var singleLineOnly = iskey
+      // No block styles in flow mode.
+      || (state.flowLevel > -1 && level >= state.flowLevel);
+    function testAmbiguity(string) {
+      return testImplicitResolving(state, string);
+    }
+
+    switch (chooseScalarStyle(string, singleLineOnly, state.indent, lineWidth, testAmbiguity)) {
+      case STYLE_PLAIN:
+        return string;
+      case STYLE_SINGLE:
+        return "'" + string.replace(/'/g, "''") + "'";
+      case STYLE_LITERAL:
+        return '|' + blockHeader(string, state.indent)
+          + dropEndingNewline(indentString(string, indent));
+      case STYLE_FOLDED:
+        return '>' + blockHeader(string, state.indent)
+          + dropEndingNewline(indentString(foldString(string, lineWidth), indent));
+      case STYLE_DOUBLE:
+        return '"' + escapeString(string, lineWidth) + '"';
+      default:
+        throw new YAMLException('impossible error: invalid scalar style');
+    }
+  }());
+}
+
+// Pre-conditions: string is valid for a block scalar, 1 <= indentPerLevel <= 9.
+function blockHeader(string, indentPerLevel) {
+  var indentIndicator = (string[0] === ' ') ? String(indentPerLevel) : '';
+
+  // note the special case: the string '\n' counts as a "trailing" empty line.
+  var clip =          string[string.length - 1] === '\n';
+  var keep = clip && (string[string.length - 2] === '\n' || string === '\n');
+  var chomp = keep ? '+' : (clip ? '' : '-');
+
+  return indentIndicator + chomp + '\n';
+}
+
+// (See the note for writeScalar.)
+function dropEndingNewline(string) {
+  return string[string.length - 1] === '\n' ? string.slice(0, -1) : string;
+}
+
+// Note: a long line without a suitable break point will exceed the width limit.
+// Pre-conditions: every char in str isPrintable, str.length > 0, width > 0.
+function foldString(string, width) {
+  // In folded style, $k$ consecutive newlines output as $k+1$ newlines—
+  // unless they're before or after a more-indented line, or at the very
+  // beginning or end, in which case $k$ maps to $k$.
+  // Therefore, parse each chunk as newline(s) followed by a content line.
+  var lineRe = /(\n+)([^\n]*)/g;
+
+  // first line (possibly an empty line)
+  var result = (function () {
+    var nextLF = string.indexOf('\n');
+    nextLF = nextLF !== -1 ? nextLF : string.length;
+    lineRe.lastIndex = nextLF;
+    return foldLine(string.slice(0, nextLF), width);
+  }());
+  // If we haven't reached the first content line yet, don't add an extra \n.
+  var prevMoreIndented = string[0] === '\n' || string[0] === ' ';
+  var moreIndented;
+
+  // rest of the lines
+  var match;
+  while ((match = lineRe.exec(string))) {
+    var prefix = match[1], line = match[2];
+    moreIndented = (line[0] === ' ');
+    result += prefix
+      + (!prevMoreIndented && !moreIndented && line !== ''
+        ? '\n' : '')
+      + foldLine(line, width);
+    prevMoreIndented = moreIndented;
+  }
+
+  return result;
+}
+
+// Greedy line breaking.
+// Picks the longest line under the limit each time,
+// otherwise settles for the shortest line over the limit.
+// NB. More-indented lines *cannot* be folded, as that would add an extra \n.
+function foldLine(line, width) {
+  if (line === '' || line[0] === ' ') return line;
+
+  // Since a more-indented line adds a \n, breaks can't be followed by a space.
+  var breakRe = / [^ ]/g; // note: the match index will always be <= length-2.
+  var match;
+  // start is an inclusive index. end, curr, and next are exclusive.
+  var start = 0, end, curr = 0, next = 0;
+  var result = '';
+
+  // Invariants: 0 <= start <= length-1.
+  //   0 <= curr <= next <= max(0, length-2). curr - start <= width.
+  // Inside the loop:
+  //   A match implies length >= 2, so curr and next are <= length-2.
+  while ((match = breakRe.exec(line))) {
+    next = match.index;
+    // maintain invariant: curr - start <= width
+    if (next - start > width) {
+      end = (curr > start) ? curr : next; // derive end <= length-2
+      result += '\n' + line.slice(start, end);
+      // skip the space that was output as \n
+      start = end + 1;                    // derive start <= length-1
+    }
+    curr = next;
+  }
+
+  // By the invariants, start <= length-1, so there is something left over.
+  // It is either the whole string or a part starting from non-whitespace.
+  result += '\n';
+  // Insert a break if the remainder is too long and there is a break available.
+  if (line.length - start > width && curr > start) {
+    result += line.slice(start, curr) + '\n' + line.slice(curr + 1);
+  } else {
+    result += line.slice(start);
+  }
+
+  return result.slice(1); // drop extra \n joiner
+}
+
+// Escapes a double-quoted string.
+function escapeString(string) {
+  var result = '';
+  var char;
+  var escapeSeq;
+
+  for (var i = 0; i < string.length; i++) {
+    char = string.charCodeAt(i);
+    escapeSeq = ESCAPE_SEQUENCES[char];
+    result += !escapeSeq && isPrintable(char)
+      ? string[i]
+      : escapeSeq || encodeHex(char);
+  }
+
+  return result;
+}
+
+function writeFlowSequence(state, level, object) {
+  var _result = '',
+      _tag    = state.tag,
+      index,
+      length;
+
+  for (index = 0, length = object.length; index < length; index += 1) {
+    // Write only valid elements.
+    if (writeNode(state, level, object[index], false, false)) {
+      if (index !== 0) _result += ', ';
+      _result += state.dump;
+    }
+  }
+
+  state.tag = _tag;
+  state.dump = '[' + _result + ']';
+}
+
+function writeBlockSequence(state, level, object, compact) {
+  var _result = '',
+      _tag    = state.tag,
+      index,
+      length;
+
+  for (index = 0, length = object.length; index < length; index += 1) {
+    // Write only valid elements.
+    if (writeNode(state, level + 1, object[index], true, true)) {
+      if (!compact || index !== 0) {
+        _result += generateNextLine(state, level);
+      }
+      _result += '- ' + state.dump;
+    }
+  }
+
+  state.tag = _tag;
+  state.dump = _result || '[]'; // Empty sequence if no valid values.
+}
+
+function writeFlowMapping(state, level, object) {
+  var _result       = '',
+      _tag          = state.tag,
+      objectKeyList = Object.keys(object),
+      index,
+      length,
+      objectKey,
+      objectValue,
+      pairBuffer;
+
+  for (index = 0, length = objectKeyList.length; index < length; index += 1) {
+    pairBuffer = '';
+
+    if (index !== 0) pairBuffer += ', ';
+
+    objectKey = objectKeyList[index];
+    objectValue = object[objectKey];
+
+    if (!writeNode(state, level, objectKey, false, false)) {
+      continue; // Skip this pair because of invalid key;
+    }
+
+    if (state.dump.length > 1024) pairBuffer += '? ';
+
+    pairBuffer += state.dump + ': ';
+
+    if (!writeNode(state, level, objectValue, false, false)) {
+      continue; // Skip this pair because of invalid value.
+    }
+
+    pairBuffer += state.dump;
+
+    // Both key and value are valid.
+    _result += pairBuffer;
+  }
+
+  state.tag = _tag;
+  state.dump = '{' + _result + '}';
+}
+
+function writeBlockMapping(state, level, object, compact) {
+  var _result       = '',
+      _tag          = state.tag,
+      objectKeyList = Object.keys(object),
+      index,
+      length,
+      objectKey,
+      objectValue,
+      explicitPair,
+      pairBuffer;
+
+  // Allow sorting keys so that the output file is deterministic
+  if (state.sortKeys === true) {
+    // Default sorting
+    objectKeyList.sort();
+  } else if (typeof state.sortKeys === 'function') {
+    // Custom sort function
+    objectKeyList.sort(state.sortKeys);
+  } else if (state.sortKeys) {
+    // Something is wrong
+    throw new YAMLException('sortKeys must be a boolean or a function');
+  }
+
+  for (index = 0, length = objectKeyList.length; index < length; index += 1) {
+    pairBuffer = '';
+
+    if (!compact || index !== 0) {
+      pairBuffer += generateNextLine(state, level);
+    }
+
+    objectKey = objectKeyList[index];
+    objectValue = object[objectKey];
+
+    if (!writeNode(state, level + 1, objectKey, true, true, true)) {
+      continue; // Skip this pair because of invalid key.
+    }
+
+    explicitPair = (state.tag !== null && state.tag !== '?') ||
+                   (state.dump && state.dump.length > 1024);
+
+    if (explicitPair) {
+      if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) {
+        pairBuffer += '?';
+      } else {
+        pairBuffer += '? ';
+      }
+    }
+
+    pairBuffer += state.dump;
+
+    if (explicitPair) {
+      pairBuffer += generateNextLine(state, level);
+    }
+
+    if (!writeNode(state, level + 1, objectValue, true, explicitPair)) {
+      continue; // Skip this pair because of invalid value.
+    }
+
+    if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) {
+      pairBuffer += ':';
+    } else {
+      pairBuffer += ': ';
+    }
+
+    pairBuffer += state.dump;
+
+    // Both key and value are valid.
+    _result += pairBuffer;
+  }
+
+  state.tag = _tag;
+  state.dump = _result || '{}'; // Empty mapping if no valid pairs.
+}
+
+function detectType(state, object, explicit) {
+  var _result, typeList, index, length, type, style;
+
+  typeList = explicit ? state.explicitTypes : state.implicitTypes;
+
+  for (index = 0, length = typeList.length; index < length; index += 1) {
+    type = typeList[index];
+
+    if ((type.instanceOf  || type.predicate) &&
+        (!type.instanceOf || ((typeof object === 'object') && (object instanceof type.instanceOf))) &&
+        (!type.predicate  || type.predicate(object))) {
+
+      state.tag = explicit ? type.tag : '?';
+
+      if (type.represent) {
+        style = state.styleMap[type.tag] || type.defaultStyle;
+
+        if (_toString.call(type.represent) === '[object Function]') {
+          _result = type.represent(object, style);
+        } else if (_hasOwnProperty.call(type.represent, style)) {
+          _result = type.represent[style](object, style);
+        } else {
+          throw new YAMLException('!<' + type.tag + '> tag resolver accepts not "' + style + '" style');
+        }
+
+        state.dump = _result;
+      }
+
+      return true;
+    }
+  }
+
+  return false;
+}
+
+// Serializes `object` and writes it to global `result`.
+// Returns true on success, or false on invalid object.
+//
+function writeNode(state, level, object, block, compact, iskey) {
+  state.tag = null;
+  state.dump = object;
+
+  if (!detectType(state, object, false)) {
+    detectType(state, object, true);
+  }
+
+  var type = _toString.call(state.dump);
+
+  if (block) {
+    block = (state.flowLevel < 0 || state.flowLevel > level);
+  }
+
+  var objectOrArray = type === '[object Object]' || type === '[object Array]',
+      duplicateIndex,
+      duplicate;
+
+  if (objectOrArray) {
+    duplicateIndex = state.duplicates.indexOf(object);
+    duplicate = duplicateIndex !== -1;
+  }
+
+  if ((state.tag !== null && state.tag !== '?') || duplicate || (state.indent !== 2 && level > 0)) {
+    compact = false;
+  }
+
+  if (duplicate && state.usedDuplicates[duplicateIndex]) {
+    state.dump = '*ref_' + duplicateIndex;
+  } else {
+    if (objectOrArray && duplicate && !state.usedDuplicates[duplicateIndex]) {
+      state.usedDuplicates[duplicateIndex] = true;
+    }
+    if (type === '[object Object]') {
+      if (block && (Object.keys(state.dump).length !== 0)) {
+        writeBlockMapping(state, level, state.dump, compact);
+        if (duplicate) {
+          state.dump = '&ref_' + duplicateIndex + state.dump;
+        }
+      } else {
+        writeFlowMapping(state, level, state.dump);
+        if (duplicate) {
+          state.dump = '&ref_' + duplicateIndex + ' ' + state.dump;
+        }
+      }
+    } else if (type === '[object Array]') {
+      if (block && (state.dump.length !== 0)) {
+        writeBlockSequence(state, level, state.dump, compact);
+        if (duplicate) {
+          state.dump = '&ref_' + duplicateIndex + state.dump;
+        }
+      } else {
+        writeFlowSequence(state, level, state.dump);
+        if (duplicate) {
+          state.dump = '&ref_' + duplicateIndex + ' ' + state.dump;
+        }
+      }
+    } else if (type === '[object String]') {
+      if (state.tag !== '?') {
+        writeScalar(state, state.dump, level, iskey);
+      }
+    } else {
+      if (state.skipInvalid) return false;
+      throw new YAMLException('unacceptable kind of an object to dump ' + type);
+    }
+
+    if (state.tag !== null && state.tag !== '?') {
+      state.dump = '!<' + state.tag + '> ' + state.dump;
+    }
+  }
+
+  return true;
+}
+
+function getDuplicateReferences(object, state) {
+  var objects = [],
+      duplicatesIndexes = [],
+      index,
+      length;
+
+  inspectNode(object, objects, duplicatesIndexes);
+
+  for (index = 0, length = duplicatesIndexes.length; index < length; index += 1) {
+    state.duplicates.push(objects[duplicatesIndexes[index]]);
+  }
+  state.usedDuplicates = new Array(length);
+}
+
+function inspectNode(object, objects, duplicatesIndexes) {
+  var objectKeyList,
+      index,
+      length;
+
+  if (object !== null && typeof object === 'object') {
+    index = objects.indexOf(object);
+    if (index !== -1) {
+      if (duplicatesIndexes.indexOf(index) === -1) {
+        duplicatesIndexes.push(index);
+      }
+    } else {
+      objects.push(object);
+
+      if (Array.isArray(object)) {
+        for (index = 0, length = object.length; index < length; index += 1) {
+          inspectNode(object[index], objects, duplicatesIndexes);
+        }
+      } else {
+        objectKeyList = Object.keys(object);
+
+        for (index = 0, length = objectKeyList.length; index < length; index += 1) {
+          inspectNode(object[objectKeyList[index]], objects, duplicatesIndexes);
+        }
+      }
+    }
+  }
+}
+
+function dump(input, options) {
+  options = options || {};
+
+  var state = new State(options);
+
+  if (!state.noRefs) getDuplicateReferences(input, state);
+
+  if (writeNode(state, 0, input, true, true)) return state.dump + '\n';
+
+  return '';
+}
+
+function safeDump(input, options) {
+  return dump(input, common.extend({ schema: DEFAULT_SAFE_SCHEMA }, options));
+}
+
+module.exports.dump     = dump;
+module.exports.safeDump = safeDump;
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/exception.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/exception.js
new file mode 100644
index 00000000..cf4e6252
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/exception.js
@@ -0,0 +1,43 @@
+// YAML error class. http://stackoverflow.com/questions/8458984
+//
+'use strict';
+
+function YAMLException(reason, mark) {
+  // Super constructor
+  Error.call(this);
+
+  // Include stack trace in error object
+  if (Error.captureStackTrace) {
+    // Chrome and NodeJS
+    Error.captureStackTrace(this, this.constructor);
+  } else {
+    // FF, IE 10+ and Safari 6+. Fallback for others
+    this.stack = (new Error()).stack || '';
+  }
+
+  this.name = 'YAMLException';
+  this.reason = reason;
+  this.mark = mark;
+  this.message = (this.reason || '(unknown reason)') + (this.mark ? ' ' + this.mark.toString() : '');
+}
+
+
+// Inherit from Error
+YAMLException.prototype = Object.create(Error.prototype);
+YAMLException.prototype.constructor = YAMLException;
+
+
+YAMLException.prototype.toString = function toString(compact) {
+  var result = this.name + ': ';
+
+  result += this.reason || '(unknown reason)';
+
+  if (!compact && this.mark) {
+    result += ' ' + this.mark.toString();
+  }
+
+  return result;
+};
+
+
+module.exports = YAMLException;
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/loader.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/loader.js
new file mode 100644
index 00000000..70e1a565
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/loader.js
@@ -0,0 +1,1587 @@
+'use strict';
+
+/*eslint-disable max-len,no-use-before-define*/
+
+var common              = require('./common');
+var YAMLException       = require('./exception');
+var Mark                = require('./mark');
+var DEFAULT_SAFE_SCHEMA = require('./schema/default_safe');
+var DEFAULT_FULL_SCHEMA = require('./schema/default_full');
+
+
+var _hasOwnProperty = Object.prototype.hasOwnProperty;
+
+
+var CONTEXT_FLOW_IN   = 1;
+var CONTEXT_FLOW_OUT  = 2;
+var CONTEXT_BLOCK_IN  = 3;
+var CONTEXT_BLOCK_OUT = 4;
+
+
+var CHOMPING_CLIP  = 1;
+var CHOMPING_STRIP = 2;
+var CHOMPING_KEEP  = 3;
+
+
+var PATTERN_NON_PRINTABLE         = /[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x84\x86-\x9F\uFFFE\uFFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])|(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF]/;
+var PATTERN_NON_ASCII_LINE_BREAKS = /[\x85\u2028\u2029]/;
+var PATTERN_FLOW_INDICATORS       = /[,\[\]\{\}]/;
+var PATTERN_TAG_HANDLE            = /^(?:!|!!|![a-z\-]+!)$/i;
+var PATTERN_TAG_URI               = /^(?:!|[^,\[\]\{\}])(?:%[0-9a-f]{2}|[0-9a-z\-#;\/\?:@&=\+\$,_\.!~\*'\(\)\[\]])*$/i;
+
+
+function is_EOL(c) {
+  return (c === 0x0A/* LF */) || (c === 0x0D/* CR */);
+}
+
+function is_WHITE_SPACE(c) {
+  return (c === 0x09/* Tab */) || (c === 0x20/* Space */);
+}
+
+function is_WS_OR_EOL(c) {
+  return (c === 0x09/* Tab */) ||
+         (c === 0x20/* Space */) ||
+         (c === 0x0A/* LF */) ||
+         (c === 0x0D/* CR */);
+}
+
+function is_FLOW_INDICATOR(c) {
+  return c === 0x2C/* , */ ||
+         c === 0x5B/* [ */ ||
+         c === 0x5D/* ] */ ||
+         c === 0x7B/* { */ ||
+         c === 0x7D/* } */;
+}
+
+function fromHexCode(c) {
+  var lc;
+
+  if ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */)) {
+    return c - 0x30;
+  }
+
+  /*eslint-disable no-bitwise*/
+  lc = c | 0x20;
+
+  if ((0x61/* a */ <= lc) && (lc <= 0x66/* f */)) {
+    return lc - 0x61 + 10;
+  }
+
+  return -1;
+}
+
+function escapedHexLen(c) {
+  if (c === 0x78/* x */) { return 2; }
+  if (c === 0x75/* u */) { return 4; }
+  if (c === 0x55/* U */) { return 8; }
+  return 0;
+}
+
+function fromDecimalCode(c) {
+  if ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */)) {
+    return c - 0x30;
+  }
+
+  return -1;
+}
+
+function simpleEscapeSequence(c) {
+  return (c === 0x30/* 0 */) ? '\x00' :
+        (c === 0x61/* a */) ? '\x07' :
+        (c === 0x62/* b */) ? '\x08' :
+        (c === 0x74/* t */) ? '\x09' :
+        (c === 0x09/* Tab */) ? '\x09' :
+        (c === 0x6E/* n */) ? '\x0A' :
+        (c === 0x76/* v */) ? '\x0B' :
+        (c === 0x66/* f */) ? '\x0C' :
+        (c === 0x72/* r */) ? '\x0D' :
+        (c === 0x65/* e */) ? '\x1B' :
+        (c === 0x20/* Space */) ? ' ' :
+        (c === 0x22/* " */) ? '\x22' :
+        (c === 0x2F/* / */) ? '/' :
+        (c === 0x5C/* \ */) ? '\x5C' :
+        (c === 0x4E/* N */) ? '\x85' :
+        (c === 0x5F/* _ */) ? '\xA0' :
+        (c === 0x4C/* L */) ? '\u2028' :
+        (c === 0x50/* P */) ? '\u2029' : '';
+}
+
+function charFromCodepoint(c) {
+  if (c <= 0xFFFF) {
+    return String.fromCharCode(c);
+  }
+  // Encode UTF-16 surrogate pair
+  // https://en.wikipedia.org/wiki/UTF-16#Code_points_U.2B010000_to_U.2B10FFFF
+  return String.fromCharCode(((c - 0x010000) >> 10) + 0xD800,
+                             ((c - 0x010000) & 0x03FF) + 0xDC00);
+}
+
+var simpleEscapeCheck = new Array(256); // integer, for fast access
+var simpleEscapeMap = new Array(256);
+for (var i = 0; i < 256; i++) {
+  simpleEscapeCheck[i] = simpleEscapeSequence(i) ? 1 : 0;
+  simpleEscapeMap[i] = simpleEscapeSequence(i);
+}
+
+
+function State(input, options) {
+  this.input = input;
+
+  this.filename  = options['filename']  || null;
+  this.schema    = options['schema']    || DEFAULT_FULL_SCHEMA;
+  this.onWarning = options['onWarning'] || null;
+  this.legacy    = options['legacy']    || false;
+  this.json      = options['json']      || false;
+  this.listener  = options['listener']  || null;
+
+  this.implicitTypes = this.schema.compiledImplicit;
+  this.typeMap       = this.schema.compiledTypeMap;
+
+  this.length     = input.length;
+  this.position   = 0;
+  this.line       = 0;
+  this.lineStart  = 0;
+  this.lineIndent = 0;
+
+  this.documents = [];
+
+  /*
+  this.version;
+  this.checkLineBreaks;
+  this.tagMap;
+  this.anchorMap;
+  this.tag;
+  this.anchor;
+  this.kind;
+  this.result;*/
+
+}
+
+
+function generateError(state, message) {
+  return new YAMLException(
+    message,
+    new Mark(state.filename, state.input, state.position, state.line, (state.position - state.lineStart)));
+}
+
+function throwError(state, message) {
+  throw generateError(state, message);
+}
+
+function throwWarning(state, message) {
+  if (state.onWarning) {
+    state.onWarning.call(null, generateError(state, message));
+  }
+}
+
+
+var directiveHandlers = {
+
+  YAML: function handleYamlDirective(state, name, args) {
+
+    var match, major, minor;
+
+    if (state.version !== null) {
+      throwError(state, 'duplication of %YAML directive');
+    }
+
+    if (args.length !== 1) {
+      throwError(state, 'YAML directive accepts exactly one argument');
+    }
+
+    match = /^([0-9]+)\.([0-9]+)$/.exec(args[0]);
+
+    if (match === null) {
+      throwError(state, 'ill-formed argument of the YAML directive');
+    }
+
+    major = parseInt(match[1], 10);
+    minor = parseInt(match[2], 10);
+
+    if (major !== 1) {
+      throwError(state, 'unacceptable YAML version of the document');
+    }
+
+    state.version = args[0];
+    state.checkLineBreaks = (minor < 2);
+
+    if (minor !== 1 && minor !== 2) {
+      throwWarning(state, 'unsupported YAML version of the document');
+    }
+  },
+
+  TAG: function handleTagDirective(state, name, args) {
+
+    var handle, prefix;
+
+    if (args.length !== 2) {
+      throwError(state, 'TAG directive accepts exactly two arguments');
+    }
+
+    handle = args[0];
+    prefix = args[1];
+
+    if (!PATTERN_TAG_HANDLE.test(handle)) {
+      throwError(state, 'ill-formed tag handle (first argument) of the TAG directive');
+    }
+
+    if (_hasOwnProperty.call(state.tagMap, handle)) {
+      throwError(state, 'there is a previously declared suffix for "' + handle + '" tag handle');
+    }
+
+    if (!PATTERN_TAG_URI.test(prefix)) {
+      throwError(state, 'ill-formed tag prefix (second argument) of the TAG directive');
+    }
+
+    state.tagMap[handle] = prefix;
+  }
+};
+
+
+function captureSegment(state, start, end, checkJson) {
+  var _position, _length, _character, _result;
+
+  if (start < end) {
+    _result = state.input.slice(start, end);
+
+    if (checkJson) {
+      for (_position = 0, _length = _result.length;
+           _position < _length;
+           _position += 1) {
+        _character = _result.charCodeAt(_position);
+        if (!(_character === 0x09 ||
+              (0x20 <= _character && _character <= 0x10FFFF))) {
+          throwError(state, 'expected valid JSON character');
+        }
+      }
+    } else if (PATTERN_NON_PRINTABLE.test(_result)) {
+      throwError(state, 'the stream contains non-printable characters');
+    }
+
+    state.result += _result;
+  }
+}
+
+function mergeMappings(state, destination, source, overridableKeys) {
+  var sourceKeys, key, index, quantity;
+
+  if (!common.isObject(source)) {
+    throwError(state, 'cannot merge mappings; the provided source object is unacceptable');
+  }
+
+  sourceKeys = Object.keys(source);
+
+  for (index = 0, quantity = sourceKeys.length; index < quantity; index += 1) {
+    key = sourceKeys[index];
+
+    if (!_hasOwnProperty.call(destination, key)) {
+      destination[key] = source[key];
+      overridableKeys[key] = true;
+    }
+  }
+}
+
+function storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode) {
+  var index, quantity;
+
+  keyNode = String(keyNode);
+
+  if (_result === null) {
+    _result = {};
+  }
+
+  if (keyTag === 'tag:yaml.org,2002:merge') {
+    if (Array.isArray(valueNode)) {
+      for (index = 0, quantity = valueNode.length; index < quantity; index += 1) {
+        mergeMappings(state, _result, valueNode[index], overridableKeys);
+      }
+    } else {
+      mergeMappings(state, _result, valueNode, overridableKeys);
+    }
+  } else {
+    if (!state.json &&
+        !_hasOwnProperty.call(overridableKeys, keyNode) &&
+        _hasOwnProperty.call(_result, keyNode)) {
+      throwError(state, 'duplicated mapping key');
+    }
+    _result[keyNode] = valueNode;
+    delete overridableKeys[keyNode];
+  }
+
+  return _result;
+}
+
+function readLineBreak(state) {
+  var ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch === 0x0A/* LF */) {
+    state.position++;
+  } else if (ch === 0x0D/* CR */) {
+    state.position++;
+    if (state.input.charCodeAt(state.position) === 0x0A/* LF */) {
+      state.position++;
+    }
+  } else {
+    throwError(state, 'a line break is expected');
+  }
+
+  state.line += 1;
+  state.lineStart = state.position;
+}
+
+function skipSeparationSpace(state, allowComments, checkIndent) {
+  var lineBreaks = 0,
+      ch = state.input.charCodeAt(state.position);
+
+  while (ch !== 0) {
+    while (is_WHITE_SPACE(ch)) {
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    if (allowComments && ch === 0x23/* # */) {
+      do {
+        ch = state.input.charCodeAt(++state.position);
+      } while (ch !== 0x0A/* LF */ && ch !== 0x0D/* CR */ && ch !== 0);
+    }
+
+    if (is_EOL(ch)) {
+      readLineBreak(state);
+
+      ch = state.input.charCodeAt(state.position);
+      lineBreaks++;
+      state.lineIndent = 0;
+
+      while (ch === 0x20/* Space */) {
+        state.lineIndent++;
+        ch = state.input.charCodeAt(++state.position);
+      }
+    } else {
+      break;
+    }
+  }
+
+  if (checkIndent !== -1 && lineBreaks !== 0 && state.lineIndent < checkIndent) {
+    throwWarning(state, 'deficient indentation');
+  }
+
+  return lineBreaks;
+}
+
+function testDocumentSeparator(state) {
+  var _position = state.position,
+      ch;
+
+  ch = state.input.charCodeAt(_position);
+
+  // Condition state.position === state.lineStart is tested
+  // in parent on each call, for efficiency. No needs to test here again.
+  if ((ch === 0x2D/* - */ || ch === 0x2E/* . */) &&
+      ch === state.input.charCodeAt(_position + 1) &&
+      ch === state.input.charCodeAt(_position + 2)) {
+
+    _position += 3;
+
+    ch = state.input.charCodeAt(_position);
+
+    if (ch === 0 || is_WS_OR_EOL(ch)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+function writeFoldedLines(state, count) {
+  if (count === 1) {
+    state.result += ' ';
+  } else if (count > 1) {
+    state.result += common.repeat('\n', count - 1);
+  }
+}
+
+
+function readPlainScalar(state, nodeIndent, withinFlowCollection) {
+  var preceding,
+      following,
+      captureStart,
+      captureEnd,
+      hasPendingContent,
+      _line,
+      _lineStart,
+      _lineIndent,
+      _kind = state.kind,
+      _result = state.result,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (is_WS_OR_EOL(ch)      ||
+      is_FLOW_INDICATOR(ch) ||
+      ch === 0x23/* # */    ||
+      ch === 0x26/* & */    ||
+      ch === 0x2A/* * */    ||
+      ch === 0x21/* ! */    ||
+      ch === 0x7C/* | */    ||
+      ch === 0x3E/* > */    ||
+      ch === 0x27/* ' */    ||
+      ch === 0x22/* " */    ||
+      ch === 0x25/* % */    ||
+      ch === 0x40/* @ */    ||
+      ch === 0x60/* ` */) {
+    return false;
+  }
+
+  if (ch === 0x3F/* ? */ || ch === 0x2D/* - */) {
+    following = state.input.charCodeAt(state.position + 1);
+
+    if (is_WS_OR_EOL(following) ||
+        withinFlowCollection && is_FLOW_INDICATOR(following)) {
+      return false;
+    }
+  }
+
+  state.kind = 'scalar';
+  state.result = '';
+  captureStart = captureEnd = state.position;
+  hasPendingContent = false;
+
+  while (ch !== 0) {
+    if (ch === 0x3A/* : */) {
+      following = state.input.charCodeAt(state.position + 1);
+
+      if (is_WS_OR_EOL(following) ||
+          withinFlowCollection && is_FLOW_INDICATOR(following)) {
+        break;
+      }
+
+    } else if (ch === 0x23/* # */) {
+      preceding = state.input.charCodeAt(state.position - 1);
+
+      if (is_WS_OR_EOL(preceding)) {
+        break;
+      }
+
+    } else if ((state.position === state.lineStart && testDocumentSeparator(state)) ||
+               withinFlowCollection && is_FLOW_INDICATOR(ch)) {
+      break;
+
+    } else if (is_EOL(ch)) {
+      _line = state.line;
+      _lineStart = state.lineStart;
+      _lineIndent = state.lineIndent;
+      skipSeparationSpace(state, false, -1);
+
+      if (state.lineIndent >= nodeIndent) {
+        hasPendingContent = true;
+        ch = state.input.charCodeAt(state.position);
+        continue;
+      } else {
+        state.position = captureEnd;
+        state.line = _line;
+        state.lineStart = _lineStart;
+        state.lineIndent = _lineIndent;
+        break;
+      }
+    }
+
+    if (hasPendingContent) {
+      captureSegment(state, captureStart, captureEnd, false);
+      writeFoldedLines(state, state.line - _line);
+      captureStart = captureEnd = state.position;
+      hasPendingContent = false;
+    }
+
+    if (!is_WHITE_SPACE(ch)) {
+      captureEnd = state.position + 1;
+    }
+
+    ch = state.input.charCodeAt(++state.position);
+  }
+
+  captureSegment(state, captureStart, captureEnd, false);
+
+  if (state.result) {
+    return true;
+  }
+
+  state.kind = _kind;
+  state.result = _result;
+  return false;
+}
+
+function readSingleQuotedScalar(state, nodeIndent) {
+  var ch,
+      captureStart, captureEnd;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch !== 0x27/* ' */) {
+    return false;
+  }
+
+  state.kind = 'scalar';
+  state.result = '';
+  state.position++;
+  captureStart = captureEnd = state.position;
+
+  while ((ch = state.input.charCodeAt(state.position)) !== 0) {
+    if (ch === 0x27/* ' */) {
+      captureSegment(state, captureStart, state.position, true);
+      ch = state.input.charCodeAt(++state.position);
+
+      if (ch === 0x27/* ' */) {
+        captureStart = state.position;
+        state.position++;
+        captureEnd = state.position;
+      } else {
+        return true;
+      }
+
+    } else if (is_EOL(ch)) {
+      captureSegment(state, captureStart, captureEnd, true);
+      writeFoldedLines(state, skipSeparationSpace(state, false, nodeIndent));
+      captureStart = captureEnd = state.position;
+
+    } else if (state.position === state.lineStart && testDocumentSeparator(state)) {
+      throwError(state, 'unexpected end of the document within a single quoted scalar');
+
+    } else {
+      state.position++;
+      captureEnd = state.position;
+    }
+  }
+
+  throwError(state, 'unexpected end of the stream within a single quoted scalar');
+}
+
+function readDoubleQuotedScalar(state, nodeIndent) {
+  var captureStart,
+      captureEnd,
+      hexLength,
+      hexResult,
+      tmp,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch !== 0x22/* " */) {
+    return false;
+  }
+
+  state.kind = 'scalar';
+  state.result = '';
+  state.position++;
+  captureStart = captureEnd = state.position;
+
+  while ((ch = state.input.charCodeAt(state.position)) !== 0) {
+    if (ch === 0x22/* " */) {
+      captureSegment(state, captureStart, state.position, true);
+      state.position++;
+      return true;
+
+    } else if (ch === 0x5C/* \ */) {
+      captureSegment(state, captureStart, state.position, true);
+      ch = state.input.charCodeAt(++state.position);
+
+      if (is_EOL(ch)) {
+        skipSeparationSpace(state, false, nodeIndent);
+
+        // TODO: rework to inline fn with no type cast?
+      } else if (ch < 256 && simpleEscapeCheck[ch]) {
+        state.result += simpleEscapeMap[ch];
+        state.position++;
+
+      } else if ((tmp = escapedHexLen(ch)) > 0) {
+        hexLength = tmp;
+        hexResult = 0;
+
+        for (; hexLength > 0; hexLength--) {
+          ch = state.input.charCodeAt(++state.position);
+
+          if ((tmp = fromHexCode(ch)) >= 0) {
+            hexResult = (hexResult << 4) + tmp;
+
+          } else {
+            throwError(state, 'expected hexadecimal character');
+          }
+        }
+
+        state.result += charFromCodepoint(hexResult);
+
+        state.position++;
+
+      } else {
+        throwError(state, 'unknown escape sequence');
+      }
+
+      captureStart = captureEnd = state.position;
+
+    } else if (is_EOL(ch)) {
+      captureSegment(state, captureStart, captureEnd, true);
+      writeFoldedLines(state, skipSeparationSpace(state, false, nodeIndent));
+      captureStart = captureEnd = state.position;
+
+    } else if (state.position === state.lineStart && testDocumentSeparator(state)) {
+      throwError(state, 'unexpected end of the document within a double quoted scalar');
+
+    } else {
+      state.position++;
+      captureEnd = state.position;
+    }
+  }
+
+  throwError(state, 'unexpected end of the stream within a double quoted scalar');
+}
+
+function readFlowCollection(state, nodeIndent) {
+  var readNext = true,
+      _line,
+      _tag     = state.tag,
+      _result,
+      _anchor  = state.anchor,
+      following,
+      terminator,
+      isPair,
+      isExplicitPair,
+      isMapping,
+      overridableKeys = {},
+      keyNode,
+      keyTag,
+      valueNode,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch === 0x5B/* [ */) {
+    terminator = 0x5D;/* ] */
+    isMapping = false;
+    _result = [];
+  } else if (ch === 0x7B/* { */) {
+    terminator = 0x7D;/* } */
+    isMapping = true;
+    _result = {};
+  } else {
+    return false;
+  }
+
+  if (state.anchor !== null) {
+    state.anchorMap[state.anchor] = _result;
+  }
+
+  ch = state.input.charCodeAt(++state.position);
+
+  while (ch !== 0) {
+    skipSeparationSpace(state, true, nodeIndent);
+
+    ch = state.input.charCodeAt(state.position);
+
+    if (ch === terminator) {
+      state.position++;
+      state.tag = _tag;
+      state.anchor = _anchor;
+      state.kind = isMapping ? 'mapping' : 'sequence';
+      state.result = _result;
+      return true;
+    } else if (!readNext) {
+      throwError(state, 'missed comma between flow collection entries');
+    }
+
+    keyTag = keyNode = valueNode = null;
+    isPair = isExplicitPair = false;
+
+    if (ch === 0x3F/* ? */) {
+      following = state.input.charCodeAt(state.position + 1);
+
+      if (is_WS_OR_EOL(following)) {
+        isPair = isExplicitPair = true;
+        state.position++;
+        skipSeparationSpace(state, true, nodeIndent);
+      }
+    }
+
+    _line = state.line;
+    composeNode(state, nodeIndent, CONTEXT_FLOW_IN, false, true);
+    keyTag = state.tag;
+    keyNode = state.result;
+    skipSeparationSpace(state, true, nodeIndent);
+
+    ch = state.input.charCodeAt(state.position);
+
+    if ((isExplicitPair || state.line === _line) && ch === 0x3A/* : */) {
+      isPair = true;
+      ch = state.input.charCodeAt(++state.position);
+      skipSeparationSpace(state, true, nodeIndent);
+      composeNode(state, nodeIndent, CONTEXT_FLOW_IN, false, true);
+      valueNode = state.result;
+    }
+
+    if (isMapping) {
+      storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode);
+    } else if (isPair) {
+      _result.push(storeMappingPair(state, null, overridableKeys, keyTag, keyNode, valueNode));
+    } else {
+      _result.push(keyNode);
+    }
+
+    skipSeparationSpace(state, true, nodeIndent);
+
+    ch = state.input.charCodeAt(state.position);
+
+    if (ch === 0x2C/* , */) {
+      readNext = true;
+      ch = state.input.charCodeAt(++state.position);
+    } else {
+      readNext = false;
+    }
+  }
+
+  throwError(state, 'unexpected end of the stream within a flow collection');
+}
+
+function readBlockScalar(state, nodeIndent) {
+  var captureStart,
+      folding,
+      chomping       = CHOMPING_CLIP,
+      didReadContent = false,
+      detectedIndent = false,
+      textIndent     = nodeIndent,
+      emptyLines     = 0,
+      atMoreIndented = false,
+      tmp,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch === 0x7C/* | */) {
+    folding = false;
+  } else if (ch === 0x3E/* > */) {
+    folding = true;
+  } else {
+    return false;
+  }
+
+  state.kind = 'scalar';
+  state.result = '';
+
+  while (ch !== 0) {
+    ch = state.input.charCodeAt(++state.position);
+
+    if (ch === 0x2B/* + */ || ch === 0x2D/* - */) {
+      if (CHOMPING_CLIP === chomping) {
+        chomping = (ch === 0x2B/* + */) ? CHOMPING_KEEP : CHOMPING_STRIP;
+      } else {
+        throwError(state, 'repeat of a chomping mode identifier');
+      }
+
+    } else if ((tmp = fromDecimalCode(ch)) >= 0) {
+      if (tmp === 0) {
+        throwError(state, 'bad explicit indentation width of a block scalar; it cannot be less than one');
+      } else if (!detectedIndent) {
+        textIndent = nodeIndent + tmp - 1;
+        detectedIndent = true;
+      } else {
+        throwError(state, 'repeat of an indentation width identifier');
+      }
+
+    } else {
+      break;
+    }
+  }
+
+  if (is_WHITE_SPACE(ch)) {
+    do { ch = state.input.charCodeAt(++state.position); }
+    while (is_WHITE_SPACE(ch));
+
+    if (ch === 0x23/* # */) {
+      do { ch = state.input.charCodeAt(++state.position); }
+      while (!is_EOL(ch) && (ch !== 0));
+    }
+  }
+
+  while (ch !== 0) {
+    readLineBreak(state);
+    state.lineIndent = 0;
+
+    ch = state.input.charCodeAt(state.position);
+
+    while ((!detectedIndent || state.lineIndent < textIndent) &&
+           (ch === 0x20/* Space */)) {
+      state.lineIndent++;
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    if (!detectedIndent && state.lineIndent > textIndent) {
+      textIndent = state.lineIndent;
+    }
+
+    if (is_EOL(ch)) {
+      emptyLines++;
+      continue;
+    }
+
+    // End of the scalar.
+    if (state.lineIndent < textIndent) {
+
+      // Perform the chomping.
+      if (chomping === CHOMPING_KEEP) {
+        state.result += common.repeat('\n', didReadContent ? 1 + emptyLines : emptyLines);
+      } else if (chomping === CHOMPING_CLIP) {
+        if (didReadContent) { // i.e. only if the scalar is not empty.
+          state.result += '\n';
+        }
+      }
+
+      // Break this `while` cycle and go to the funciton's epilogue.
+      break;
+    }
+
+    // Folded style: use fancy rules to handle line breaks.
+    if (folding) {
+
+      // Lines starting with white space characters (more-indented lines) are not folded.
+      if (is_WHITE_SPACE(ch)) {
+        atMoreIndented = true;
+        // except for the first content line (cf. Example 8.1)
+        state.result += common.repeat('\n', didReadContent ? 1 + emptyLines : emptyLines);
+
+      // End of more-indented block.
+      } else if (atMoreIndented) {
+        atMoreIndented = false;
+        state.result += common.repeat('\n', emptyLines + 1);
+
+      // Just one line break - perceive as the same line.
+      } else if (emptyLines === 0) {
+        if (didReadContent) { // i.e. only if we have already read some scalar content.
+          state.result += ' ';
+        }
+
+      // Several line breaks - perceive as different lines.
+      } else {
+        state.result += common.repeat('\n', emptyLines);
+      }
+
+    // Literal style: just add exact number of line breaks between content lines.
+    } else {
+      // Keep all line breaks except the header line break.
+      state.result += common.repeat('\n', didReadContent ? 1 + emptyLines : emptyLines);
+    }
+
+    didReadContent = true;
+    detectedIndent = true;
+    emptyLines = 0;
+    captureStart = state.position;
+
+    while (!is_EOL(ch) && (ch !== 0)) {
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    captureSegment(state, captureStart, state.position, false);
+  }
+
+  return true;
+}
+
+function readBlockSequence(state, nodeIndent) {
+  var _line,
+      _tag      = state.tag,
+      _anchor   = state.anchor,
+      _result   = [],
+      following,
+      detected  = false,
+      ch;
+
+  if (state.anchor !== null) {
+    state.anchorMap[state.anchor] = _result;
+  }
+
+  ch = state.input.charCodeAt(state.position);
+
+  while (ch !== 0) {
+
+    if (ch !== 0x2D/* - */) {
+      break;
+    }
+
+    following = state.input.charCodeAt(state.position + 1);
+
+    if (!is_WS_OR_EOL(following)) {
+      break;
+    }
+
+    detected = true;
+    state.position++;
+
+    if (skipSeparationSpace(state, true, -1)) {
+      if (state.lineIndent <= nodeIndent) {
+        _result.push(null);
+        ch = state.input.charCodeAt(state.position);
+        continue;
+      }
+    }
+
+    _line = state.line;
+    composeNode(state, nodeIndent, CONTEXT_BLOCK_IN, false, true);
+    _result.push(state.result);
+    skipSeparationSpace(state, true, -1);
+
+    ch = state.input.charCodeAt(state.position);
+
+    if ((state.line === _line || state.lineIndent > nodeIndent) && (ch !== 0)) {
+      throwError(state, 'bad indentation of a sequence entry');
+    } else if (state.lineIndent < nodeIndent) {
+      break;
+    }
+  }
+
+  if (detected) {
+    state.tag = _tag;
+    state.anchor = _anchor;
+    state.kind = 'sequence';
+    state.result = _result;
+    return true;
+  }
+  return false;
+}
+
+function readBlockMapping(state, nodeIndent, flowIndent) {
+  var following,
+      allowCompact,
+      _line,
+      _tag          = state.tag,
+      _anchor       = state.anchor,
+      _result       = {},
+      overridableKeys = {},
+      keyTag        = null,
+      keyNode       = null,
+      valueNode     = null,
+      atExplicitKey = false,
+      detected      = false,
+      ch;
+
+  if (state.anchor !== null) {
+    state.anchorMap[state.anchor] = _result;
+  }
+
+  ch = state.input.charCodeAt(state.position);
+
+  while (ch !== 0) {
+    following = state.input.charCodeAt(state.position + 1);
+    _line = state.line; // Save the current line.
+
+    //
+    // Explicit notation case. There are two separate blocks:
+    // first for the key (denoted by "?") and second for the value (denoted by ":")
+    //
+    if ((ch === 0x3F/* ? */ || ch === 0x3A/* : */) && is_WS_OR_EOL(following)) {
+
+      if (ch === 0x3F/* ? */) {
+        if (atExplicitKey) {
+          storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null);
+          keyTag = keyNode = valueNode = null;
+        }
+
+        detected = true;
+        atExplicitKey = true;
+        allowCompact = true;
+
+      } else if (atExplicitKey) {
+        // i.e. 0x3A/* : */ === character after the explicit key.
+        atExplicitKey = false;
+        allowCompact = true;
+
+      } else {
+        throwError(state, 'incomplete explicit mapping pair; a key node is missed');
+      }
+
+      state.position += 1;
+      ch = following;
+
+    //
+    // Implicit notation case. Flow-style node as the key first, then ":", and the value.
+    //
+    } else if (composeNode(state, flowIndent, CONTEXT_FLOW_OUT, false, true)) {
+
+      if (state.line === _line) {
+        ch = state.input.charCodeAt(state.position);
+
+        while (is_WHITE_SPACE(ch)) {
+          ch = state.input.charCodeAt(++state.position);
+        }
+
+        if (ch === 0x3A/* : */) {
+          ch = state.input.charCodeAt(++state.position);
+
+          if (!is_WS_OR_EOL(ch)) {
+            throwError(state, 'a whitespace character is expected after the key-value separator within a block mapping');
+          }
+
+          if (atExplicitKey) {
+            storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null);
+            keyTag = keyNode = valueNode = null;
+          }
+
+          detected = true;
+          atExplicitKey = false;
+          allowCompact = false;
+          keyTag = state.tag;
+          keyNode = state.result;
+
+        } else if (detected) {
+          throwError(state, 'can not read an implicit mapping pair; a colon is missed');
+
+        } else {
+          state.tag = _tag;
+          state.anchor = _anchor;
+          return true; // Keep the result of `composeNode`.
+        }
+
+      } else if (detected) {
+        throwError(state, 'can not read a block mapping entry; a multiline key may not be an implicit key');
+
+      } else {
+        state.tag = _tag;
+        state.anchor = _anchor;
+        return true; // Keep the result of `composeNode`.
+      }
+
+    } else {
+      break; // Reading is done. Go to the epilogue.
+    }
+
+    //
+    // Common reading code for both explicit and implicit notations.
+    //
+    if (state.line === _line || state.lineIndent > nodeIndent) {
+      if (composeNode(state, nodeIndent, CONTEXT_BLOCK_OUT, true, allowCompact)) {
+        if (atExplicitKey) {
+          keyNode = state.result;
+        } else {
+          valueNode = state.result;
+        }
+      }
+
+      if (!atExplicitKey) {
+        storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode);
+        keyTag = keyNode = valueNode = null;
+      }
+
+      skipSeparationSpace(state, true, -1);
+      ch = state.input.charCodeAt(state.position);
+    }
+
+    if (state.lineIndent > nodeIndent && (ch !== 0)) {
+      throwError(state, 'bad indentation of a mapping entry');
+    } else if (state.lineIndent < nodeIndent) {
+      break;
+    }
+  }
+
+  //
+  // Epilogue.
+  //
+
+  // Special case: last mapping's node contains only the key in explicit notation.
+  if (atExplicitKey) {
+    storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null);
+  }
+
+  // Expose the resulting mapping.
+  if (detected) {
+    state.tag = _tag;
+    state.anchor = _anchor;
+    state.kind = 'mapping';
+    state.result = _result;
+  }
+
+  return detected;
+}
+
+function readTagProperty(state) {
+  var _position,
+      isVerbatim = false,
+      isNamed    = false,
+      tagHandle,
+      tagName,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch !== 0x21/* ! */) return false;
+
+  if (state.tag !== null) {
+    throwError(state, 'duplication of a tag property');
+  }
+
+  ch = state.input.charCodeAt(++state.position);
+
+  if (ch === 0x3C/* < */) {
+    isVerbatim = true;
+    ch = state.input.charCodeAt(++state.position);
+
+  } else if (ch === 0x21/* ! */) {
+    isNamed = true;
+    tagHandle = '!!';
+    ch = state.input.charCodeAt(++state.position);
+
+  } else {
+    tagHandle = '!';
+  }
+
+  _position = state.position;
+
+  if (isVerbatim) {
+    do { ch = state.input.charCodeAt(++state.position); }
+    while (ch !== 0 && ch !== 0x3E/* > */);
+
+    if (state.position < state.length) {
+      tagName = state.input.slice(_position, state.position);
+      ch = state.input.charCodeAt(++state.position);
+    } else {
+      throwError(state, 'unexpected end of the stream within a verbatim tag');
+    }
+  } else {
+    while (ch !== 0 && !is_WS_OR_EOL(ch)) {
+
+      if (ch === 0x21/* ! */) {
+        if (!isNamed) {
+          tagHandle = state.input.slice(_position - 1, state.position + 1);
+
+          if (!PATTERN_TAG_HANDLE.test(tagHandle)) {
+            throwError(state, 'named tag handle cannot contain such characters');
+          }
+
+          isNamed = true;
+          _position = state.position + 1;
+        } else {
+          throwError(state, 'tag suffix cannot contain exclamation marks');
+        }
+      }
+
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    tagName = state.input.slice(_position, state.position);
+
+    if (PATTERN_FLOW_INDICATORS.test(tagName)) {
+      throwError(state, 'tag suffix cannot contain flow indicator characters');
+    }
+  }
+
+  if (tagName && !PATTERN_TAG_URI.test(tagName)) {
+    throwError(state, 'tag name cannot contain such characters: ' + tagName);
+  }
+
+  if (isVerbatim) {
+    state.tag = tagName;
+
+  } else if (_hasOwnProperty.call(state.tagMap, tagHandle)) {
+    state.tag = state.tagMap[tagHandle] + tagName;
+
+  } else if (tagHandle === '!') {
+    state.tag = '!' + tagName;
+
+  } else if (tagHandle === '!!') {
+    state.tag = 'tag:yaml.org,2002:' + tagName;
+
+  } else {
+    throwError(state, 'undeclared tag handle "' + tagHandle + '"');
+  }
+
+  return true;
+}
+
+function readAnchorProperty(state) {
+  var _position,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch !== 0x26/* & */) return false;
+
+  if (state.anchor !== null) {
+    throwError(state, 'duplication of an anchor property');
+  }
+
+  ch = state.input.charCodeAt(++state.position);
+  _position = state.position;
+
+  while (ch !== 0 && !is_WS_OR_EOL(ch) && !is_FLOW_INDICATOR(ch)) {
+    ch = state.input.charCodeAt(++state.position);
+  }
+
+  if (state.position === _position) {
+    throwError(state, 'name of an anchor node must contain at least one character');
+  }
+
+  state.anchor = state.input.slice(_position, state.position);
+  return true;
+}
+
+function readAlias(state) {
+  var _position, alias,
+      ch;
+
+  ch = state.input.charCodeAt(state.position);
+
+  if (ch !== 0x2A/* * */) return false;
+
+  ch = state.input.charCodeAt(++state.position);
+  _position = state.position;
+
+  while (ch !== 0 && !is_WS_OR_EOL(ch) && !is_FLOW_INDICATOR(ch)) {
+    ch = state.input.charCodeAt(++state.position);
+  }
+
+  if (state.position === _position) {
+    throwError(state, 'name of an alias node must contain at least one character');
+  }
+
+  alias = state.input.slice(_position, state.position);
+
+  if (!state.anchorMap.hasOwnProperty(alias)) {
+    throwError(state, 'unidentified alias "' + alias + '"');
+  }
+
+  state.result = state.anchorMap[alias];
+  skipSeparationSpace(state, true, -1);
+  return true;
+}
+
+function composeNode(state, parentIndent, nodeContext, allowToSeek, allowCompact) {
+  var allowBlockStyles,
+      allowBlockScalars,
+      allowBlockCollections,
+      indentStatus = 1, // 1: this>parent, 0: this=parent, -1: this<parent
+      atNewLine  = false,
+      hasContent = false,
+      typeIndex,
+      typeQuantity,
+      type,
+      flowIndent,
+      blockIndent;
+
+  if (state.listener !== null) {
+    state.listener('open', state);
+  }
+
+  state.tag    = null;
+  state.anchor = null;
+  state.kind   = null;
+  state.result = null;
+
+  allowBlockStyles = allowBlockScalars = allowBlockCollections =
+    CONTEXT_BLOCK_OUT === nodeContext ||
+    CONTEXT_BLOCK_IN  === nodeContext;
+
+  if (allowToSeek) {
+    if (skipSeparationSpace(state, true, -1)) {
+      atNewLine = true;
+
+      if (state.lineIndent > parentIndent) {
+        indentStatus = 1;
+      } else if (state.lineIndent === parentIndent) {
+        indentStatus = 0;
+      } else if (state.lineIndent < parentIndent) {
+        indentStatus = -1;
+      }
+    }
+  }
+
+  if (indentStatus === 1) {
+    while (readTagProperty(state) || readAnchorProperty(state)) {
+      if (skipSeparationSpace(state, true, -1)) {
+        atNewLine = true;
+        allowBlockCollections = allowBlockStyles;
+
+        if (state.lineIndent > parentIndent) {
+          indentStatus = 1;
+        } else if (state.lineIndent === parentIndent) {
+          indentStatus = 0;
+        } else if (state.lineIndent < parentIndent) {
+          indentStatus = -1;
+        }
+      } else {
+        allowBlockCollections = false;
+      }
+    }
+  }
+
+  if (allowBlockCollections) {
+    allowBlockCollections = atNewLine || allowCompact;
+  }
+
+  if (indentStatus === 1 || CONTEXT_BLOCK_OUT === nodeContext) {
+    if (CONTEXT_FLOW_IN === nodeContext || CONTEXT_FLOW_OUT === nodeContext) {
+      flowIndent = parentIndent;
+    } else {
+      flowIndent = parentIndent + 1;
+    }
+
+    blockIndent = state.position - state.lineStart;
+
+    if (indentStatus === 1) {
+      if (allowBlockCollections &&
+          (readBlockSequence(state, blockIndent) ||
+           readBlockMapping(state, blockIndent, flowIndent)) ||
+          readFlowCollection(state, flowIndent)) {
+        hasContent = true;
+      } else {
+        if ((allowBlockScalars && readBlockScalar(state, flowIndent)) ||
+            readSingleQuotedScalar(state, flowIndent) ||
+            readDoubleQuotedScalar(state, flowIndent)) {
+          hasContent = true;
+
+        } else if (readAlias(state)) {
+          hasContent = true;
+
+          if (state.tag !== null || state.anchor !== null) {
+            throwError(state, 'alias node should not have any properties');
+          }
+
+        } else if (readPlainScalar(state, flowIndent, CONTEXT_FLOW_IN === nodeContext)) {
+          hasContent = true;
+
+          if (state.tag === null) {
+            state.tag = '?';
+          }
+        }
+
+        if (state.anchor !== null) {
+          state.anchorMap[state.anchor] = state.result;
+        }
+      }
+    } else if (indentStatus === 0) {
+      // Special case: block sequences are allowed to have same indentation level as the parent.
+      // http://www.yaml.org/spec/1.2/spec.html#id2799784
+      hasContent = allowBlockCollections && readBlockSequence(state, blockIndent);
+    }
+  }
+
+  if (state.tag !== null && state.tag !== '!') {
+    if (state.tag === '?') {
+      for (typeIndex = 0, typeQuantity = state.implicitTypes.length;
+           typeIndex < typeQuantity;
+           typeIndex += 1) {
+        type = state.implicitTypes[typeIndex];
+
+        // Implicit resolving is not allowed for non-scalar types, and '?'
+        // non-specific tag is only assigned to plain scalars. So, it isn't
+        // needed to check for 'kind' conformity.
+
+        if (type.resolve(state.result)) { // `state.result` updated in resolver if matched
+          state.result = type.construct(state.result);
+          state.tag = type.tag;
+          if (state.anchor !== null) {
+            state.anchorMap[state.anchor] = state.result;
+          }
+          break;
+        }
+      }
+    } else if (_hasOwnProperty.call(state.typeMap[state.kind || 'fallback'], state.tag)) {
+      type = state.typeMap[state.kind || 'fallback'][state.tag];
+
+      if (state.result !== null && type.kind !== state.kind) {
+        throwError(state, 'unacceptable node kind for !<' + state.tag + '> tag; it should be "' + type.kind + '", not "' + state.kind + '"');
+      }
+
+      if (!type.resolve(state.result)) { // `state.result` updated in resolver if matched
+        throwError(state, 'cannot resolve a node with !<' + state.tag + '> explicit tag');
+      } else {
+        state.result = type.construct(state.result);
+        if (state.anchor !== null) {
+          state.anchorMap[state.anchor] = state.result;
+        }
+      }
+    } else {
+      throwError(state, 'unknown tag !<' + state.tag + '>');
+    }
+  }
+
+  if (state.listener !== null) {
+    state.listener('close', state);
+  }
+  return state.tag !== null ||  state.anchor !== null || hasContent;
+}
+
+function readDocument(state) {
+  var documentStart = state.position,
+      _position,
+      directiveName,
+      directiveArgs,
+      hasDirectives = false,
+      ch;
+
+  state.version = null;
+  state.checkLineBreaks = state.legacy;
+  state.tagMap = {};
+  state.anchorMap = {};
+
+  while ((ch = state.input.charCodeAt(state.position)) !== 0) {
+    skipSeparationSpace(state, true, -1);
+
+    ch = state.input.charCodeAt(state.position);
+
+    if (state.lineIndent > 0 || ch !== 0x25/* % */) {
+      break;
+    }
+
+    hasDirectives = true;
+    ch = state.input.charCodeAt(++state.position);
+    _position = state.position;
+
+    while (ch !== 0 && !is_WS_OR_EOL(ch)) {
+      ch = state.input.charCodeAt(++state.position);
+    }
+
+    directiveName = state.input.slice(_position, state.position);
+    directiveArgs = [];
+
+    if (directiveName.length < 1) {
+      throwError(state, 'directive name must not be less than one character in length');
+    }
+
+    while (ch !== 0) {
+      while (is_WHITE_SPACE(ch)) {
+        ch = state.input.charCodeAt(++state.position);
+      }
+
+      if (ch === 0x23/* # */) {
+        do { ch = state.input.charCodeAt(++state.position); }
+        while (ch !== 0 && !is_EOL(ch));
+        break;
+      }
+
+      if (is_EOL(ch)) break;
+
+      _position = state.position;
+
+      while (ch !== 0 && !is_WS_OR_EOL(ch)) {
+        ch = state.input.charCodeAt(++state.position);
+      }
+
+      directiveArgs.push(state.input.slice(_position, state.position));
+    }
+
+    if (ch !== 0) readLineBreak(state);
+
+    if (_hasOwnProperty.call(directiveHandlers, directiveName)) {
+      directiveHandlers[directiveName](state, directiveName, directiveArgs);
+    } else {
+      throwWarning(state, 'unknown document directive "' + directiveName + '"');
+    }
+  }
+
+  skipSeparationSpace(state, true, -1);
+
+  if (state.lineIndent === 0 &&
+      state.input.charCodeAt(state.position)     === 0x2D/* - */ &&
+      state.input.charCodeAt(state.position + 1) === 0x2D/* - */ &&
+      state.input.charCodeAt(state.position + 2) === 0x2D/* - */) {
+    state.position += 3;
+    skipSeparationSpace(state, true, -1);
+
+  } else if (hasDirectives) {
+    throwError(state, 'directives end mark is expected');
+  }
+
+  composeNode(state, state.lineIndent - 1, CONTEXT_BLOCK_OUT, false, true);
+  skipSeparationSpace(state, true, -1);
+
+  if (state.checkLineBreaks &&
+      PATTERN_NON_ASCII_LINE_BREAKS.test(state.input.slice(documentStart, state.position))) {
+    throwWarning(state, 'non-ASCII line breaks are interpreted as content');
+  }
+
+  state.documents.push(state.result);
+
+  if (state.position === state.lineStart && testDocumentSeparator(state)) {
+
+    if (state.input.charCodeAt(state.position) === 0x2E/* . */) {
+      state.position += 3;
+      skipSeparationSpace(state, true, -1);
+    }
+    return;
+  }
+
+  if (state.position < (state.length - 1)) {
+    throwError(state, 'end of the stream or a document separator is expected');
+  } else {
+    return;
+  }
+}
+
+
+function loadDocuments(input, options) {
+  input = String(input);
+  options = options || {};
+
+  if (input.length !== 0) {
+
+    // Add tailing `\n` if not exists
+    if (input.charCodeAt(input.length - 1) !== 0x0A/* LF */ &&
+        input.charCodeAt(input.length - 1) !== 0x0D/* CR */) {
+      input += '\n';
+    }
+
+    // Strip BOM
+    if (input.charCodeAt(0) === 0xFEFF) {
+      input = input.slice(1);
+    }
+  }
+
+  var state = new State(input, options);
+
+  // Use 0 as string terminator. That significantly simplifies bounds check.
+  state.input += '\0';
+
+  while (state.input.charCodeAt(state.position) === 0x20/* Space */) {
+    state.lineIndent += 1;
+    state.position += 1;
+  }
+
+  while (state.position < (state.length - 1)) {
+    readDocument(state);
+  }
+
+  return state.documents;
+}
+
+
+function loadAll(input, iterator, options) {
+  var documents = loadDocuments(input, options), index, length;
+
+  for (index = 0, length = documents.length; index < length; index += 1) {
+    iterator(documents[index]);
+  }
+}
+
+
+function load(input, options) {
+  var documents = loadDocuments(input, options);
+
+  if (documents.length === 0) {
+    /*eslint-disable no-undefined*/
+    return undefined;
+  } else if (documents.length === 1) {
+    return documents[0];
+  }
+  throw new YAMLException('expected a single document in the stream, but found more');
+}
+
+
+function safeLoadAll(input, output, options) {
+  loadAll(input, output, common.extend({ schema: DEFAULT_SAFE_SCHEMA }, options));
+}
+
+
+function safeLoad(input, options) {
+  return load(input, common.extend({ schema: DEFAULT_SAFE_SCHEMA }, options));
+}
+
+
+module.exports.loadAll     = loadAll;
+module.exports.load        = load;
+module.exports.safeLoadAll = safeLoadAll;
+module.exports.safeLoad    = safeLoad;
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/mark.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/mark.js
new file mode 100644
index 00000000..47b265c2
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/mark.js
@@ -0,0 +1,76 @@
+'use strict';
+
+
+var common = require('./common');
+
+
+function Mark(name, buffer, position, line, column) {
+  this.name     = name;
+  this.buffer   = buffer;
+  this.position = position;
+  this.line     = line;
+  this.column   = column;
+}
+
+
+Mark.prototype.getSnippet = function getSnippet(indent, maxLength) {
+  var head, start, tail, end, snippet;
+
+  if (!this.buffer) return null;
+
+  indent = indent || 4;
+  maxLength = maxLength || 75;
+
+  head = '';
+  start = this.position;
+
+  while (start > 0 && '\x00\r\n\x85\u2028\u2029'.indexOf(this.buffer.charAt(start - 1)) === -1) {
+    start -= 1;
+    if (this.position - start > (maxLength / 2 - 1)) {
+      head = ' ... ';
+      start += 5;
+      break;
+    }
+  }
+
+  tail = '';
+  end = this.position;
+
+  while (end < this.buffer.length && '\x00\r\n\x85\u2028\u2029'.indexOf(this.buffer.charAt(end)) === -1) {
+    end += 1;
+    if (end - this.position > (maxLength / 2 - 1)) {
+      tail = ' ... ';
+      end -= 5;
+      break;
+    }
+  }
+
+  snippet = this.buffer.slice(start, end);
+
+  return common.repeat(' ', indent) + head + snippet + tail + '\n' +
+         common.repeat(' ', indent + this.position - start + head.length) + '^';
+};
+
+
+Mark.prototype.toString = function toString(compact) {
+  var snippet, where = '';
+
+  if (this.name) {
+    where += 'in "' + this.name + '" ';
+  }
+
+  where += 'at line ' + (this.line + 1) + ', column ' + (this.column + 1);
+
+  if (!compact) {
+    snippet = this.getSnippet();
+
+    if (snippet) {
+      where += ':\n' + snippet;
+    }
+  }
+
+  return where;
+};
+
+
+module.exports = Mark;
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema.js
new file mode 100644
index 00000000..ca7cf47e
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema.js
@@ -0,0 +1,108 @@
+'use strict';
+
+/*eslint-disable max-len*/
+
+var common        = require('./common');
+var YAMLException = require('./exception');
+var Type          = require('./type');
+
+
+function compileList(schema, name, result) {
+  var exclude = [];
+
+  schema.include.forEach(function (includedSchema) {
+    result = compileList(includedSchema, name, result);
+  });
+
+  schema[name].forEach(function (currentType) {
+    result.forEach(function (previousType, previousIndex) {
+      if (previousType.tag === currentType.tag && previousType.kind === currentType.kind) {
+        exclude.push(previousIndex);
+      }
+    });
+
+    result.push(currentType);
+  });
+
+  return result.filter(function (type, index) {
+    return exclude.indexOf(index) === -1;
+  });
+}
+
+
+function compileMap(/* lists... */) {
+  var result = {
+        scalar: {},
+        sequence: {},
+        mapping: {},
+        fallback: {}
+      }, index, length;
+
+  function collectType(type) {
+    result[type.kind][type.tag] = result['fallback'][type.tag] = type;
+  }
+
+  for (index = 0, length = arguments.length; index < length; index += 1) {
+    arguments[index].forEach(collectType);
+  }
+  return result;
+}
+
+
+function Schema(definition) {
+  this.include  = definition.include  || [];
+  this.implicit = definition.implicit || [];
+  this.explicit = definition.explicit || [];
+
+  this.implicit.forEach(function (type) {
+    if (type.loadKind && type.loadKind !== 'scalar') {
+      throw new YAMLException('There is a non-scalar type in the implicit list of a schema. Implicit resolving of such types is not supported.');
+    }
+  });
+
+  this.compiledImplicit = compileList(this, 'implicit', []);
+  this.compiledExplicit = compileList(this, 'explicit', []);
+  this.compiledTypeMap  = compileMap(this.compiledImplicit, this.compiledExplicit);
+}
+
+
+Schema.DEFAULT = null;
+
+
+Schema.create = function createSchema() {
+  var schemas, types;
+
+  switch (arguments.length) {
+    case 1:
+      schemas = Schema.DEFAULT;
+      types = arguments[0];
+      break;
+
+    case 2:
+      schemas = arguments[0];
+      types = arguments[1];
+      break;
+
+    default:
+      throw new YAMLException('Wrong number of arguments for Schema.create function');
+  }
+
+  schemas = common.toArray(schemas);
+  types = common.toArray(types);
+
+  if (!schemas.every(function (schema) { return schema instanceof Schema; })) {
+    throw new YAMLException('Specified list of super schemas (or a single Schema object) contains a non-Schema object.');
+  }
+
+  if (!types.every(function (type) { return type instanceof Type; })) {
+    throw new YAMLException('Specified list of YAML types (or a single Type object) contains a non-Type object.');
+  }
+
+  return new Schema({
+    include: schemas,
+    explicit: types
+  });
+};
+
+
+module.exports = Schema;
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema/core.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema/core.js
new file mode 100644
index 00000000..206daab5
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema/core.js
@@ -0,0 +1,18 @@
+// Standard YAML's Core schema.
+// http://www.yaml.org/spec/1.2/spec.html#id2804923
+//
+// NOTE: JS-YAML does not support schema-specific tag resolution restrictions.
+// So, Core schema has no distinctions from JSON schema is JS-YAML.
+
+
+'use strict';
+
+
+var Schema = require('../schema');
+
+
+module.exports = new Schema({
+  include: [
+    require('./json')
+  ]
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema/default_full.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema/default_full.js
new file mode 100644
index 00000000..a55ef42a
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema/default_full.js
@@ -0,0 +1,25 @@
+// JS-YAML's default schema for `load` function.
+// It is not described in the YAML specification.
+//
+// This schema is based on JS-YAML's default safe schema and includes
+// JavaScript-specific types: !!js/undefined, !!js/regexp and !!js/function.
+//
+// Also this schema is used as default base schema at `Schema.create` function.
+
+
+'use strict';
+
+
+var Schema = require('../schema');
+
+
+module.exports = Schema.DEFAULT = new Schema({
+  include: [
+    require('./default_safe')
+  ],
+  explicit: [
+    require('../type/js/undefined'),
+    require('../type/js/regexp'),
+    require('../type/js/function')
+  ]
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema/default_safe.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema/default_safe.js
new file mode 100644
index 00000000..11d89bbf
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema/default_safe.js
@@ -0,0 +1,28 @@
+// JS-YAML's default schema for `safeLoad` function.
+// It is not described in the YAML specification.
+//
+// This schema is based on standard YAML's Core schema and includes most of
+// extra types described at YAML tag repository. (http://yaml.org/type/)
+
+
+'use strict';
+
+
+var Schema = require('../schema');
+
+
+module.exports = new Schema({
+  include: [
+    require('./core')
+  ],
+  implicit: [
+    require('../type/timestamp'),
+    require('../type/merge')
+  ],
+  explicit: [
+    require('../type/binary'),
+    require('../type/omap'),
+    require('../type/pairs'),
+    require('../type/set')
+  ]
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema/failsafe.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema/failsafe.js
new file mode 100644
index 00000000..b7a33eb7
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema/failsafe.js
@@ -0,0 +1,17 @@
+// Standard YAML's Failsafe schema.
+// http://www.yaml.org/spec/1.2/spec.html#id2802346
+
+
+'use strict';
+
+
+var Schema = require('../schema');
+
+
+module.exports = new Schema({
+  explicit: [
+    require('../type/str'),
+    require('../type/seq'),
+    require('../type/map')
+  ]
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema/json.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema/json.js
new file mode 100644
index 00000000..5be3dbf8
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/schema/json.js
@@ -0,0 +1,25 @@
+// Standard YAML's JSON schema.
+// http://www.yaml.org/spec/1.2/spec.html#id2803231
+//
+// NOTE: JS-YAML does not support schema-specific tag resolution restrictions.
+// So, this schema is not such strict as defined in the YAML specification.
+// It allows numbers in binary notaion, use `Null` and `NULL` as `null`, etc.
+
+
+'use strict';
+
+
+var Schema = require('../schema');
+
+
+module.exports = new Schema({
+  include: [
+    require('./failsafe')
+  ],
+  implicit: [
+    require('../type/null'),
+    require('../type/bool'),
+    require('../type/int'),
+    require('../type/float')
+  ]
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type.js
new file mode 100644
index 00000000..90b702ac
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type.js
@@ -0,0 +1,61 @@
+'use strict';
+
+var YAMLException = require('./exception');
+
+var TYPE_CONSTRUCTOR_OPTIONS = [
+  'kind',
+  'resolve',
+  'construct',
+  'instanceOf',
+  'predicate',
+  'represent',
+  'defaultStyle',
+  'styleAliases'
+];
+
+var YAML_NODE_KINDS = [
+  'scalar',
+  'sequence',
+  'mapping'
+];
+
+function compileStyleAliases(map) {
+  var result = {};
+
+  if (map !== null) {
+    Object.keys(map).forEach(function (style) {
+      map[style].forEach(function (alias) {
+        result[String(alias)] = style;
+      });
+    });
+  }
+
+  return result;
+}
+
+function Type(tag, options) {
+  options = options || {};
+
+  Object.keys(options).forEach(function (name) {
+    if (TYPE_CONSTRUCTOR_OPTIONS.indexOf(name) === -1) {
+      throw new YAMLException('Unknown option "' + name + '" is met in definition of "' + tag + '" YAML type.');
+    }
+  });
+
+  // TODO: Add tag format check.
+  this.tag          = tag;
+  this.kind         = options['kind']         || null;
+  this.resolve      = options['resolve']      || function () { return true; };
+  this.construct    = options['construct']    || function (data) { return data; };
+  this.instanceOf   = options['instanceOf']   || null;
+  this.predicate    = options['predicate']    || null;
+  this.represent    = options['represent']    || null;
+  this.defaultStyle = options['defaultStyle'] || null;
+  this.styleAliases = compileStyleAliases(options['styleAliases'] || null);
+
+  if (YAML_NODE_KINDS.indexOf(this.kind) === -1) {
+    throw new YAMLException('Unknown kind "' + this.kind + '" is specified for "' + tag + '" YAML type.');
+  }
+}
+
+module.exports = Type;
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/binary.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/binary.js
new file mode 100644
index 00000000..205629f7
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/binary.js
@@ -0,0 +1,135 @@
+'use strict';
+
+/*eslint-disable no-bitwise*/
+
+var NodeBuffer;
+
+try {
+  // A trick for browserified version, to not include `Buffer` shim
+  var _require = require;
+  NodeBuffer = _require('buffer').Buffer;
+} catch (__) {}
+
+var Type       = require('../type');
+
+
+// [ 64, 65, 66 ] -> [ padding, CR, LF ]
+var BASE64_MAP = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n\r';
+
+
+function resolveYamlBinary(data) {
+  if (data === null) return false;
+
+  var code, idx, bitlen = 0, max = data.length, map = BASE64_MAP;
+
+  // Convert one by one.
+  for (idx = 0; idx < max; idx++) {
+    code = map.indexOf(data.charAt(idx));
+
+    // Skip CR/LF
+    if (code > 64) continue;
+
+    // Fail on illegal characters
+    if (code < 0) return false;
+
+    bitlen += 6;
+  }
+
+  // If there are any bits left, source was corrupted
+  return (bitlen % 8) === 0;
+}
+
+function constructYamlBinary(data) {
+  var idx, tailbits,
+      input = data.replace(/[\r\n=]/g, ''), // remove CR/LF & padding to simplify scan
+      max = input.length,
+      map = BASE64_MAP,
+      bits = 0,
+      result = [];
+
+  // Collect by 6*4 bits (3 bytes)
+
+  for (idx = 0; idx < max; idx++) {
+    if ((idx % 4 === 0) && idx) {
+      result.push((bits >> 16) & 0xFF);
+      result.push((bits >> 8) & 0xFF);
+      result.push(bits & 0xFF);
+    }
+
+    bits = (bits << 6) | map.indexOf(input.charAt(idx));
+  }
+
+  // Dump tail
+
+  tailbits = (max % 4) * 6;
+
+  if (tailbits === 0) {
+    result.push((bits >> 16) & 0xFF);
+    result.push((bits >> 8) & 0xFF);
+    result.push(bits & 0xFF);
+  } else if (tailbits === 18) {
+    result.push((bits >> 10) & 0xFF);
+    result.push((bits >> 2) & 0xFF);
+  } else if (tailbits === 12) {
+    result.push((bits >> 4) & 0xFF);
+  }
+
+  // Wrap into Buffer for NodeJS and leave Array for browser
+  if (NodeBuffer) return new NodeBuffer(result);
+
+  return result;
+}
+
+function representYamlBinary(object /*, style*/) {
+  var result = '', bits = 0, idx, tail,
+      max = object.length,
+      map = BASE64_MAP;
+
+  // Convert every three bytes to 4 ASCII characters.
+
+  for (idx = 0; idx < max; idx++) {
+    if ((idx % 3 === 0) && idx) {
+      result += map[(bits >> 18) & 0x3F];
+      result += map[(bits >> 12) & 0x3F];
+      result += map[(bits >> 6) & 0x3F];
+      result += map[bits & 0x3F];
+    }
+
+    bits = (bits << 8) + object[idx];
+  }
+
+  // Dump tail
+
+  tail = max % 3;
+
+  if (tail === 0) {
+    result += map[(bits >> 18) & 0x3F];
+    result += map[(bits >> 12) & 0x3F];
+    result += map[(bits >> 6) & 0x3F];
+    result += map[bits & 0x3F];
+  } else if (tail === 2) {
+    result += map[(bits >> 10) & 0x3F];
+    result += map[(bits >> 4) & 0x3F];
+    result += map[(bits << 2) & 0x3F];
+    result += map[64];
+  } else if (tail === 1) {
+    result += map[(bits >> 2) & 0x3F];
+    result += map[(bits << 4) & 0x3F];
+    result += map[64];
+    result += map[64];
+  }
+
+  return result;
+}
+
+function isBinary(object) {
+  return NodeBuffer && NodeBuffer.isBuffer(object);
+}
+
+module.exports = new Type('tag:yaml.org,2002:binary', {
+  kind: 'scalar',
+  resolve: resolveYamlBinary,
+  construct: constructYamlBinary,
+  predicate: isBinary,
+  represent: representYamlBinary
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/bool.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/bool.js
new file mode 100644
index 00000000..cb774593
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/bool.js
@@ -0,0 +1,35 @@
+'use strict';
+
+var Type = require('../type');
+
+function resolveYamlBoolean(data) {
+  if (data === null) return false;
+
+  var max = data.length;
+
+  return (max === 4 && (data === 'true' || data === 'True' || data === 'TRUE')) ||
+         (max === 5 && (data === 'false' || data === 'False' || data === 'FALSE'));
+}
+
+function constructYamlBoolean(data) {
+  return data === 'true' ||
+         data === 'True' ||
+         data === 'TRUE';
+}
+
+function isBoolean(object) {
+  return Object.prototype.toString.call(object) === '[object Boolean]';
+}
+
+module.exports = new Type('tag:yaml.org,2002:bool', {
+  kind: 'scalar',
+  resolve: resolveYamlBoolean,
+  construct: constructYamlBoolean,
+  predicate: isBoolean,
+  represent: {
+    lowercase: function (object) { return object ? 'true' : 'false'; },
+    uppercase: function (object) { return object ? 'TRUE' : 'FALSE'; },
+    camelcase: function (object) { return object ? 'True' : 'False'; }
+  },
+  defaultStyle: 'lowercase'
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/float.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/float.js
new file mode 100644
index 00000000..76871547
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/float.js
@@ -0,0 +1,105 @@
+'use strict';
+
+var common = require('../common');
+var Type   = require('../type');
+
+var YAML_FLOAT_PATTERN = new RegExp(
+  '^(?:[-+]?(?:[0-9][0-9_]*)\\.[0-9_]*(?:[eE][-+][0-9]+)?' +
+  '|\\.[0-9_]+(?:[eE][-+][0-9]+)?' +
+  '|[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+\\.[0-9_]*' +
+  '|[-+]?\\.(?:inf|Inf|INF)' +
+  '|\\.(?:nan|NaN|NAN))$');
+
+function resolveYamlFloat(data) {
+  if (data === null) return false;
+
+  if (!YAML_FLOAT_PATTERN.test(data)) return false;
+
+  return true;
+}
+
+function constructYamlFloat(data) {
+  var value, sign, base, digits;
+
+  value  = data.replace(/_/g, '').toLowerCase();
+  sign   = value[0] === '-' ? -1 : 1;
+  digits = [];
+
+  if ('+-'.indexOf(value[0]) >= 0) {
+    value = value.slice(1);
+  }
+
+  if (value === '.inf') {
+    return (sign === 1) ? Number.POSITIVE_INFINITY : Number.NEGATIVE_INFINITY;
+
+  } else if (value === '.nan') {
+    return NaN;
+
+  } else if (value.indexOf(':') >= 0) {
+    value.split(':').forEach(function (v) {
+      digits.unshift(parseFloat(v, 10));
+    });
+
+    value = 0.0;
+    base = 1;
+
+    digits.forEach(function (d) {
+      value += d * base;
+      base *= 60;
+    });
+
+    return sign * value;
+
+  }
+  return sign * parseFloat(value, 10);
+}
+
+
+var SCIENTIFIC_WITHOUT_DOT = /^[-+]?[0-9]+e/;
+
+function representYamlFloat(object, style) {
+  var res;
+
+  if (isNaN(object)) {
+    switch (style) {
+      case 'lowercase': return '.nan';
+      case 'uppercase': return '.NAN';
+      case 'camelcase': return '.NaN';
+    }
+  } else if (Number.POSITIVE_INFINITY === object) {
+    switch (style) {
+      case 'lowercase': return '.inf';
+      case 'uppercase': return '.INF';
+      case 'camelcase': return '.Inf';
+    }
+  } else if (Number.NEGATIVE_INFINITY === object) {
+    switch (style) {
+      case 'lowercase': return '-.inf';
+      case 'uppercase': return '-.INF';
+      case 'camelcase': return '-.Inf';
+    }
+  } else if (common.isNegativeZero(object)) {
+    return '-0.0';
+  }
+
+  res = object.toString(10);
+
+  // JS stringifier can build scientific format without dots: 5e-100,
+  // while YAML requres dot: 5.e-100. Fix it with simple hack
+
+  return SCIENTIFIC_WITHOUT_DOT.test(res) ? res.replace('e', '.e') : res;
+}
+
+function isFloat(object) {
+  return (Object.prototype.toString.call(object) === '[object Number]') &&
+         (object % 1 !== 0 || common.isNegativeZero(object));
+}
+
+module.exports = new Type('tag:yaml.org,2002:float', {
+  kind: 'scalar',
+  resolve: resolveYamlFloat,
+  construct: constructYamlFloat,
+  predicate: isFloat,
+  represent: representYamlFloat,
+  defaultStyle: 'lowercase'
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/int.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/int.js
new file mode 100644
index 00000000..a3c49650
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/int.js
@@ -0,0 +1,168 @@
+'use strict';
+
+var common = require('../common');
+var Type   = require('../type');
+
+function isHexCode(c) {
+  return ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */)) ||
+         ((0x41/* A */ <= c) && (c <= 0x46/* F */)) ||
+         ((0x61/* a */ <= c) && (c <= 0x66/* f */));
+}
+
+function isOctCode(c) {
+  return ((0x30/* 0 */ <= c) && (c <= 0x37/* 7 */));
+}
+
+function isDecCode(c) {
+  return ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */));
+}
+
+function resolveYamlInteger(data) {
+  if (data === null) return false;
+
+  var max = data.length,
+      index = 0,
+      hasDigits = false,
+      ch;
+
+  if (!max) return false;
+
+  ch = data[index];
+
+  // sign
+  if (ch === '-' || ch === '+') {
+    ch = data[++index];
+  }
+
+  if (ch === '0') {
+    // 0
+    if (index + 1 === max) return true;
+    ch = data[++index];
+
+    // base 2, base 8, base 16
+
+    if (ch === 'b') {
+      // base 2
+      index++;
+
+      for (; index < max; index++) {
+        ch = data[index];
+        if (ch === '_') continue;
+        if (ch !== '0' && ch !== '1') return false;
+        hasDigits = true;
+      }
+      return hasDigits;
+    }
+
+
+    if (ch === 'x') {
+      // base 16
+      index++;
+
+      for (; index < max; index++) {
+        ch = data[index];
+        if (ch === '_') continue;
+        if (!isHexCode(data.charCodeAt(index))) return false;
+        hasDigits = true;
+      }
+      return hasDigits;
+    }
+
+    // base 8
+    for (; index < max; index++) {
+      ch = data[index];
+      if (ch === '_') continue;
+      if (!isOctCode(data.charCodeAt(index))) return false;
+      hasDigits = true;
+    }
+    return hasDigits;
+  }
+
+  // base 10 (except 0) or base 60
+
+  for (; index < max; index++) {
+    ch = data[index];
+    if (ch === '_') continue;
+    if (ch === ':') break;
+    if (!isDecCode(data.charCodeAt(index))) {
+      return false;
+    }
+    hasDigits = true;
+  }
+
+  if (!hasDigits) return false;
+
+  // if !base60 - done;
+  if (ch !== ':') return true;
+
+  // base60 almost not used, no needs to optimize
+  return /^(:[0-5]?[0-9])+$/.test(data.slice(index));
+}
+
+function constructYamlInteger(data) {
+  var value = data, sign = 1, ch, base, digits = [];
+
+  if (value.indexOf('_') !== -1) {
+    value = value.replace(/_/g, '');
+  }
+
+  ch = value[0];
+
+  if (ch === '-' || ch === '+') {
+    if (ch === '-') sign = -1;
+    value = value.slice(1);
+    ch = value[0];
+  }
+
+  if (value === '0') return 0;
+
+  if (ch === '0') {
+    if (value[1] === 'b') return sign * parseInt(value.slice(2), 2);
+    if (value[1] === 'x') return sign * parseInt(value, 16);
+    return sign * parseInt(value, 8);
+  }
+
+  if (value.indexOf(':') !== -1) {
+    value.split(':').forEach(function (v) {
+      digits.unshift(parseInt(v, 10));
+    });
+
+    value = 0;
+    base = 1;
+
+    digits.forEach(function (d) {
+      value += (d * base);
+      base *= 60;
+    });
+
+    return sign * value;
+
+  }
+
+  return sign * parseInt(value, 10);
+}
+
+function isInteger(object) {
+  return (Object.prototype.toString.call(object)) === '[object Number]' &&
+         (object % 1 === 0 && !common.isNegativeZero(object));
+}
+
+module.exports = new Type('tag:yaml.org,2002:int', {
+  kind: 'scalar',
+  resolve: resolveYamlInteger,
+  construct: constructYamlInteger,
+  predicate: isInteger,
+  represent: {
+    binary:      function (object) { return '0b' + object.toString(2); },
+    octal:       function (object) { return '0'  + object.toString(8); },
+    decimal:     function (object) { return        object.toString(10); },
+    hexadecimal: function (object) { return '0x' + object.toString(16).toUpperCase(); }
+  },
+  defaultStyle: 'decimal',
+  styleAliases: {
+    binary:      [ 2,  'bin' ],
+    octal:       [ 8,  'oct' ],
+    decimal:     [ 10, 'dec' ],
+    hexadecimal: [ 16, 'hex' ]
+  }
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/js/function.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/js/function.js
new file mode 100644
index 00000000..c6a42d00
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/js/function.js
@@ -0,0 +1,84 @@
+'use strict';
+
+var esprima;
+
+// Browserified version does not have esprima
+//
+// 1. For node.js just require module as deps
+// 2. For browser try to require mudule via external AMD system.
+//    If not found - try to fallback to window.esprima. If not
+//    found too - then fail to parse.
+//
+try {
+  // workaround to exclude package from browserify list.
+  var _require = require;
+  esprima = _require('esprima');
+} catch (_) {
+  /*global window */
+  if (typeof window !== 'undefined') esprima = window.esprima;
+}
+
+var Type = require('../../type');
+
+function resolveJavascriptFunction(data) {
+  if (data === null) return false;
+
+  try {
+    var source = '(' + data + ')',
+        ast    = esprima.parse(source, { range: true });
+
+    if (ast.type                    !== 'Program'             ||
+        ast.body.length             !== 1                     ||
+        ast.body[0].type            !== 'ExpressionStatement' ||
+        ast.body[0].expression.type !== 'FunctionExpression') {
+      return false;
+    }
+
+    return true;
+  } catch (err) {
+    return false;
+  }
+}
+
+function constructJavascriptFunction(data) {
+  /*jslint evil:true*/
+
+  var source = '(' + data + ')',
+      ast    = esprima.parse(source, { range: true }),
+      params = [],
+      body;
+
+  if (ast.type                    !== 'Program'             ||
+      ast.body.length             !== 1                     ||
+      ast.body[0].type            !== 'ExpressionStatement' ||
+      ast.body[0].expression.type !== 'FunctionExpression') {
+    throw new Error('Failed to resolve function');
+  }
+
+  ast.body[0].expression.params.forEach(function (param) {
+    params.push(param.name);
+  });
+
+  body = ast.body[0].expression.body.range;
+
+  // Esprima's ranges include the first '{' and the last '}' characters on
+  // function expressions. So cut them out.
+  /*eslint-disable no-new-func*/
+  return new Function(params, source.slice(body[0] + 1, body[1] - 1));
+}
+
+function representJavascriptFunction(object /*, style*/) {
+  return object.toString();
+}
+
+function isFunction(object) {
+  return Object.prototype.toString.call(object) === '[object Function]';
+}
+
+module.exports = new Type('tag:yaml.org,2002:js/function', {
+  kind: 'scalar',
+  resolve: resolveJavascriptFunction,
+  construct: constructJavascriptFunction,
+  predicate: isFunction,
+  represent: representJavascriptFunction
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/js/regexp.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/js/regexp.js
new file mode 100644
index 00000000..43fa4701
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/js/regexp.js
@@ -0,0 +1,60 @@
+'use strict';
+
+var Type = require('../../type');
+
+function resolveJavascriptRegExp(data) {
+  if (data === null) return false;
+  if (data.length === 0) return false;
+
+  var regexp = data,
+      tail   = /\/([gim]*)$/.exec(data),
+      modifiers = '';
+
+  // if regexp starts with '/' it can have modifiers and must be properly closed
+  // `/foo/gim` - modifiers tail can be maximum 3 chars
+  if (regexp[0] === '/') {
+    if (tail) modifiers = tail[1];
+
+    if (modifiers.length > 3) return false;
+    // if expression starts with /, is should be properly terminated
+    if (regexp[regexp.length - modifiers.length - 1] !== '/') return false;
+  }
+
+  return true;
+}
+
+function constructJavascriptRegExp(data) {
+  var regexp = data,
+      tail   = /\/([gim]*)$/.exec(data),
+      modifiers = '';
+
+  // `/foo/gim` - tail can be maximum 4 chars
+  if (regexp[0] === '/') {
+    if (tail) modifiers = tail[1];
+    regexp = regexp.slice(1, regexp.length - modifiers.length - 1);
+  }
+
+  return new RegExp(regexp, modifiers);
+}
+
+function representJavascriptRegExp(object /*, style*/) {
+  var result = '/' + object.source + '/';
+
+  if (object.global) result += 'g';
+  if (object.multiline) result += 'm';
+  if (object.ignoreCase) result += 'i';
+
+  return result;
+}
+
+function isRegExp(object) {
+  return Object.prototype.toString.call(object) === '[object RegExp]';
+}
+
+module.exports = new Type('tag:yaml.org,2002:js/regexp', {
+  kind: 'scalar',
+  resolve: resolveJavascriptRegExp,
+  construct: constructJavascriptRegExp,
+  predicate: isRegExp,
+  represent: representJavascriptRegExp
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/js/undefined.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/js/undefined.js
new file mode 100644
index 00000000..95b5569f
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/js/undefined.js
@@ -0,0 +1,28 @@
+'use strict';
+
+var Type = require('../../type');
+
+function resolveJavascriptUndefined() {
+  return true;
+}
+
+function constructJavascriptUndefined() {
+  /*eslint-disable no-undefined*/
+  return undefined;
+}
+
+function representJavascriptUndefined() {
+  return '';
+}
+
+function isUndefined(object) {
+  return typeof object === 'undefined';
+}
+
+module.exports = new Type('tag:yaml.org,2002:js/undefined', {
+  kind: 'scalar',
+  resolve: resolveJavascriptUndefined,
+  construct: constructJavascriptUndefined,
+  predicate: isUndefined,
+  represent: representJavascriptUndefined
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/map.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/map.js
new file mode 100644
index 00000000..f327beeb
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/map.js
@@ -0,0 +1,8 @@
+'use strict';
+
+var Type = require('../type');
+
+module.exports = new Type('tag:yaml.org,2002:map', {
+  kind: 'mapping',
+  construct: function (data) { return data !== null ? data : {}; }
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/merge.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/merge.js
new file mode 100644
index 00000000..ae08a864
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/merge.js
@@ -0,0 +1,12 @@
+'use strict';
+
+var Type = require('../type');
+
+function resolveYamlMerge(data) {
+  return data === '<<' || data === null;
+}
+
+module.exports = new Type('tag:yaml.org,2002:merge', {
+  kind: 'scalar',
+  resolve: resolveYamlMerge
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/null.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/null.js
new file mode 100644
index 00000000..6874daa6
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/null.js
@@ -0,0 +1,34 @@
+'use strict';
+
+var Type = require('../type');
+
+function resolveYamlNull(data) {
+  if (data === null) return true;
+
+  var max = data.length;
+
+  return (max === 1 && data === '~') ||
+         (max === 4 && (data === 'null' || data === 'Null' || data === 'NULL'));
+}
+
+function constructYamlNull() {
+  return null;
+}
+
+function isNull(object) {
+  return object === null;
+}
+
+module.exports = new Type('tag:yaml.org,2002:null', {
+  kind: 'scalar',
+  resolve: resolveYamlNull,
+  construct: constructYamlNull,
+  predicate: isNull,
+  represent: {
+    canonical: function () { return '~';    },
+    lowercase: function () { return 'null'; },
+    uppercase: function () { return 'NULL'; },
+    camelcase: function () { return 'Null'; }
+  },
+  defaultStyle: 'lowercase'
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/omap.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/omap.js
new file mode 100644
index 00000000..b2b5323b
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/omap.js
@@ -0,0 +1,44 @@
+'use strict';
+
+var Type = require('../type');
+
+var _hasOwnProperty = Object.prototype.hasOwnProperty;
+var _toString       = Object.prototype.toString;
+
+function resolveYamlOmap(data) {
+  if (data === null) return true;
+
+  var objectKeys = [], index, length, pair, pairKey, pairHasKey,
+      object = data;
+
+  for (index = 0, length = object.length; index < length; index += 1) {
+    pair = object[index];
+    pairHasKey = false;
+
+    if (_toString.call(pair) !== '[object Object]') return false;
+
+    for (pairKey in pair) {
+      if (_hasOwnProperty.call(pair, pairKey)) {
+        if (!pairHasKey) pairHasKey = true;
+        else return false;
+      }
+    }
+
+    if (!pairHasKey) return false;
+
+    if (objectKeys.indexOf(pairKey) === -1) objectKeys.push(pairKey);
+    else return false;
+  }
+
+  return true;
+}
+
+function constructYamlOmap(data) {
+  return data !== null ? data : [];
+}
+
+module.exports = new Type('tag:yaml.org,2002:omap', {
+  kind: 'sequence',
+  resolve: resolveYamlOmap,
+  construct: constructYamlOmap
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/pairs.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/pairs.js
new file mode 100644
index 00000000..74b52403
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/pairs.js
@@ -0,0 +1,53 @@
+'use strict';
+
+var Type = require('../type');
+
+var _toString = Object.prototype.toString;
+
+function resolveYamlPairs(data) {
+  if (data === null) return true;
+
+  var index, length, pair, keys, result,
+      object = data;
+
+  result = new Array(object.length);
+
+  for (index = 0, length = object.length; index < length; index += 1) {
+    pair = object[index];
+
+    if (_toString.call(pair) !== '[object Object]') return false;
+
+    keys = Object.keys(pair);
+
+    if (keys.length !== 1) return false;
+
+    result[index] = [ keys[0], pair[keys[0]] ];
+  }
+
+  return true;
+}
+
+function constructYamlPairs(data) {
+  if (data === null) return [];
+
+  var index, length, pair, keys, result,
+      object = data;
+
+  result = new Array(object.length);
+
+  for (index = 0, length = object.length; index < length; index += 1) {
+    pair = object[index];
+
+    keys = Object.keys(pair);
+
+    result[index] = [ keys[0], pair[keys[0]] ];
+  }
+
+  return result;
+}
+
+module.exports = new Type('tag:yaml.org,2002:pairs', {
+  kind: 'sequence',
+  resolve: resolveYamlPairs,
+  construct: constructYamlPairs
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/seq.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/seq.js
new file mode 100644
index 00000000..be8f77f2
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/seq.js
@@ -0,0 +1,8 @@
+'use strict';
+
+var Type = require('../type');
+
+module.exports = new Type('tag:yaml.org,2002:seq', {
+  kind: 'sequence',
+  construct: function (data) { return data !== null ? data : []; }
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/set.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/set.js
new file mode 100644
index 00000000..f885a329
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/set.js
@@ -0,0 +1,29 @@
+'use strict';
+
+var Type = require('../type');
+
+var _hasOwnProperty = Object.prototype.hasOwnProperty;
+
+function resolveYamlSet(data) {
+  if (data === null) return true;
+
+  var key, object = data;
+
+  for (key in object) {
+    if (_hasOwnProperty.call(object, key)) {
+      if (object[key] !== null) return false;
+    }
+  }
+
+  return true;
+}
+
+function constructYamlSet(data) {
+  return data !== null ? data : {};
+}
+
+module.exports = new Type('tag:yaml.org,2002:set', {
+  kind: 'mapping',
+  resolve: resolveYamlSet,
+  construct: constructYamlSet
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/str.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/str.js
new file mode 100644
index 00000000..27acc106
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/str.js
@@ -0,0 +1,8 @@
+'use strict';
+
+var Type = require('../type');
+
+module.exports = new Type('tag:yaml.org,2002:str', {
+  kind: 'scalar',
+  construct: function (data) { return data !== null ? data : ''; }
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/timestamp.js b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/timestamp.js
new file mode 100644
index 00000000..8fa9c586
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/lib/js-yaml/type/timestamp.js
@@ -0,0 +1,88 @@
+'use strict';
+
+var Type = require('../type');
+
+var YAML_DATE_REGEXP = new RegExp(
+  '^([0-9][0-9][0-9][0-9])'          + // [1] year
+  '-([0-9][0-9])'                    + // [2] month
+  '-([0-9][0-9])$');                   // [3] day
+
+var YAML_TIMESTAMP_REGEXP = new RegExp(
+  '^([0-9][0-9][0-9][0-9])'          + // [1] year
+  '-([0-9][0-9]?)'                   + // [2] month
+  '-([0-9][0-9]?)'                   + // [3] day
+  '(?:[Tt]|[ \\t]+)'                 + // ...
+  '([0-9][0-9]?)'                    + // [4] hour
+  ':([0-9][0-9])'                    + // [5] minute
+  ':([0-9][0-9])'                    + // [6] second
+  '(?:\\.([0-9]*))?'                 + // [7] fraction
+  '(?:[ \\t]*(Z|([-+])([0-9][0-9]?)' + // [8] tz [9] tz_sign [10] tz_hour
+  '(?::([0-9][0-9]))?))?$');           // [11] tz_minute
+
+function resolveYamlTimestamp(data) {
+  if (data === null) return false;
+  if (YAML_DATE_REGEXP.exec(data) !== null) return true;
+  if (YAML_TIMESTAMP_REGEXP.exec(data) !== null) return true;
+  return false;
+}
+
+function constructYamlTimestamp(data) {
+  var match, year, month, day, hour, minute, second, fraction = 0,
+      delta = null, tz_hour, tz_minute, date;
+
+  match = YAML_DATE_REGEXP.exec(data);
+  if (match === null) match = YAML_TIMESTAMP_REGEXP.exec(data);
+
+  if (match === null) throw new Error('Date resolve error');
+
+  // match: [1] year [2] month [3] day
+
+  year = +(match[1]);
+  month = +(match[2]) - 1; // JS month starts with 0
+  day = +(match[3]);
+
+  if (!match[4]) { // no hour
+    return new Date(Date.UTC(year, month, day));
+  }
+
+  // match: [4] hour [5] minute [6] second [7] fraction
+
+  hour = +(match[4]);
+  minute = +(match[5]);
+  second = +(match[6]);
+
+  if (match[7]) {
+    fraction = match[7].slice(0, 3);
+    while (fraction.length < 3) { // milli-seconds
+      fraction += '0';
+    }
+    fraction = +fraction;
+  }
+
+  // match: [8] tz [9] tz_sign [10] tz_hour [11] tz_minute
+
+  if (match[9]) {
+    tz_hour = +(match[10]);
+    tz_minute = +(match[11] || 0);
+    delta = (tz_hour * 60 + tz_minute) * 60000; // delta in mili-seconds
+    if (match[9] === '-') delta = -delta;
+  }
+
+  date = new Date(Date.UTC(year, month, day, hour, minute, second, fraction));
+
+  if (delta) date.setTime(date.getTime() - delta);
+
+  return date;
+}
+
+function representYamlTimestamp(object /*, style*/) {
+  return object.toISOString();
+}
+
+module.exports = new Type('tag:yaml.org,2002:timestamp', {
+  kind: 'scalar',
+  resolve: resolveYamlTimestamp,
+  construct: constructYamlTimestamp,
+  instanceOf: Date,
+  represent: representYamlTimestamp
+});
diff --git a/node_modules/svgo/node_modules/js-yaml/node_modules/.bin/esparse b/node_modules/svgo/node_modules/js-yaml/node_modules/.bin/esparse
new file mode 120000
index 00000000..d3e4b572
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/node_modules/.bin/esparse
@@ -0,0 +1 @@
+../../../esprima/bin/esparse.js
\ No newline at end of file
diff --git a/node_modules/svgo/node_modules/js-yaml/node_modules/.bin/esvalidate b/node_modules/svgo/node_modules/js-yaml/node_modules/.bin/esvalidate
new file mode 120000
index 00000000..f8ef4b99
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/node_modules/.bin/esvalidate
@@ -0,0 +1 @@
+../../../esprima/bin/esvalidate.js
\ No newline at end of file
diff --git a/node_modules/svgo/node_modules/js-yaml/package.json b/node_modules/svgo/node_modules/js-yaml/package.json
new file mode 100644
index 00000000..1c6deb19
--- /dev/null
+++ b/node_modules/svgo/node_modules/js-yaml/package.json
@@ -0,0 +1,46 @@
+{
+  "name": "js-yaml",
+  "version": "3.7.0",
+  "description": "YAML 1.2 parser and serializer",
+  "keywords": [
+    "yaml",
+    "parser",
+    "serializer",
+    "pyyaml"
+  ],
+  "homepage": "https://github.com/nodeca/js-yaml",
+  "author": "Vladimir Zapparov <dervus.grim@gmail.com>",
+  "contributors": [
+    "Aleksey V Zapparov <ixti@member.fsf.org> (http://www.ixti.net/)",
+    "Vitaly Puzrin <vitaly@rcdesign.ru> (https://github.com/puzrin)",
+    "Martin Grenfell <martin.grenfell@gmail.com> (http://got-ravings.blogspot.com)"
+  ],
+  "license": "MIT",
+  "repository": "nodeca/js-yaml",
+  "files": [
+    "index.js",
+    "lib/",
+    "bin/",
+    "dist/"
+  ],
+  "bin": {
+    "js-yaml": "bin/js-yaml.js"
+  },
+  "dependencies": {
+    "argparse": "^1.0.7",
+    "esprima": "^2.6.0"
+  },
+  "devDependencies": {
+    "ansi": "*",
+    "benchmark": "*",
+    "browserify": "^13.0.0",
+    "codemirror": "^5.13.4",
+    "eslint": "^2.8.0",
+    "istanbul": "*",
+    "mocha": "*",
+    "uglify-js": "^2.6.1"
+  },
+  "scripts": {
+    "test": "make test"
+  }
+}
diff --git a/node_modules/svgo/package.json b/node_modules/svgo/package.json
new file mode 100644
index 00000000..be1eee49
--- /dev/null
+++ b/node_modules/svgo/package.json
@@ -0,0 +1,70 @@
+{
+  "name": "svgo",
+  "version": "0.7.2",
+  "description": "Nodejs-based tool for optimizing SVG vector graphics files",
+  "keywords": [
+    "svgo",
+    "svg",
+    "optimize",
+    "minify"
+  ],
+  "homepage": "https://github.com/svg/svgo",
+  "bugs": {
+    "url": "https://github.com/svg/svgo/issues",
+    "email": "kir@soulshine.in"
+  },
+  "author": {
+    "name": "Kir Belevich",
+    "email": "kir@soulshine.in",
+    "url": "https://github.com/deepsweet"
+  },
+  "contributors": [
+    {
+      "name": "Sergey Belov",
+      "email": "peimei@ya.ru",
+      "url": "http://github.com/arikon"
+    },
+    {
+      "name": "Lev Solntsev",
+      "email": "lev.sun@ya.ru",
+      "url": "http://github.com/GreLI"
+    }
+  ],
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/svg/svgo.git"
+  },
+  "main": "./lib/svgo.js",
+  "bin": {
+    "svgo": "./bin/svgo"
+  },
+  "directories": {
+    "bin": "./bin",
+    "lib": "./lib",
+    "example": "./examples"
+  },
+  "scripts": {
+    "test": "set NODE_ENV=test && mocha",
+    "jshint": "jshint --show-non-errors ."
+  },
+  "dependencies": {
+    "sax": "~1.2.1",
+    "coa": "~1.0.1",
+    "js-yaml": "~3.7.0",
+    "colors": "~1.1.2",
+    "whet.extend": "~0.9.9",
+    "mkdirp": "~0.5.1",
+    "csso": "~2.3.1"
+  },
+  "devDependencies": {
+    "mocha": "~3.2.0",
+    "should": "11.2.0",
+    "istanbul": "~0.4.5",
+    "mocha-istanbul": "~0.3.0",
+    "coveralls": "~2.11.14"
+  },
+  "engines": {
+    "node": ">=0.10.0"
+  },
+  "license": "MIT"
+}
diff --git a/node_modules/svgo/plugins/_collections.js b/node_modules/svgo/plugins/_collections.js
new file mode 100644
index 00000000..8ff3d1fb
--- /dev/null
+++ b/node_modules/svgo/plugins/_collections.js
@@ -0,0 +1,2529 @@
+'use strict';
+
+// http://www.w3.org/TR/SVG/intro.html#Definitions
+exports.elemsGroups = {
+    animation: ['animate', 'animateColor', 'animateMotion', 'animateTransform', 'set'],
+    descriptive: ['desc', 'metadata', 'title'],
+    shape: ['circle', 'ellipse', 'line', 'path', 'polygon', 'polyline', 'rect'],
+    structural: ['defs', 'g', 'svg', 'symbol', 'use'],
+    paintServer: ['solidColor', 'linearGradient', 'radialGradient', 'meshGradient', 'pattern', 'hatch'],
+    nonRendering: ['linearGradient', 'radialGradient', 'pattern', 'clipPath', 'mask', 'marker', 'symbol', 'filter', 'solidColor'],
+    container: ['a', 'defs', 'g', 'marker', 'mask', 'missing-glyph', 'pattern', 'svg', 'switch', 'symbol', 'foreignObject'],
+    textContent: ['altGlyph', 'altGlyphDef', 'altGlyphItem', 'glyph', 'glyphRef', 'textPath', 'text', 'tref', 'tspan'],
+    textContentChild: ['altGlyph', 'textPath', 'tref', 'tspan'],
+    lightSource: ['feDiffuseLighting', 'feSpecularLighting', 'feDistantLight', 'fePointLight', 'feSpotLight'],
+    filterPrimitive: ['feBlend', 'feColorMatrix', 'feComponentTransfer', 'feComposite', 'feConvolveMatrix', 'feDiffuseLighting', 'feDisplacementMap', 'feFlood', 'feGaussianBlur', 'feImage', 'feMerge', 'feMorphology', 'feOffset', 'feSpecularLighting', 'feTile', 'feTurbulence']
+};
+
+exports.pathElems = ['path', 'glyph', 'missing-glyph'];
+
+// http://www.w3.org/TR/SVG/intro.html#Definitions
+exports.attrsGroups = {
+    animationAddition: ['additive', 'accumulate'],
+    animationAttributeTarget: ['attributeType', 'attributeName'],
+    animationEvent: ['onbegin', 'onend', 'onrepeat', 'onload'],
+    animationTiming: ['begin', 'dur', 'end', 'min', 'max', 'restart', 'repeatCount', 'repeatDur', 'fill'],
+    animationValue: ['calcMode', 'values', 'keyTimes', 'keySplines', 'from', 'to', 'by'],
+    conditionalProcessing: ['requiredFeatures', 'requiredExtensions', 'systemLanguage'],
+    core: ['id', 'tabindex', 'xml:base', 'xml:lang', 'xml:space'],
+    graphicalEvent: ['onfocusin', 'onfocusout', 'onactivate', 'onclick', 'onmousedown', 'onmouseup', 'onmouseover', 'onmousemove', 'onmouseout', 'onload'],
+    presentation: [
+        'alignment-baseline',
+        'baseline-shift',
+        'buffered-rendering',
+        'clip',
+        'clip-path',
+        'clip-rule',
+        'color',
+        'color-interpolation',
+        'color-interpolation-filters',
+        'color-profile',
+        'color-rendering',
+        'cursor',
+        'direction',
+        'display',
+        'dominant-baseline',
+        'enable-background',
+        'fill',
+        'fill-opacity',
+        'fill-rule',
+        'filter',
+        'flood-color',
+        'flood-opacity',
+        'font-family',
+        'font-size',
+        'font-size-adjust',
+        'font-stretch',
+        'font-style',
+        'font-variant',
+        'font-weight',
+        'glyph-orientation-horizontal',
+        'glyph-orientation-vertical',
+        'image-rendering',
+        'kerning',
+        'letter-spacing',
+        'lighting-color',
+        'marker-end',
+        'marker-mid',
+        'marker-start',
+        'mask',
+        'opacity',
+        'overflow',
+        'pointer-events',
+        'shape-rendering',
+        'solid-color',
+        'solid-opacity',
+        'stop-color',
+        'stop-opacity',
+        'stroke',
+        'stroke-dasharray',
+        'stroke-dashoffset',
+        'stroke-linecap',
+        'stroke-linejoin',
+        'stroke-miterlimit',
+        'stroke-opacity',
+        'stroke-width',
+        'paint-order',
+        'text-anchor',
+        'text-decoration',
+        'text-overflow',
+        'white-space',
+        'text-rendering',
+        'unicode-bidi',
+        'vector-effect',
+        'viewport-fill',
+        'viewport-fill-opacity',
+        'visibility',
+        'white-space',
+        'word-spacing',
+        'writing-mode'
+    ],
+    xlink: ['xlink:href', 'xlink:show', 'xlink:actuate', 'xlink:type', 'xlink:role', 'xlink:arcrole', 'xlink:title'],
+    documentEvent: ['onunload', 'onabort', 'onerror', 'onresize', 'onscroll', 'onzoom'],
+    filterPrimitive: ['x', 'y', 'width', 'height', 'result'],
+    transferFunction: ['type', 'tableValues', 'slope', 'intercept', 'amplitude', 'exponent', 'offset']
+};
+
+exports.attrsGroupsDefaults = {
+    core: {'xml:space': 'preserve'},
+    filterPrimitive: {x: '0', y: '0', width: '100%', height: '100%'},
+    presentation: {
+        clip: 'auto',
+        'clip-path': 'none',
+        'clip-rule': 'nonzero',
+        mask: 'none',
+        opacity: '1',
+        'solid-color': '#000',
+        'solid-opacity': '1',
+        'stop-color': '#000',
+        'stop-opacity': '1',
+        'fill-opacity': '1',
+        'fill-rule': 'nonzero',
+        fill: '#000',
+        stroke: 'none',
+        'stroke-width': '1',
+        'stroke-linecap': 'butt',
+        'stroke-linejoin': 'miter',
+        'stroke-miterlimit': '4',
+        'stroke-dasharray': 'none',
+        'stroke-dashoffset': '0',
+        'stroke-opacity': '1',
+        'paint-order': 'normal',
+        'vector-effect': 'none',
+        'viewport-fill': 'none',
+        'viewport-fill-opacity': '1',
+        display: 'inline',
+        visibility: 'visible',
+        'marker-start': 'none',
+        'marker-mid': 'none',
+        'marker-end': 'none',
+        'color-interpolation': 'sRGB',
+        'color-interpolation-filters': 'linearRGB',
+        'color-rendering': 'auto',
+        'shape-rendering': 'auto',
+        'text-rendering': 'auto',
+        'image-rendering': 'auto',
+        'buffered-rendering': 'auto',
+        'font-style': 'normal',
+        'font-variant': 'normal',
+        'font-weight': 'normal',
+        'font-stretch': 'normal',
+        'font-size': 'medium',
+        'font-size-adjust': 'none',
+        kerning: 'auto',
+        'letter-spacing': 'normal',
+        'word-spacing': 'normal',
+        'text-decoration': 'none',
+        'text-anchor': 'start',
+        'text-overflow': 'clip',
+        'writing-mode': 'lr-tb',
+        'glyph-orientation-vertical': 'auto',
+        'glyph-orientation-horizontal': '0deg',
+        direction: 'ltr',
+        'unicode-bidi': 'normal',
+        'dominant-baseline': 'auto',
+        'alignment-baseline': 'baseline',
+        'baseline-shift': 'baseline'
+    },
+    transferFunction: {slope: '1', intercept: '0', amplitude: '1', exponent: '1', offset: '0'}
+};
+
+// http://www.w3.org/TR/SVG/eltindex.html
+exports.elems = {
+    a: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'graphicalEvent',
+            'presentation',
+            'xlink'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'transform',
+            'target'
+        ],
+        defaults: {
+            target: '_self'
+        },
+        contentGroups: [
+            'animation',
+            'descriptive',
+            'shape',
+            'structural',
+            'paintServer'
+        ],
+        content: [
+            'a',
+            'altGlyphDef',
+            'clipPath',
+            'color-profile',
+            'cursor',
+            'filter',
+            'font',
+            'font-face',
+            'foreignObject',
+            'image',
+            'marker',
+            'mask',
+            'pattern',
+            'script',
+            'style',
+            'switch',
+            'text',
+            'view'
+        ]
+    },
+    altGlyph: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'graphicalEvent',
+            'presentation',
+            'xlink'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'x',
+            'y',
+            'dx',
+            'dy',
+            'glyphRef',
+            'format',
+            'rotate'
+        ]
+    },
+    altGlyphDef: {
+        attrsGroups: [
+            'core'
+        ],
+        content: [
+            'glyphRef'
+        ]
+    },
+    altGlyphItem: {
+        attrsGroups: [
+            'core'
+        ],
+        content: [
+            'glyphRef',
+            'altGlyphItem'
+        ]
+    },
+    animate: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'animationAddition',
+            'animationAttributeTarget',
+            'animationEvent',
+            'animationTiming',
+            'animationValue',
+            'presentation',
+            'xlink'
+        ],
+        attrs: [
+            'externalResourcesRequired'
+        ],
+        contentGroups: [
+            'descriptive'
+        ]
+    },
+    animateColor: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'animationEvent',
+            'xlink',
+            'animationAttributeTarget',
+            'animationTiming',
+            'animationValue',
+            'animationAddition',
+            'presentation'
+        ],
+        attrs: [
+            'externalResourcesRequired'
+        ],
+        contentGroups: [
+            'descriptive'
+        ]
+    },
+    animateMotion: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'animationEvent',
+            'xlink',
+            'animationTiming',
+            'animationValue',
+            'animationAddition'
+        ],
+        attrs: [
+            'externalResourcesRequired',
+            'path',
+            'keyPoints',
+            'rotate',
+            'origin'
+        ],
+        defaults: {
+            'rotate': '0'
+        },
+        contentGroups: [
+            'descriptive'
+        ],
+        content: [
+            'mpath'
+        ]
+    },
+    animateTransform: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'animationEvent',
+            'xlink',
+            'animationAttributeTarget',
+            'animationTiming',
+            'animationValue',
+            'animationAddition'
+        ],
+        attrs: [
+            'externalResourcesRequired',
+            'type'
+        ],
+        contentGroups: [
+            'descriptive'
+        ]
+    },
+    circle: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'graphicalEvent',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'transform',
+            'cx',
+            'cy',
+            'r'
+        ],
+        defaults: {
+            cx: '0',
+            cy: '0'
+        },
+        contentGroups: [
+            'animation',
+            'descriptive'
+        ]
+    },
+    clipPath: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'transform',
+            'clipPathUnits'
+        ],
+        defaults: {
+            clipPathUnits: 'userSpaceOnUse'
+        },
+        contentGroups: [
+            'animation',
+            'descriptive',
+            'shape'
+        ],
+        content: [
+            'text',
+            'use'
+        ]
+    },
+    'color-profile': {
+        attrsGroups: [
+            'core',
+            'xlink'
+        ],
+        attrs: [
+            'local',
+            'name',
+            'rendering-intent'
+        ],
+        defaults: {
+            name: 'sRGB',
+            'rendering-intent': 'auto'
+        },
+        contentGroups: [
+            'descriptive'
+        ]
+    },
+    cursor: {
+        attrsGroups: [
+            'core',
+            'conditionalProcessing',
+            'xlink'
+        ],
+        attrs: [
+            'externalResourcesRequired',
+            'x',
+            'y'
+        ],
+        defaults: {
+            x: '0',
+            y: '0'
+        },
+        contentGroups: [
+            'descriptive'
+        ]
+    },
+    defs: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'graphicalEvent',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'transform'
+        ],
+        contentGroups: [
+            'animation',
+            'descriptive',
+            'shape',
+            'structural',
+            'paintServer'
+        ],
+        content: [
+            'a',
+            'altGlyphDef',
+            'clipPath',
+            'color-profile',
+            'cursor',
+            'filter',
+            'font',
+            'font-face',
+            'foreignObject',
+            'image',
+            'marker',
+            'mask',
+            'pattern',
+            'script',
+            'style',
+            'switch',
+            'text',
+            'view'
+        ]
+    },
+    desc: {
+        attrsGroups: [
+            'core'
+        ],
+        attrs: [
+            'class',
+            'style'
+        ]
+    },
+    ellipse: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'graphicalEvent',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'transform',
+            'cx',
+            'cy',
+            'rx',
+            'ry'
+        ],
+        defaults: {
+            cx: '0',
+            cy: '0'
+        },
+        contentGroups: [
+            'animation',
+            'descriptive'
+        ]
+    },
+    feBlend: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'filterPrimitive'
+        ],
+        attrs: [
+            'class',
+            'style',
+            // TODO: in - 'If no value is provided and this is the first filter primitive,
+            // then this filter primitive will use SourceGraphic as its input'
+            'in',
+            'in2',
+            'mode'
+        ],
+        defaults: {
+            mode: 'normal'
+        },
+        content: [
+            'animate',
+            'set'
+        ]
+    },
+    feColorMatrix: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'filterPrimitive'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'in',
+            'type',
+            'values'
+        ],
+        defaults: {
+            type: 'matrix'
+        },
+        content: [
+            'animate',
+            'set'
+        ]
+    },
+    feComponentTransfer: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'filterPrimitive'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'in'
+        ],
+        content: [
+            'feFuncA',
+            'feFuncB',
+            'feFuncG',
+            'feFuncR'
+        ]
+    },
+    feComposite: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'filterPrimitive'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'in',
+            'in2',
+            'operator',
+            'k1',
+            'k2',
+            'k3',
+            'k4'
+        ],
+        defaults: {
+            operator: 'over',
+            k1: '0',
+            k2: '0',
+            k3: '0',
+            k4: '0'
+        },
+        content: [
+            'animate',
+            'set'
+        ]
+    },
+    feConvolveMatrix: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'filterPrimitive'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'in',
+            'order',
+            'kernelMatrix',
+            // TODO: divisor - 'The default value is the sum of all values in kernelMatrix,
+            // with the exception that if the sum is zero, then the divisor is set to 1'
+            'divisor',
+            'bias',
+            // TODO: targetX - 'By default, the convolution matrix is centered in X over each
+            // pixel of the input image (i.e., targetX = floor ( orderX / 2 ))'
+            'targetX',
+            'targetY',
+            'edgeMode',
+            // TODO: kernelUnitLength - 'The first number is the <dx> value. The second number
+            // is the <dy> value. If the <dy> value is not specified, it defaults to the same value as <dx>'
+            'kernelUnitLength',
+            'preserveAlpha'
+        ],
+        defaults: {
+            order: '3',
+            bias: '0',
+            edgeMode: 'duplicate',
+            preserveAlpha: 'false'
+        },
+        content: [
+            'animate',
+            'set'
+        ]
+    },
+    feDiffuseLighting: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'filterPrimitive'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'in',
+            'surfaceScale',
+            'diffuseConstant',
+            'kernelUnitLength'
+        ],
+        defaults: {
+            surfaceScale: '1',
+            diffuseConstant: '1'
+        },
+        contentGroups: [
+            'descriptive'
+        ],
+        content: [
+            // TODO: 'exactly one light source element, in any order'
+            'feDistantLight',
+            'fePointLight',
+            'feSpotLight'
+        ]
+    },
+    feDisplacementMap: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'filterPrimitive'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'in',
+            'in2',
+            'scale',
+            'xChannelSelector',
+            'yChannelSelector'
+        ],
+        defaults: {
+            scale: '0',
+            xChannelSelector: 'A',
+            yChannelSelector: 'A'
+        },
+        content: [
+            'animate',
+            'set'
+        ]
+    },
+    feDistantLight: {
+        attrsGroups: [
+            'core'
+        ],
+        attrs: [
+            'azimuth',
+            'elevation'
+        ],
+        defaults: {
+            azimuth: '0',
+            elevation: '0'
+        },
+        content: [
+            'animate',
+            'set'
+        ]
+    },
+    feFlood: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'filterPrimitive'
+        ],
+        attrs: [
+            'class',
+            'style'
+        ],
+        content: [
+            'animate',
+            'animateColor',
+            'set'
+        ]
+    },
+    feFuncA: {
+        attrsGroups: [
+            'core',
+            'transferFunction'
+        ],
+        content: [
+            'set',
+            'animate'
+        ]
+    },
+    feFuncB: {
+        attrsGroups: [
+            'core',
+            'transferFunction'
+        ],
+        content: [
+            'set',
+            'animate'
+        ]
+    },
+    feFuncG: {
+        attrsGroups: [
+            'core',
+            'transferFunction'
+        ],
+        content: [
+            'set',
+            'animate'
+        ]
+    },
+    feFuncR: {
+        attrsGroups: [
+            'core',
+            'transferFunction'
+        ],
+        content: [
+            'set',
+            'animate'
+        ]
+    },
+    feGaussianBlur: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'filterPrimitive'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'in',
+            'stdDeviation'
+        ],
+        defaults: {
+            stdDeviation: '0'
+        },
+        content: [
+            'set',
+            'animate'
+        ]
+    },
+    feImage: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'filterPrimitive',
+            'xlink'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'preserveAspectRatio',
+            'xlink:href'
+        ],
+        defaults: {
+            preserveAspectRatio: 'xMidYMid meet'
+        },
+        content: [
+            'animate',
+            'animateTransform',
+            'set'
+        ]
+    },
+    feMerge: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'filterPrimitive'
+        ],
+        attrs: [
+            'class',
+            'style'
+        ],
+        content: [
+            'feMergeNode'
+        ]
+    },
+    feMergeNode: {
+        attrsGroups: [
+            'core'
+        ],
+        attrs: [
+            'in'
+        ],
+        content: [
+            'animate',
+            'set'
+        ]
+    },
+    feMorphology: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'filterPrimitive'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'in',
+            'operator',
+            'radius'
+        ],
+        defaults: {
+            operator: 'erode',
+            radius: '0'
+        },
+        content: [
+            'animate',
+            'set'
+        ]
+    },
+    feOffset: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'filterPrimitive'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'in',
+            'dx',
+            'dy'
+        ],
+        defaults: {
+            dx: '0',
+            dy: '0'
+        },
+        content: [
+            'animate',
+            'set'
+        ]
+    },
+    fePointLight: {
+        attrsGroups: [
+            'core'
+        ],
+        attrs: [
+            'x',
+            'y',
+            'z'
+        ],
+        defaults: {
+            x: '0',
+            y: '0',
+            z: '0'
+        },
+        content: [
+            'animate',
+            'set'
+        ]
+    },
+    feSpecularLighting: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'filterPrimitive'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'in',
+            'surfaceScale',
+            'specularConstant',
+            'specularExponent',
+            'kernelUnitLength'
+        ],
+        defaults: {
+            surfaceScale: '1',
+            specularConstant: '1',
+            specularExponent: '1'
+        },
+        contentGroups: [
+            'descriptive',
+            // TODO: exactly one 'light source element'
+            'lightSource'
+        ]
+    },
+    feSpotLight: {
+        attrsGroups: [
+            'core'
+        ],
+        attrs: [
+            'x',
+            'y',
+            'z',
+            'pointsAtX',
+            'pointsAtY',
+            'pointsAtZ',
+            'specularExponent',
+            'limitingConeAngle'
+        ],
+        defaults: {
+            x: '0',
+            y: '0',
+            z: '0',
+            pointsAtX: '0',
+            pointsAtY: '0',
+            pointsAtZ: '0',
+            specularExponent: '1'
+        },
+        content: [
+            'animate',
+            'set'
+        ]
+    },
+    feTile: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'filterPrimitive'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'in'
+        ],
+        content: [
+            'animate',
+            'set'
+        ]
+    },
+    feTurbulence: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'filterPrimitive'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'baseFrequency',
+            'numOctaves',
+            'seed',
+            'stitchTiles',
+            'type'
+        ],
+        defaults: {
+            baseFrequency: '0',
+            numOctaves: '1',
+            seed: '0',
+            stitchTiles: 'noStitch',
+            type: 'turbulence'
+        },
+        content: [
+            'animate',
+            'set'
+        ]
+    },
+    filter: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'xlink'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'x',
+            'y',
+            'width',
+            'height',
+            'filterRes',
+            'filterUnits',
+            'primitiveUnits',
+            'xlink:href'
+        ],
+        defaults: {
+            primitiveUnits: 'userSpaceOnUse',
+            x: '-10%',
+            y: '-10%',
+            width: '120%',
+            height: '120%'
+        },
+        contentGroups: [
+            'descriptive',
+            'filterPrimitive'
+        ],
+        content: [
+            'animate',
+            'set'
+        ]
+    },
+    font: {
+        attrsGroups: [
+            'core',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'horiz-origin-x',
+            'horiz-origin-y',
+            'horiz-adv-x',
+            'vert-origin-x',
+            'vert-origin-y',
+            'vert-adv-y'
+        ],
+        defaults: {
+            'horiz-origin-x': '0',
+            'horiz-origin-y': '0'
+        },
+        contentGroups: [
+            'descriptive'
+        ],
+        content: [
+            'font-face',
+            'glyph',
+            'hkern',
+            'missing-glyph',
+            'vkern'
+        ]
+    },
+    'font-face': {
+        attrsGroups: [
+            'core'
+        ],
+        attrs: [
+            'font-family',
+            'font-style',
+            'font-variant',
+            'font-weight',
+            'font-stretch',
+            'font-size',
+            'unicode-range',
+            'units-per-em',
+            'panose-1',
+            'stemv',
+            'stemh',
+            'slope',
+            'cap-height',
+            'x-height',
+            'accent-height',
+            'ascent',
+            'descent',
+            'widths',
+            'bbox',
+            'ideographic',
+            'alphabetic',
+            'mathematical',
+            'hanging',
+            'v-ideographic',
+            'v-alphabetic',
+            'v-mathematical',
+            'v-hanging',
+            'underline-position',
+            'underline-thickness',
+            'strikethrough-position',
+            'strikethrough-thickness',
+            'overline-position',
+            'overline-thickness'
+        ],
+        defaults: {
+            'font-style': 'all',
+            'font-variant': 'normal',
+            'font-weight': 'all',
+            'font-stretch': 'normal',
+            'unicode-range': 'U+0-10FFFF',
+            'units-per-em': '1000',
+            'panose-1': '0 0 0 0 0 0 0 0 0 0',
+            'slope': '0'
+        },
+        contentGroups: [
+            'descriptive'
+        ],
+        content: [
+            // TODO: "at most one 'font-face-src' element"
+            'font-face-src'
+        ]
+    },
+    // TODO: empty content
+    'font-face-format': {
+        attrsGroups: [
+            'core'
+        ],
+        attrs: [
+            'string'
+        ]
+    },
+    'font-face-name': {
+        attrsGroups: [
+            'core'
+        ],
+        attrs: [
+            'name'
+        ]
+    },
+    'font-face-src': {
+        attrsGroups: [
+            'core'
+        ],
+        content: [
+            'font-face-name',
+            'font-face-uri'
+        ]
+    },
+    'font-face-uri': {
+        attrsGroups: [
+            'core',
+            'xlink'
+        ],
+        attrs: [
+            'xlink:href'
+        ],
+        content: [
+            'font-face-format'
+        ]
+    },
+    foreignObject: {
+        attrsGroups: [
+            'core',
+            'conditionalProcessing',
+            'graphicalEvent',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'transform',
+            'x',
+            'y',
+            'width',
+            'height'
+        ],
+        defaults: {
+            x: 0,
+            y: 0
+        }
+    },
+    g: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'graphicalEvent',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'transform'
+        ],
+        contentGroups: [
+            'animation',
+            'descriptive',
+            'shape',
+            'structural',
+            'paintServer'
+        ],
+        content: [
+            'a',
+            'altGlyphDef',
+            'clipPath',
+            'color-profile',
+            'cursor',
+            'filter',
+            'font',
+            'font-face',
+            'foreignObject',
+            'image',
+            'marker',
+            'mask',
+            'pattern',
+            'script',
+            'style',
+            'switch',
+            'text',
+            'view'
+        ]
+    },
+    glyph: {
+        attrsGroups: [
+            'core',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'd',
+            'horiz-adv-x',
+            'vert-origin-x',
+            'vert-origin-y',
+            'vert-adv-y',
+            'unicode',
+            'glyph-name',
+            'orientation',
+            'arabic-form',
+            'lang'
+        ],
+        defaults: {
+            'arabic-form': 'initial'
+        },
+        contentGroups: [
+            'animation',
+            'descriptive',
+            'shape',
+            'structural',
+            'paintServer'
+        ],
+        content: [
+            'a',
+            'altGlyphDef',
+            'clipPath',
+            'color-profile',
+            'cursor',
+            'filter',
+            'font',
+            'font-face',
+            'foreignObject',
+            'image',
+            'marker',
+            'mask',
+            'pattern',
+            'script',
+            'style',
+            'switch',
+            'text',
+            'view'
+        ],
+    },
+    glyphRef: {
+        attrsGroups: [
+            'core',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'd',
+            'horiz-adv-x',
+            'vert-origin-x',
+            'vert-origin-y',
+            'vert-adv-y'
+        ],
+        contentGroups: [
+            'animation',
+            'descriptive',
+            'shape',
+            'structural',
+            'paintServer'
+        ],
+        content: [
+            'a',
+            'altGlyphDef',
+            'clipPath',
+            'color-profile',
+            'cursor',
+            'filter',
+            'font',
+            'font-face',
+            'foreignObject',
+            'image',
+            'marker',
+            'mask',
+            'pattern',
+            'script',
+            'style',
+            'switch',
+            'text',
+            'view'
+        ]
+    },
+    hatch: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'xlink'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'x',
+            'y',
+            'pitch',
+            'rotate',
+            'hatchUnits',
+            'hatchContentUnits',
+            'transform'
+        ],
+        defaults: {
+            hatchUnits: 'objectBoundingBox',
+            hatchContentUnits: 'userSpaceOnUse',
+            x: '0',
+            y: '0',
+            pitch: '0',
+            rotate: '0'
+        },
+        contentGroups: [
+            'animation',
+            'descriptive'
+        ],
+        content: [
+            'hatchPath'
+        ]
+    },
+    hatchPath: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'xlink'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'd',
+            'offset'
+        ],
+        defaults: {
+            offset: '0'
+        },
+        contentGroups: [
+            'animation',
+            'descriptive'
+        ]
+    },
+    hkern: {
+        attrsGroups: [
+            'core'
+        ],
+        attrs: [
+            'u1',
+            'g1',
+            'u2',
+            'g2',
+            'k'
+        ]
+    },
+    image: {
+        attrsGroups: [
+            'core',
+            'conditionalProcessing',
+            'graphicalEvent',
+            'xlink',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'preserveAspectRatio',
+            'transform',
+            'x',
+            'y',
+            'width',
+            'height',
+            'xlink:href'
+        ],
+        defaults: {
+            x: '0',
+            y: '0',
+            preserveAspectRatio: 'xMidYMid meet'
+        },
+        contentGroups: [
+            'animation',
+            'descriptive'
+        ]
+    },
+    line: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'graphicalEvent',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'transform',
+            'x1',
+            'y1',
+            'x2',
+            'y2'
+        ],
+        defaults: {
+            x1: '0',
+            y1: '0',
+            x2: '0',
+            y2: '0'
+        },
+        contentGroups: [
+            'animation',
+            'descriptive'
+        ]
+    },
+    linearGradient: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'xlink'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'x1',
+            'y1',
+            'x2',
+            'y2',
+            'gradientUnits',
+            'gradientTransform',
+            'spreadMethod',
+            'xlink:href'
+        ],
+        defaults: {
+            x1: '0',
+            y1: '0',
+            x2: '100%',
+            y2: '0',
+            spreadMethod: 'pad'
+        },
+        contentGroups: [
+            'descriptive'
+        ],
+        content: [
+            'animate',
+            'animateTransform',
+            'set',
+            'stop'
+        ]
+    },
+    marker: {
+        attrsGroups: [
+            'core',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'viewBox',
+            'preserveAspectRatio',
+            'refX',
+            'refY',
+            'markerUnits',
+            'markerWidth',
+            'markerHeight',
+            'orient'
+        ],
+        defaults: {
+            markerUnits: 'strokeWidth',
+            refX: '0',
+            refY: '0',
+            markerWidth: '3',
+            markerHeight: '3'
+        },
+        contentGroups: [
+            'animation',
+            'descriptive',
+            'shape',
+            'structural',
+            'paintServer'
+        ],
+        content: [
+            'a',
+            'altGlyphDef',
+            'clipPath',
+            'color-profile',
+            'cursor',
+            'filter',
+            'font',
+            'font-face',
+            'foreignObject',
+            'image',
+            'marker',
+            'mask',
+            'pattern',
+            'script',
+            'style',
+            'switch',
+            'text',
+            'view'
+        ]
+    },
+    mask: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'x',
+            'y',
+            'width',
+            'height',
+            'maskUnits',
+            'maskContentUnits'
+        ],
+        defaults: {
+            maskUnits: 'objectBoundingBox',
+            maskContentUnits: 'userSpaceOnUse',
+            x: '-10%',
+            y: '-10%',
+            width: '120%',
+            height: '120%'
+        },
+        contentGroups: [
+            'animation',
+            'descriptive',
+            'shape',
+            'structural',
+            'paintServer'
+        ],
+        content: [
+            'a',
+            'altGlyphDef',
+            'clipPath',
+            'color-profile',
+            'cursor',
+            'filter',
+            'font',
+            'font-face',
+            'foreignObject',
+            'image',
+            'marker',
+            'mask',
+            'pattern',
+            'script',
+            'style',
+            'switch',
+            'text',
+            'view'
+        ]
+    },
+    metadata: {
+        attrsGroups: [
+            'core'
+        ]
+    },
+    'missing-glyph': {
+        attrsGroups: [
+            'core',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'd',
+            'horiz-adv-x',
+            'vert-origin-x',
+            'vert-origin-y',
+            'vert-adv-y'
+        ],
+        contentGroups: [
+            'animation',
+            'descriptive',
+            'shape',
+            'structural',
+            'paintServer'
+        ],
+        content: [
+            'a',
+            'altGlyphDef',
+            'clipPath',
+            'color-profile',
+            'cursor',
+            'filter',
+            'font',
+            'font-face',
+            'foreignObject',
+            'image',
+            'marker',
+            'mask',
+            'pattern',
+            'script',
+            'style',
+            'switch',
+            'text',
+            'view'
+        ]
+    },
+    mpath: {
+        attrsGroups: [
+            'core',
+            'xlink'
+        ],
+        attrs: [
+            'externalResourcesRequired',
+            'xlink:href'
+        ],
+        contentGroups: [
+            'descriptive'
+        ]
+    },
+    path: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'graphicalEvent',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'transform',
+            'd',
+            'pathLength'
+        ],
+        contentGroups: [
+            'animation',
+            'descriptive'
+        ]
+    },
+    pattern: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'presentation',
+            'xlink'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'viewBox',
+            'preserveAspectRatio',
+            'x',
+            'y',
+            'width',
+            'height',
+            'patternUnits',
+            'patternContentUnits',
+            'patternTransform',
+            'xlink:href'
+        ],
+        defaults: {
+            patternUnits: 'objectBoundingBox',
+            patternContentUnits: 'userSpaceOnUse',
+            x: '0',
+            y: '0',
+            width: '0',
+            height: '0',
+            preserveAspectRatio: 'xMidYMid meet'
+        },
+        contentGroups: [
+            'animation',
+            'descriptive',
+            'paintServer',
+            'shape',
+            'structural'
+        ],
+        content: [
+            'a',
+            'altGlyphDef',
+            'clipPath',
+            'color-profile',
+            'cursor',
+            'filter',
+            'font',
+            'font-face',
+            'foreignObject',
+            'image',
+            'marker',
+            'mask',
+            'pattern',
+            'script',
+            'style',
+            'switch',
+            'text',
+            'view'
+        ]
+    },
+    polygon: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'graphicalEvent',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'transform',
+            'points'
+        ],
+        contentGroups: [
+            'animation',
+            'descriptive'
+        ]
+    },
+    polyline: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'graphicalEvent',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'transform',
+            'points'
+        ],
+        contentGroups: [
+            'animation',
+            'descriptive'
+        ]
+    },
+    radialGradient: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'xlink'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'cx',
+            'cy',
+            'r',
+            'fx',
+            'fy',
+            'fr',
+            'gradientUnits',
+            'gradientTransform',
+            'spreadMethod',
+            'xlink:href'
+        ],
+        defaults: {
+            gradientUnits: 'objectBoundingBox',
+            cx: '50%',
+            cy: '50%',
+            r: '50%'
+        },
+        contentGroups: [
+            'descriptive'
+        ],
+        content: [
+            'animate',
+            'animateTransform',
+            'set',
+            'stop'
+        ]
+    },
+    meshGradient: {
+        attrsGroups: [
+            'core',
+            'presentation',
+            'xlink'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'x',
+            'y',
+            'gradientUnits',
+            'transform'
+        ],
+        contentGroups: [
+            'descriptive',
+            'paintServer',
+            'animation',
+        ],
+        content: [
+            'meshRow'
+        ]
+    },
+    meshRow: {
+        attrsGroups: [
+            'core',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style'
+        ],
+        contentGroups: [
+            'descriptive'
+        ],
+        content: [
+            'meshPatch'
+        ]
+    },
+    meshPatch: {
+        attrsGroups: [
+            'core',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style'
+        ],
+        contentGroups: [
+            'descriptive'
+        ],
+        content: [
+            'stop'
+        ]
+    },
+    rect: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'graphicalEvent',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'transform',
+            'x',
+            'y',
+            'width',
+            'height',
+            'rx',
+            'ry'
+        ],
+        defaults: {
+            x: '0',
+            y: '0'
+        },
+        contentGroups: [
+            'animation',
+            'descriptive'
+        ]
+    },
+    script: {
+        attrsGroups: [
+            'core',
+            'xlink'
+        ],
+        attrs: [
+            'externalResourcesRequired',
+            'type',
+            'xlink:href'
+        ]
+    },
+    set: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'animation',
+            'xlink',
+            'animationAttributeTarget',
+            'animationTiming',
+        ],
+        attrs: [
+            'externalResourcesRequired',
+            'to'
+        ],
+        contentGroups: [
+            'descriptive'
+        ]
+    },
+    solidColor: {
+        attrsGroups: [
+            'core',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style'
+        ],
+        contentGroups: [
+            'paintServer'
+        ]
+    },
+    stop: {
+        attrsGroups: [
+            'core',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'offset',
+            'path'
+        ],
+        content: [
+            'animate',
+            'animateColor',
+            'set'
+        ]
+    },
+    style: {
+        attrsGroups: [
+            'core'
+        ],
+        attrs: [
+            'type',
+            'media',
+            'title'
+        ],
+        defaults: {
+            type: 'text/css'
+        }
+    },
+    svg: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'documentEvent',
+            'graphicalEvent',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'x',
+            'y',
+            'width',
+            'height',
+            'viewBox',
+            'preserveAspectRatio',
+            'zoomAndPan',
+            'version',
+            'baseProfile',
+            'contentScriptType',
+            'contentStyleType'
+        ],
+        defaults: {
+            x: '0',
+            y: '0',
+            width: '100%',
+            height: '100%',
+            preserveAspectRatio: 'xMidYMid meet',
+            zoomAndPan: 'magnify',
+            version: '1.1',
+            baseProfile: 'none',
+            contentScriptType: 'application/ecmascript',
+            contentStyleType: 'text/css'
+        },
+        contentGroups: [
+            'animation',
+            'descriptive',
+            'shape',
+            'structural',
+            'paintServer'
+        ],
+        content: [
+            'a',
+            'altGlyphDef',
+            'clipPath',
+            'color-profile',
+            'cursor',
+            'filter',
+            'font',
+            'font-face',
+            'foreignObject',
+            'image',
+            'marker',
+            'mask',
+            'pattern',
+            'script',
+            'style',
+            'switch',
+            'text',
+            'view'
+        ]
+    },
+    switch: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'graphicalEvent',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'transform'
+        ],
+        contentGroups: [
+            'animation',
+            'descriptive',
+            'shape'
+        ],
+        content: [
+            'a',
+            'foreignObject',
+            'g',
+            'image',
+            'svg',
+            'switch',
+            'text',
+            'use'
+        ]
+    },
+    symbol: {
+        attrsGroups: [
+            'core',
+            'graphicalEvent',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'preserveAspectRatio',
+            'viewBox',
+            'refX',
+            'refY'
+        ],
+        defaults: {
+            refX: 0,
+            refY: 0
+        },
+        contentGroups: [
+            'animation',
+            'descriptive',
+            'shape',
+            'structural',
+            'paintServer'
+        ],
+        content: [
+            'a',
+            'altGlyphDef',
+            'clipPath',
+            'color-profile',
+            'cursor',
+            'filter',
+            'font',
+            'font-face',
+            'foreignObject',
+            'image',
+            'marker',
+            'mask',
+            'pattern',
+            'script',
+            'style',
+            'switch',
+            'text',
+            'view'
+        ]
+    },
+    text: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'graphicalEvent',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'transform',
+            'lengthAdjust',
+            'x',
+            'y',
+            'dx',
+            'dy',
+            'rotate',
+            'textLength'
+        ],
+        defaults: {
+            x: '0',
+            y: '0',
+            lengthAdjust: 'spacing'
+        },
+        contentGroups: [
+            'animation',
+            'descriptive',
+            'textContentChild'
+        ],
+        content: [
+            'a'
+        ]
+    },
+    textPath: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'graphicalEvent',
+            'presentation',
+            'xlink'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'xlink:href',
+            'startOffset',
+            'method',
+            'spacing',
+            'd'
+        ],
+        defaults: {
+            startOffset: '0',
+            method: 'align',
+            spacing: 'exact'
+        },
+        contentGroups: [
+            'descriptive'
+        ],
+        content: [
+            'a',
+            'altGlyph',
+            'animate',
+            'animateColor',
+            'set',
+            'tref',
+            'tspan'
+        ]
+    },
+    title: {
+        attrsGroups: [
+            'core'
+        ],
+        attrs: [
+            'class',
+            'style'
+        ]
+    },
+    tref: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'graphicalEvent',
+            'presentation',
+            'xlink'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'xlink:href'
+        ],
+        contentGroups: [
+            'descriptive'
+        ],
+        content: [
+            'animate',
+            'animateColor',
+            'set'
+        ]
+    },
+    tspan: {
+        attrsGroups: [
+            'conditionalProcessing',
+            'core',
+            'graphicalEvent',
+            'presentation'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'x',
+            'y',
+            'dx',
+            'dy',
+            'rotate',
+            'textLength',
+            'lengthAdjust'
+        ],
+        contentGroups: [
+            'descriptive'
+        ],
+        content: [
+            'a',
+            'altGlyph',
+            'animate',
+            'animateColor',
+            'set',
+            'tref',
+            'tspan'
+        ]
+    },
+    use: {
+        attrsGroups: [
+            'core',
+            'conditionalProcessing',
+            'graphicalEvent',
+            'presentation',
+            'xlink'
+        ],
+        attrs: [
+            'class',
+            'style',
+            'externalResourcesRequired',
+            'transform',
+            'x',
+            'y',
+            'width',
+            'height',
+            'xlink:href'
+        ],
+        defaults: {
+            x: '0',
+            y: '0'
+        },
+        contentGroups: [
+            'animation',
+            'descriptive'
+        ]
+    },
+    view: {
+        attrsGroups: [
+            'core'
+        ],
+        attrs: [
+            'externalResourcesRequired',
+            'viewBox',
+            'preserveAspectRatio',
+            'zoomAndPan',
+            'viewTarget'
+        ],
+        contentGroups: [
+            'descriptive'
+        ]
+    },
+    vkern: {
+        attrsGroups: [
+            'core'
+        ],
+        attrs: [
+            'u1',
+            'g1',
+            'u2',
+            'g2',
+            'k'
+        ]
+    }
+};
+
+// http://wiki.inkscape.org/wiki/index.php/Inkscape-specific_XML_attributes
+exports.editorNamespaces = [
+    'http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd',
+    'http://inkscape.sourceforge.net/DTD/sodipodi-0.dtd',
+    'http://www.inkscape.org/namespaces/inkscape',
+    'http://www.bohemiancoding.com/sketch/ns',
+    'http://ns.adobe.com/AdobeIllustrator/10.0/',
+    'http://ns.adobe.com/Graphs/1.0/',
+    'http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/',
+    'http://ns.adobe.com/Variables/1.0/',
+    'http://ns.adobe.com/SaveForWeb/1.0/',
+    'http://ns.adobe.com/Extensibility/1.0/',
+    'http://ns.adobe.com/Flows/1.0/',
+    'http://ns.adobe.com/ImageReplacement/1.0/',
+    'http://ns.adobe.com/GenericCustomNamespace/1.0/',
+    'http://ns.adobe.com/XPath/1.0/'
+];
+
+// http://www.w3.org/TR/SVG/linking.html#processingIRI
+exports.referencesProps = [
+    'clip-path',
+    'color-profile',
+    'fill',
+    'filter',
+    'marker-start',
+    'marker-mid',
+    'marker-end',
+    'mask',
+    'stroke',
+    'style'
+];
+
+// http://www.w3.org/TR/SVG/propidx.html
+exports.inheritableAttrs = [
+    'clip-rule',
+    'color',
+    'color-interpolation',
+    'color-interpolation-filters',
+    'color-profile',
+    'color-rendering',
+    'cursor',
+    'direction',
+    'fill',
+    'fill-opacity',
+    'fill-rule',
+    'font',
+    'font-family',
+    'font-size',
+    'font-size-adjust',
+    'font-stretch',
+    'font-style',
+    'font-variant',
+    'font-weight',
+    'glyph-orientation-horizontal',
+    'glyph-orientation-vertical',
+    'image-rendering',
+    'kerning',
+    'letter-spacing',
+    'marker',
+    'marker-end',
+    'marker-mid',
+    'marker-start',
+    'pointer-events',
+    'shape-rendering',
+    'stroke',
+    'stroke-dasharray',
+    'stroke-dashoffset',
+    'stroke-linecap',
+    'stroke-linejoin',
+    'stroke-miterlimit',
+    'stroke-opacity',
+    'stroke-width',
+    'text-anchor',
+    'text-rendering',
+    'transform',
+    'visibility',
+    'white-space',
+    'word-spacing',
+    'writing-mode'
+];
+
+// http://www.w3.org/TR/SVG/single-page.html#types-ColorKeywords
+exports.colorsNames = {
+    'aliceblue': '#f0f8ff',
+    'antiquewhite': '#faebd7',
+    'aqua': '#0ff',
+    'aquamarine': '#7fffd4',
+    'azure': '#f0ffff',
+    'beige': '#f5f5dc',
+    'bisque': '#ffe4c4',
+    'black': '#000',
+    'blanchedalmond': '#ffebcd',
+    'blue': '#00f',
+    'blueviolet': '#8a2be2',
+    'brown': '#a52a2a',
+    'burlywood': '#deb887',
+    'cadetblue': '#5f9ea0',
+    'chartreuse': '#7fff00',
+    'chocolate': '#d2691e',
+    'coral': '#ff7f50',
+    'cornflowerblue': '#6495ed',
+    'cornsilk': '#fff8dc',
+    'crimson': '#dc143c',
+    'cyan': '#0ff',
+    'darkblue': '#00008b',
+    'darkcyan': '#008b8b',
+    'darkgoldenrod': '#b8860b',
+    'darkgray': '#a9a9a9',
+    'darkgreen': '#006400',
+    'darkkhaki': '#bdb76b',
+    'darkmagenta': '#8b008b',
+    'darkolivegreen': '#556b2f',
+    'darkorange': '#ff8c00',
+    'darkorchid': '#9932cc',
+    'darkred': '#8b0000',
+    'darksalmon': '#e9967a',
+    'darkseagreen': '#8fbc8f',
+    'darkslateblue': '#483d8b',
+    'darkslategray': '#2f4f4f',
+    'darkturquoise': '#00ced1',
+    'darkviolet': '#9400d3',
+    'deeppink': '#ff1493',
+    'deepskyblue': '#00bfff',
+    'dimgray': '#696969',
+    'dodgerblue': '#1e90ff',
+    'firebrick': '#b22222',
+    'floralwhite': '#fffaf0',
+    'forestgreen': '#228b22',
+    'fuchsia': '#f0f',
+    'gainsboro': '#dcdcdc',
+    'ghostwhite': '#f8f8ff',
+    'gold': '#ffd700',
+    'goldenrod': '#daa520',
+    'gray': '#808080',
+    'green': '#008000',
+    'greenyellow': '#adff2f',
+    'honeydew': '#f0fff0',
+    'hotpink': '#ff69b4',
+    'indianred': '#cd5c5c',
+    'indigo': '#4b0082',
+    'ivory': '#fffff0',
+    'khaki': '#f0e68c',
+    'lavender': '#e6e6fa',
+    'lavenderblush': '#fff0f5',
+    'lawngreen': '#7cfc00',
+    'lemonchiffon': '#fffacd',
+    'lightblue': '#add8e6',
+    'lightcoral': '#f08080',
+    'lightcyan': '#e0ffff',
+    'lightgoldenrodyellow': '#fafad2',
+    'lightgreen': '#90ee90',
+    'lightgrey': '#d3d3d3',
+    'lightpink': '#ffb6c1',
+    'lightsalmon': '#ffa07a',
+    'lightseagreen': '#20b2aa',
+    'lightskyblue': '#87cefa',
+    'lightslategray': '#789',
+    'lightsteelblue': '#b0c4de',
+    'lightyellow': '#ffffe0',
+    'lime': '#0f0',
+    'limegreen': '#32cd32',
+    'linen': '#faf0e6',
+    'magenta': '#f0f',
+    'maroon': '#800000',
+    'mediumaquamarine': '#66cdaa',
+    'mediumblue': '#0000cd',
+    'mediumorchid': '#ba55d3',
+    'mediumpurple': '#9370db',
+    'mediumseagreen': '#3cb371',
+    'mediumslateblue': '#7b68ee',
+    'mediumspringgreen': '#00fa9a',
+    'mediumturquoise': '#48d1cc',
+    'mediumvioletred': '#c71585',
+    'midnightblue': '#191970',
+    'mintcream': '#f5fffa',
+    'mistyrose': '#ffe4e1',
+    'moccasin': '#ffe4b5',
+    'navajowhite': '#ffdead',
+    'navy': '#000080',
+    'oldlace': '#fdf5e6',
+    'olive': '#808000',
+    'olivedrab': '#6b8e23',
+    'orange': '#ffa500',
+    'orangered': '#ff4500',
+    'orchid': '#da70d6',
+    'palegoldenrod': '#eee8aa',
+    'palegreen': '#98fb98',
+    'paleturquoise': '#afeeee',
+    'palevioletred': '#db7093',
+    'papayawhip': '#ffefd5',
+    'peachpuff': '#ffdab9',
+    'peru': '#cd853f',
+    'pink': '#ffc0cb',
+    'plum': '#dda0dd',
+    'powderblue': '#b0e0e6',
+    'purple': '#800080',
+    'red': '#f00',
+    'rosybrown': '#bc8f8f',
+    'royalblue': '#4169e1',
+    'saddlebrown': '#8b4513',
+    'salmon': '#fa8072',
+    'sandybrown': '#f4a460',
+    'seagreen': '#2e8b57',
+    'seashell': '#fff5ee',
+    'sienna': '#a0522d',
+    'silver': '#c0c0c0',
+    'skyblue': '#87ceeb',
+    'slateblue': '#6a5acd',
+    'slategray': '#708090',
+    'snow': '#fffafa',
+    'springgreen': '#00ff7f',
+    'steelblue': '#4682b4',
+    'tan': '#d2b48c',
+    'teal': '#008080',
+    'thistle': '#d8bfd8',
+    'tomato': '#ff6347',
+    'turquoise': '#40e0d0',
+    'violet': '#ee82ee',
+    'wheat': '#f5deb3',
+    'white': '#fff',
+    'whitesmoke': '#f5f5f5',
+    'yellow': '#ff0',
+    'yellowgreen': '#9acd32'
+};
+
+exports.colorsShortNames = {
+  '#f0ffff': 'azure',
+  '#f5f5dc': 'beige',
+  '#ffe4c4': 'bisque',
+  '#a52a2a': 'brown',
+  '#ff7f50': 'coral',
+  '#ffd700': 'gold',
+  '#808080': 'gray',
+  '#008000': 'green',
+  '#4b0082': 'indigo',
+  '#fffff0': 'ivory',
+  '#f0e68c': 'khaki',
+  '#faf0e6': 'linen',
+  '#800000': 'maroon',
+  '#000080': 'navy',
+  '#808000': 'olive',
+  '#ffa500': 'orange',
+  '#da70d6': 'orchid',
+  '#cd853f': 'peru',
+  '#ffc0cb': 'pink',
+  '#dda0dd': 'plum',
+  '#800080': 'purple',
+  '#f00': 'red',
+  '#fa8072': 'salmon',
+  '#a0522d': 'sienna',
+  '#c0c0c0': 'silver',
+  '#fffafa': 'snow',
+  '#d2b48c': 'tan',
+  '#008080': 'teal',
+  '#ff6347': 'tomato',
+  '#ee82ee': 'violet',
+  '#f5deb3': 'wheat'
+};
+
+// http://www.w3.org/TR/SVG/single-page.html#types-DataTypeColor
+exports.colorsProps = [
+    'color', 'fill', 'stroke', 'stop-color', 'flood-color', 'lighting-color'
+];
diff --git a/node_modules/svgo/plugins/_path.js b/node_modules/svgo/plugins/_path.js
new file mode 100644
index 00000000..2aa567a0
--- /dev/null
+++ b/node_modules/svgo/plugins/_path.js
@@ -0,0 +1,962 @@
+/* global a2c */
+'use strict';
+
+var regPathInstructions = /([MmLlHhVvCcSsQqTtAaZz])\s*/,
+    regPathData = /[-+]?(?:\d*\.\d+|\d+\.?)([eE][-+]?\d+)?/g,
+    regNumericValues = /[-+]?(\d*\.\d+|\d+\.?)(?:[eE][-+]?\d+)?/,
+    transform2js = require('./_transforms').transform2js,
+    transformsMultiply = require('./_transforms').transformsMultiply,
+    transformArc = require('./_transforms').transformArc,
+    collections = require('./_collections.js'),
+    referencesProps = collections.referencesProps,
+    defaultStrokeWidth = collections.attrsGroupsDefaults.presentation['stroke-width'],
+    cleanupOutData = require('../lib/svgo/tools').cleanupOutData,
+    removeLeadingZero = require('../lib/svgo/tools').removeLeadingZero,
+    prevCtrlPoint;
+
+/**
+ * Convert path string to JS representation.
+ *
+ * @param {String} pathString input string
+ * @param {Object} params plugin params
+ * @return {Array} output array
+ */
+exports.path2js = function(path) {
+    if (path.pathJS) return path.pathJS;
+
+    var paramsLength = { // Number of parameters of every path command
+            H: 1, V: 1, M: 2, L: 2, T: 2, Q: 4, S: 4, C: 6, A: 7,
+            h: 1, v: 1, m: 2, l: 2, t: 2, q: 4, s: 4, c: 6, a: 7
+        },
+        pathData = [],   // JS representation of the path data
+        instruction, // current instruction context
+        startMoveto = false;
+
+    // splitting path string into array like ['M', '10 50', 'L', '20 30']
+    path.attr('d').value.split(regPathInstructions).forEach(function(data) {
+        if (!data) return;
+        if (!startMoveto) {
+            if (data == 'M' || data == 'm') {
+                startMoveto = true;
+            } else return;
+        }
+
+        // instruction item
+        if (regPathInstructions.test(data)) {
+            instruction = data;
+
+            // z - instruction w/o data
+            if (instruction == 'Z' || instruction == 'z') {
+                pathData.push({
+                    instruction: 'z'
+                });
+            }
+        // data item
+        } else {
+            data = data.match(regPathData);
+            if (!data) return;
+
+            data = data.map(Number);
+
+            // Subsequent moveto pairs of coordinates are threated as implicit lineto commands
+            // http://www.w3.org/TR/SVG/paths.html#PathDataMovetoCommands
+            if (instruction == 'M' || instruction == 'm') {
+                pathData.push({
+                    instruction: pathData.length == 0 ? 'M' : instruction,
+                    data: data.splice(0, 2)
+                });
+                instruction = instruction == 'M' ? 'L' : 'l';
+            }
+
+            for (var pair = paramsLength[instruction]; data.length;) {
+                pathData.push({
+                    instruction: instruction,
+                    data: data.splice(0, pair)
+                });
+            }
+        }
+    });
+
+    // First moveto is actually absolute. Subsequent coordinates were separated above.
+    if (pathData.length && pathData[0].instruction == 'm') {
+        pathData[0].instruction = 'M';
+    }
+    path.pathJS = pathData;
+
+    return pathData;
+};
+
+/**
+ * Convert relative Path data to absolute.
+ *
+ * @param {Array} data input data
+ * @return {Array} output data
+ */
+var relative2absolute = exports.relative2absolute = function(data) {
+    var currentPoint = [0, 0],
+        subpathPoint = [0, 0],
+        i;
+
+    data = data.map(function(item) {
+
+        var instruction = item.instruction,
+            itemData = item.data && item.data.slice();
+
+        if (instruction == 'M') {
+
+            set(currentPoint, itemData);
+            set(subpathPoint, itemData);
+
+        } else if ('mlcsqt'.indexOf(instruction) > -1) {
+
+            for (i = 0; i < itemData.length; i++) {
+                itemData[i] += currentPoint[i % 2];
+            }
+            set(currentPoint, itemData);
+
+            if (instruction == 'm') {
+                set(subpathPoint, itemData);
+            }
+
+        } else if (instruction == 'a') {
+
+            itemData[5] += currentPoint[0];
+            itemData[6] += currentPoint[1];
+            set(currentPoint, itemData);
+
+        } else if (instruction == 'h') {
+
+            itemData[0] += currentPoint[0];
+            currentPoint[0] = itemData[0];
+
+        } else if (instruction == 'v') {
+
+            itemData[0] += currentPoint[1];
+            currentPoint[1] = itemData[0];
+
+        } else if ('MZLCSQTA'.indexOf(instruction) > -1) {
+
+            set(currentPoint, itemData);
+
+        } else if (instruction == 'H') {
+
+            currentPoint[0] = itemData[0];
+
+        } else if (instruction == 'V') {
+
+            currentPoint[1] = itemData[0];
+
+        } else if (instruction == 'z') {
+
+            set(currentPoint, subpathPoint);
+
+        }
+
+        return instruction == 'z' ?
+            { instruction: 'z' } :
+            {
+                instruction: instruction.toUpperCase(),
+                data: itemData
+            };
+
+    });
+
+    return data;
+};
+
+/**
+ * Apply transformation(s) to the Path data.
+ *
+ * @param {Object} elem current element
+ * @param {Array} path input path data
+ * @param {Object} params whether to apply transforms to stroked lines and transform precision (used for stroke width)
+ * @return {Array} output path data
+ */
+exports.applyTransforms = function(elem, path, params) {
+    // if there are no 'stroke' attr and references to other objects such as
+    // gradiends or clip-path which are also subjects to transform.
+    if (!elem.hasAttr('transform') || !elem.attr('transform').value ||
+        elem.someAttr(function(attr) {
+            return ~referencesProps.indexOf(attr.name) && ~attr.value.indexOf('url(');
+        }))
+        return path;
+
+    var matrix = transformsMultiply(transform2js(elem.attr('transform').value)),
+        stroke = elem.computedAttr('stroke'),
+        id = elem.computedAttr('id'),
+        transformPrecision = params.transformPrecision,
+        newPoint, scale;
+
+    if (stroke && stroke != 'none') {
+        if (!params.applyTransformsStroked ||
+            (matrix.data[0] != matrix.data[3] || matrix.data[1] != -matrix.data[2]) &&
+            (matrix.data[0] != -matrix.data[3] || matrix.data[1] != matrix.data[2]))
+            return path;
+
+        // "stroke-width" should be inside the part with ID, otherwise it can be overrided in <use>
+        if (id) {
+            var idElem = elem,
+                hasStrokeWidth = false;
+
+            do {
+                if (idElem.hasAttr('stroke-width')) hasStrokeWidth = true;
+            } while (!idElem.hasAttr('id', id) && !hasStrokeWidth && (idElem = idElem.parentNode));
+
+            if (!hasStrokeWidth) return path;
+        }
+
+        scale = +Math.sqrt(matrix.data[0] * matrix.data[0] + matrix.data[1] * matrix.data[1]).toFixed(transformPrecision);
+
+        if (scale !== 1) {
+            var strokeWidth = elem.computedAttr('stroke-width') || defaultStrokeWidth;
+
+            if (elem.hasAttr('stroke-width')) {
+                elem.attrs['stroke-width'].value = elem.attrs['stroke-width'].value.trim()
+                    .replace(regNumericValues, function(num) { return removeLeadingZero(num * scale) });
+            } else {
+                elem.addAttr({
+                    name: 'stroke-width',
+                    prefix: '',
+                    local: 'stroke-width',
+                    value: strokeWidth.replace(regNumericValues, function(num) { return removeLeadingZero(num * scale) })
+                });
+            }
+        }
+    } else if (id) { // Stroke and stroke-width can be redefined with <use>
+        return path;
+    }
+
+    path.forEach(function(pathItem) {
+
+        if (pathItem.data) {
+
+            // h -> l
+            if (pathItem.instruction === 'h') {
+
+                pathItem.instruction = 'l';
+                pathItem.data[1] = 0;
+
+            // v -> l
+            } else if (pathItem.instruction === 'v') {
+
+                pathItem.instruction = 'l';
+                pathItem.data[1] = pathItem.data[0];
+                pathItem.data[0] = 0;
+
+            }
+
+            // if there is a translate() transform
+            if (pathItem.instruction === 'M' &&
+                (matrix.data[4] !== 0 ||
+                matrix.data[5] !== 0)
+            ) {
+
+                // then apply it only to the first absoluted M
+                newPoint = transformPoint(matrix.data, pathItem.data[0], pathItem.data[1]);
+                set(pathItem.data, newPoint);
+                set(pathItem.coords, newPoint);
+
+                // clear translate() data from transform matrix
+                matrix.data[4] = 0;
+                matrix.data[5] = 0;
+
+            } else {
+
+                if (pathItem.instruction == 'a') {
+
+                    transformArc(pathItem.data, matrix.data);
+
+                    // reduce number of digits in rotation angle
+                    if (Math.abs(pathItem.data[2]) > 80) {
+                        var a = pathItem.data[0],
+                            rotation = pathItem.data[2];
+                        pathItem.data[0] = pathItem.data[1];
+                        pathItem.data[1] = a;
+                        pathItem.data[2] = rotation + (rotation > 0 ? -90 : 90);
+                    }
+
+                    newPoint = transformPoint(matrix.data, pathItem.data[5], pathItem.data[6]);
+                    pathItem.data[5] = newPoint[0];
+                    pathItem.data[6] = newPoint[1];
+
+                } else {
+
+                    for (var i = 0; i < pathItem.data.length; i += 2) {
+                        newPoint = transformPoint(matrix.data, pathItem.data[i], pathItem.data[i + 1]);
+                        pathItem.data[i] = newPoint[0];
+                        pathItem.data[i + 1] = newPoint[1];
+                    }
+                }
+
+                pathItem.coords[0] = pathItem.base[0] + pathItem.data[pathItem.data.length - 2];
+                pathItem.coords[1] = pathItem.base[1] + pathItem.data[pathItem.data.length - 1];
+
+            }
+
+        }
+
+    });
+
+    // remove transform attr
+    elem.removeAttr('transform');
+
+    return path;
+};
+
+/**
+ * Apply transform 3x3 matrix to x-y point.
+ *
+ * @param {Array} matrix transform 3x3 matrix
+ * @param {Array} point x-y point
+ * @return {Array} point with new coordinates
+ */
+function transformPoint(matrix, x, y) {
+
+    return [
+        matrix[0] * x + matrix[2] * y + matrix[4],
+        matrix[1] * x + matrix[3] * y + matrix[5]
+    ];
+
+}
+
+/**
+ * Compute Cubic Bézie bounding box.
+ *
+ * @see http://processingjs.nihongoresources.com/bezierinfo/
+ *
+ * @param {Float} xa
+ * @param {Float} ya
+ * @param {Float} xb
+ * @param {Float} yb
+ * @param {Float} xc
+ * @param {Float} yc
+ * @param {Float} xd
+ * @param {Float} yd
+ *
+ * @return {Object}
+ */
+exports.computeCubicBoundingBox = function(xa, ya, xb, yb, xc, yc, xd, yd) {
+
+    var minx = Number.POSITIVE_INFINITY,
+        miny = Number.POSITIVE_INFINITY,
+        maxx = Number.NEGATIVE_INFINITY,
+        maxy = Number.NEGATIVE_INFINITY,
+        ts,
+        t,
+        x,
+        y,
+        i;
+
+    // X
+    if (xa < minx) { minx = xa; }
+    if (xa > maxx) { maxx = xa; }
+    if (xd < minx) { minx= xd; }
+    if (xd > maxx) { maxx = xd; }
+
+    ts = computeCubicFirstDerivativeRoots(xa, xb, xc, xd);
+
+    for (i = 0; i < ts.length; i++) {
+
+        t = ts[i];
+
+        if (t >= 0 && t <= 1) {
+            x = computeCubicBaseValue(t, xa, xb, xc, xd);
+            // y = computeCubicBaseValue(t, ya, yb, yc, yd);
+
+            if (x < minx) { minx = x; }
+            if (x > maxx) { maxx = x; }
+        }
+
+    }
+
+    // Y
+    if (ya < miny) { miny = ya; }
+    if (ya > maxy) { maxy = ya; }
+    if (yd < miny) { miny = yd; }
+    if (yd > maxy) { maxy = yd; }
+
+    ts = computeCubicFirstDerivativeRoots(ya, yb, yc, yd);
+
+    for (i = 0; i < ts.length; i++) {
+
+        t = ts[i];
+
+        if (t >= 0 && t <= 1) {
+            // x = computeCubicBaseValue(t, xa, xb, xc, xd);
+            y = computeCubicBaseValue(t, ya, yb, yc, yd);
+
+            if (y < miny) { miny = y; }
+            if (y > maxy) { maxy = y; }
+        }
+
+    }
+
+    return {
+        minx: minx,
+        miny: miny,
+        maxx: maxx,
+        maxy: maxy
+    };
+
+};
+
+// compute the value for the cubic bezier function at time=t
+function computeCubicBaseValue(t, a, b, c, d) {
+
+    var mt = 1 - t;
+
+    return mt * mt * mt * a + 3 * mt * mt * t * b + 3 * mt * t * t * c + t * t * t * d;
+
+}
+
+// compute the value for the first derivative of the cubic bezier function at time=t
+function computeCubicFirstDerivativeRoots(a, b, c, d) {
+
+    var result = [-1, -1],
+        tl = -a + 2 * b - c,
+        tr = -Math.sqrt(-a * (c - d) + b * b - b * (c + d) + c * c),
+        dn = -a + 3 * b - 3 * c + d;
+
+    if (dn !== 0) {
+        result[0] = (tl + tr) / dn;
+        result[1] = (tl - tr) / dn;
+    }
+
+    return result;
+
+}
+
+/**
+ * Compute Quadratic Bézier bounding box.
+ *
+ * @see http://processingjs.nihongoresources.com/bezierinfo/
+ *
+ * @param {Float} xa
+ * @param {Float} ya
+ * @param {Float} xb
+ * @param {Float} yb
+ * @param {Float} xc
+ * @param {Float} yc
+ *
+ * @return {Object}
+ */
+exports.computeQuadraticBoundingBox = function(xa, ya, xb, yb, xc, yc) {
+
+    var minx = Number.POSITIVE_INFINITY,
+        miny = Number.POSITIVE_INFINITY,
+        maxx = Number.NEGATIVE_INFINITY,
+        maxy = Number.NEGATIVE_INFINITY,
+        t,
+        x,
+        y;
+
+    // X
+    if (xa < minx) { minx = xa; }
+    if (xa > maxx) { maxx = xa; }
+    if (xc < minx) { minx = xc; }
+    if (xc > maxx) { maxx = xc; }
+
+    t = computeQuadraticFirstDerivativeRoot(xa, xb, xc);
+
+    if (t >= 0 && t <= 1) {
+        x = computeQuadraticBaseValue(t, xa, xb, xc);
+        // y = computeQuadraticBaseValue(t, ya, yb, yc);
+
+        if (x < minx) { minx = x; }
+        if (x > maxx) { maxx = x; }
+    }
+
+    // Y
+    if (ya < miny) { miny = ya; }
+    if (ya > maxy) { maxy = ya; }
+    if (yc < miny) { miny = yc; }
+    if (yc > maxy) { maxy = yc; }
+
+    t = computeQuadraticFirstDerivativeRoot(ya, yb, yc);
+
+    if (t >= 0 && t <=1 ) {
+        // x = computeQuadraticBaseValue(t, xa, xb, xc);
+        y = computeQuadraticBaseValue(t, ya, yb, yc);
+
+        if (y < miny) { miny = y; }
+        if (y > maxy) { maxy = y ; }
+
+    }
+
+    return {
+        minx: minx,
+        miny: miny,
+        maxx: maxx,
+        maxy: maxy
+    };
+
+};
+
+// compute the value for the quadratic bezier function at time=t
+function computeQuadraticBaseValue(t, a, b, c) {
+
+    var mt = 1 - t;
+
+    return mt * mt * a + 2 * mt * t * b + t * t * c;
+
+}
+
+// compute the value for the first derivative of the quadratic bezier function at time=t
+function computeQuadraticFirstDerivativeRoot(a, b, c) {
+
+    var t = -1,
+        denominator = a - 2 * b + c;
+
+    if (denominator !== 0) {
+        t = (a - b) / denominator;
+    }
+
+    return t;
+
+}
+
+/**
+ * Convert path array to string.
+ *
+ * @param {Array} path input path data
+ * @param {Object} params plugin params
+ * @return {String} output path string
+ */
+exports.js2path = function(path, data, params) {
+
+    path.pathJS = data;
+
+    if (params.collapseRepeated) {
+        data = collapseRepeated(data);
+    }
+
+    path.attr('d').value = data.reduce(function(pathString, item) {
+        return pathString += item.instruction + (item.data ? cleanupOutData(item.data, params) : '');
+    }, '');
+
+};
+
+/**
+ * Collapse repeated instructions data
+ *
+ * @param {Array} path input path data
+ * @return {Array} output path data
+ */
+function collapseRepeated(data) {
+
+    var prev,
+        prevIndex;
+
+    // copy an array and modifieds item to keep original data untouched
+    data = data.reduce(function(newPath, item) {
+        if (
+            prev && item.data &&
+            item.instruction == prev.instruction
+        ) {
+            // concat previous data with current
+            if (item.instruction != 'M') {
+                prev = newPath[prevIndex] = {
+                    instruction: prev.instruction,
+                    data: prev.data.concat(item.data),
+                    coords: item.coords,
+                    base: prev.base
+                };
+            } else {
+                prev.data = item.data;
+                prev.coords = item.coords;
+            }
+        } else {
+            newPath.push(item);
+            prev = item;
+            prevIndex = newPath.length - 1;
+        }
+
+        return newPath;
+    }, []);
+
+    return data;
+
+}
+
+function set(dest, source) {
+    dest[0] = source[source.length - 2];
+    dest[1] = source[source.length - 1];
+    return dest;
+}
+
+/**
+ * Checks if two paths have an intersection by checking convex hulls
+ * collision using Gilbert-Johnson-Keerthi distance algorithm
+ * http://entropyinteractive.com/2011/04/gjk-algorithm/
+ *
+ * @param {Array} path1 JS path representation
+ * @param {Array} path2 JS path representation
+ * @return {Boolean}
+ */
+exports.intersects = function(path1, path2) {
+    if (path1.length < 3 || path2.length < 3) return false; // nothing to fill
+
+    // Collect points of every subpath.
+    var points1 = relative2absolute(path1).reduce(gatherPoints, []),
+        points2 = relative2absolute(path2).reduce(gatherPoints, []);
+
+    // Axis-aligned bounding box check.
+    if (points1.maxX <= points2.minX || points2.maxX <= points1.minX ||
+        points1.maxY <= points2.minY || points2.maxY <= points1.minY ||
+        points1.every(function (set1) {
+            return points2.every(function (set2) {
+                return set1[set1.maxX][0] <= set2[set2.minX][0] ||
+                    set2[set2.maxX][0] <= set1[set1.minX][0] ||
+                    set1[set1.maxY][1] <= set2[set2.minY][1] ||
+                    set2[set2.maxY][1] <= set1[set1.minY][1];
+            });
+        })
+    ) return false;
+
+    // Get a convex hull from points of each subpath. Has the most complexity O(n·log n).
+    var hullNest1 = points1.map(convexHull),
+        hullNest2 = points2.map(convexHull);
+
+    // Check intersection of every subpath of the first path with every subpath of the second.
+    return hullNest1.some(function(hull1) {
+        if (hull1.length < 3) return false;
+
+        return hullNest2.some(function(hull2) {
+            if (hull2.length < 3) return false;
+
+            var simplex = [getSupport(hull1, hull2, [1, 0])], // create the initial simplex
+                direction = minus(simplex[0]); // set the direction to point towards the origin
+
+            var iterations = 1e4; // infinite loop protection, 10 000 iterations is more than enough
+            while (true) {
+                if (iterations-- == 0) {
+                    console.error('Error: infinite loop while processing mergePaths plugin.');
+                    return true; // true is the safe value that means “do nothing with paths”
+                }
+                // add a new point
+                simplex.push(getSupport(hull1, hull2, direction));
+                // see if the new point was on the correct side of the origin
+                if (dot(direction, simplex[simplex.length - 1]) <= 0) return false;
+                // process the simplex
+                if (processSimplex(simplex, direction)) return true;
+            }
+        });
+    });
+
+    function getSupport(a, b, direction) {
+        return sub(supportPoint(a, direction), supportPoint(b, minus(direction)));
+    }
+
+    // Computes farthest polygon point in particular direction.
+    // Thanks to knowledge of min/max x and y coordinates we can choose a quadrant to search in.
+    // Since we're working on convex hull, the dot product is increasing until we find the farthest point.
+    function supportPoint(polygon, direction) {
+        var index = direction[1] >= 0 ?
+                direction[0] < 0 ? polygon.maxY : polygon.maxX :
+                direction[0] < 0 ? polygon.minX : polygon.minY,
+            max = -Infinity,
+            value;
+        while ((value = dot(polygon[index], direction)) > max) {
+            max = value;
+            index = ++index % polygon.length;
+        }
+        return polygon[(index || polygon.length) - 1];
+    }
+};
+
+function processSimplex(simplex, direction) {
+    /* jshint -W004 */
+
+    // we only need to handle to 1-simplex and 2-simplex
+    if (simplex.length == 2) { // 1-simplex
+        var a = simplex[1],
+            b = simplex[0],
+            AO = minus(simplex[1]),
+            AB = sub(b, a);
+        // AO is in the same direction as AB
+        if (dot(AO, AB) > 0) {
+            // get the vector perpendicular to AB facing O
+            set(direction, orth(AB, a));
+        } else {
+            set(direction, AO);
+            // only A remains in the simplex
+            simplex.shift();
+        }
+    } else { // 2-simplex
+        var a = simplex[2], // [a, b, c] = simplex
+            b = simplex[1],
+            c = simplex[0],
+            AB = sub(b, a),
+            AC = sub(c, a),
+            AO = minus(a),
+            ACB = orth(AB, AC), // the vector perpendicular to AB facing away from C
+            ABC = orth(AC, AB); // the vector perpendicular to AC facing away from B
+
+        if (dot(ACB, AO) > 0) {
+            if (dot(AB, AO) > 0) { // region 4
+                set(direction, ACB);
+                simplex.shift(); // simplex = [b, a]
+            } else { // region 5
+                set(direction, AO);
+                simplex.splice(0, 2); // simplex = [a]
+            }
+        } else if (dot(ABC, AO) > 0) {
+            if (dot(AC, AO) > 0) { // region 6
+                set(direction, ABC);
+                simplex.splice(1, 1); // simplex = [c, a]
+            } else { // region 5 (again)
+                set(direction, AO);
+                simplex.splice(0, 2); // simplex = [a]
+            }
+        } else // region 7
+            return true;
+    }
+    return false;
+}
+
+function minus(v) {
+    return [-v[0], -v[1]];
+}
+
+function sub(v1, v2) {
+    return [v1[0] - v2[0], v1[1] - v2[1]];
+}
+
+function dot(v1, v2) {
+    return v1[0] * v2[0] + v1[1] * v2[1];
+}
+
+function orth(v, from) {
+    var o = [-v[1], v[0]];
+    return dot(o, minus(from)) < 0 ? minus(o) : o;
+}
+
+function gatherPoints(points, item, index, path) {
+
+    var subPath = points.length && points[points.length - 1],
+        prev = index && path[index - 1],
+        basePoint = subPath.length && subPath[subPath.length - 1],
+        data = item.data,
+        ctrlPoint = basePoint;
+
+    switch (item.instruction) {
+        case 'M':
+            points.push(subPath = []);
+            break;
+        case 'H':
+            addPoint(subPath, [data[0], basePoint[1]]);
+            break;
+        case 'V':
+            addPoint(subPath, [basePoint[0], data[0]]);
+            break;
+        case 'Q':
+            addPoint(subPath, data.slice(0, 2));
+            prevCtrlPoint = [data[2] - data[0], data[3] - data[1]]; // Save control point for shorthand
+            break;
+        case 'T':
+            if (prev.instruction == 'Q' && prev.instruction == 'T') {
+                ctrlPoint = [basePoint[0] + prevCtrlPoint[0], basePoint[1] + prevCtrlPoint[1]];
+                addPoint(subPath, ctrlPoint);
+                prevCtrlPoint = [data[0] - ctrlPoint[0], data[1] - ctrlPoint[1]];
+            }
+            break;
+        case 'C':
+            // Approximate quibic Bezier curve with middle points between control points
+            addPoint(subPath, [.5 * (basePoint[0] + data[0]), .5 * (basePoint[1] + data[1])]);
+            addPoint(subPath, [.5 * (data[0] + data[2]), .5 * (data[1] + data[3])]);
+            addPoint(subPath, [.5 * (data[2] + data[4]), .5 * (data[3] + data[5])]);
+            prevCtrlPoint = [data[4] - data[2], data[5] - data[3]]; // Save control point for shorthand
+            break;
+        case 'S':
+            if (prev.instruction == 'C' && prev.instruction == 'S') {
+                addPoint(subPath, [basePoint[0] + .5 * prevCtrlPoint[0], basePoint[1] + .5 * prevCtrlPoint[1]]);
+                ctrlPoint = [basePoint[0] + prevCtrlPoint[0], basePoint[1] + prevCtrlPoint[1]];
+            }
+            addPoint(subPath, [.5 * (ctrlPoint[0] + data[0]), .5 * (ctrlPoint[1]+ data[1])]);
+            addPoint(subPath, [.5 * (data[0] + data[2]), .5 * (data[1] + data[3])]);
+            prevCtrlPoint = [data[2] - data[0], data[3] - data[1]];
+            break;
+        case 'A':
+            // Convert the arc to bezier curves and use the same approximation
+            var curves = a2c.apply(0, basePoint.concat(data));
+            for (var cData; (cData = curves.splice(0,6).map(toAbsolute)).length;) {
+                addPoint(subPath, [.5 * (basePoint[0] + cData[0]), .5 * (basePoint[1] + cData[1])]);
+                addPoint(subPath, [.5 * (cData[0] + cData[2]), .5 * (cData[1] + cData[3])]);
+                addPoint(subPath, [.5 * (cData[2] + cData[4]), .5 * (cData[3] + cData[5])]);
+                if (curves.length) addPoint(subPath, basePoint = cData.slice(-2));
+            }
+            break;
+    }
+    // Save final command coordinates
+    if (data && data.length >= 2) addPoint(subPath, data.slice(-2));
+    return points;
+
+    function toAbsolute(n, i) { return n + basePoint[i % 2] }
+
+    // Writes data about the extreme points on each axle
+    function addPoint(path, point) {
+        if (!path.length || point[1] > path[path.maxY][1]) {
+            path.maxY = path.length;
+            points.maxY = points.length ? Math.max(point[1], points.maxY) : point[1];
+        }
+        if (!path.length || point[0] > path[path.maxX][0]) {
+            path.maxX = path.length;
+            points.maxX = points.length ? Math.max(point[0], points.maxX) : point[0];
+        }
+        if (!path.length || point[1] < path[path.minY][1]) {
+            path.minY = path.length;
+            points.minY = points.length ? Math.min(point[1], points.minY) : point[1];
+        }
+        if (!path.length || point[0] < path[path.minX][0]) {
+            path.minX = path.length;
+            points.minX = points.length ? Math.min(point[0], points.minX) : point[0];
+        }
+        path.push(point);
+    }
+}
+
+/**
+ * Forms a convex hull from set of points of every subpath using monotone chain convex hull algorithm.
+ * http://en.wikibooks.org/wiki/Algorithm_Implementation/Geometry/Convex_hull/Monotone_chain
+ *
+ * @param points An array of [X, Y] coordinates
+ */
+function convexHull(points) {
+    /* jshint -W004 */
+
+    points.sort(function(a, b) {
+        return a[0] == b[0] ? a[1] - b[1] : a[0] - b[0];
+    });
+
+    var lower = [],
+        minY = 0,
+        bottom = 0;
+    for (var i = 0; i < points.length; i++) {
+        while (lower.length >= 2 && cross(lower[lower.length - 2], lower[lower.length - 1], points[i]) <= 0) {
+            lower.pop();
+        }
+        if (points[i][1] < points[minY][1]) {
+            minY = i;
+            bottom = lower.length;
+        }
+        lower.push(points[i]);
+    }
+
+    var upper = [],
+        maxY = points.length - 1,
+        top = 0;
+    for (var i = points.length; i--;) {
+        while (upper.length >= 2 && cross(upper[upper.length - 2], upper[upper.length - 1], points[i]) <= 0) {
+            upper.pop();
+        }
+        if (points[i][1] > points[maxY][1]) {
+            maxY = i;
+            top = upper.length;
+        }
+        upper.push(points[i]);
+    }
+
+    // last points are equal to starting points of the other part
+    upper.pop();
+    lower.pop();
+
+    var hull = lower.concat(upper);
+
+    hull.minX = 0; // by sorting
+    hull.maxX = lower.length;
+    hull.minY = bottom;
+    hull.maxY = (lower.length + top) % hull.length;
+
+    return hull;
+}
+
+function cross(o, a, b) {
+    return (a[0] - o[0]) * (b[1] - o[1]) - (a[1] - o[1]) * (b[0] - o[0]);
+}
+
+/* Based on code from Snap.svg (Apache 2 license). http://snapsvg.io/
+ * Thanks to Dmitry Baranovskiy for his great work!
+ */
+
+// jshint ignore: start
+function a2c(x1, y1, rx, ry, angle, large_arc_flag, sweep_flag, x2, y2, recursive) {
+    // for more information of where this Math came from visit:
+    // http://www.w3.org/TR/SVG11/implnote.html#ArcImplementationNotes
+    var _120 = Math.PI * 120 / 180,
+        rad = Math.PI / 180 * (+angle || 0),
+        res = [],
+        rotateX = function(x, y, rad) { return x * Math.cos(rad) - y * Math.sin(rad) },
+        rotateY = function(x, y, rad) { return x * Math.sin(rad) + y * Math.cos(rad) };
+    if (!recursive) {
+        x1 = rotateX(x1, y1, -rad);
+        y1 = rotateY(x1, y1, -rad);
+        x2 = rotateX(x2, y2, -rad);
+        y2 = rotateY(x2, y2, -rad);
+        var x = (x1 - x2) / 2,
+            y = (y1 - y2) / 2;
+        var h = (x * x) / (rx * rx) + (y * y) / (ry * ry);
+        if (h > 1) {
+            h = Math.sqrt(h);
+            rx = h * rx;
+            ry = h * ry;
+        }
+        var rx2 = rx * rx,
+            ry2 = ry * ry,
+            k = (large_arc_flag == sweep_flag ? -1 : 1) *
+                Math.sqrt(Math.abs((rx2 * ry2 - rx2 * y * y - ry2 * x * x) / (rx2 * y * y + ry2 * x * x))),
+            cx = k * rx * y / ry + (x1 + x2) / 2,
+            cy = k * -ry * x / rx + (y1 + y2) / 2,
+            f1 = Math.asin(((y1 - cy) / ry).toFixed(9)),
+            f2 = Math.asin(((y2 - cy) / ry).toFixed(9));
+
+        f1 = x1 < cx ? Math.PI - f1 : f1;
+        f2 = x2 < cx ? Math.PI - f2 : f2;
+        f1 < 0 && (f1 = Math.PI * 2 + f1);
+        f2 < 0 && (f2 = Math.PI * 2 + f2);
+        if (sweep_flag && f1 > f2) {
+            f1 = f1 - Math.PI * 2;
+        }
+        if (!sweep_flag && f2 > f1) {
+            f2 = f2 - Math.PI * 2;
+        }
+    } else {
+        f1 = recursive[0];
+        f2 = recursive[1];
+        cx = recursive[2];
+        cy = recursive[3];
+    }
+    var df = f2 - f1;
+    if (Math.abs(df) > _120) {
+        var f2old = f2,
+            x2old = x2,
+            y2old = y2;
+        f2 = f1 + _120 * (sweep_flag && f2 > f1 ? 1 : -1);
+        x2 = cx + rx * Math.cos(f2);
+        y2 = cy + ry * Math.sin(f2);
+        res = a2c(x2, y2, rx, ry, angle, 0, sweep_flag, x2old, y2old, [f2, f2old, cx, cy]);
+    }
+    df = f2 - f1;
+    var c1 = Math.cos(f1),
+        s1 = Math.sin(f1),
+        c2 = Math.cos(f2),
+        s2 = Math.sin(f2),
+        t = Math.tan(df / 4),
+        hx = 4 / 3 * rx * t,
+        hy = 4 / 3 * ry * t,
+        m = [
+            - hx * s1, hy * c1,
+            x2 + hx * s2 - x1, y2 - hy * c2 - y1,
+            x2 - x1, y2 - y1
+        ];
+    if (recursive) {
+        return m.concat(res);
+    } else {
+        res = m.concat(res);
+        var newres = [];
+        for (var i = 0, n = res.length; i < n; i++) {
+            newres[i] = i % 2 ? rotateY(res[i - 1], res[i], rad) : rotateX(res[i], res[i + 1], rad);
+        }
+        return newres;
+    }
+}
+// jshint ignore: end
diff --git a/node_modules/svgo/plugins/_transforms.js b/node_modules/svgo/plugins/_transforms.js
new file mode 100644
index 00000000..796ca259
--- /dev/null
+++ b/node_modules/svgo/plugins/_transforms.js
@@ -0,0 +1,308 @@
+'use strict';
+
+var regTransformTypes = /matrix|translate|scale|rotate|skewX|skewY/,
+    regTransformSplit = /\s*(matrix|translate|scale|rotate|skewX|skewY)\s*\(\s*(.+?)\s*\)[\s,]*/,
+    regNumericValues = /[-+]?(?:\d*\.\d+|\d+\.?)(?:[eE][-+]?\d+)?/g;
+
+/**
+ * Convert transform string to JS representation.
+ *
+ * @param {String} transformString input string
+ * @param {Object} params plugin params
+ * @return {Array} output array
+ */
+exports.transform2js = function(transformString) {
+
+        // JS representation of the transform data
+    var transforms = [],
+        // current transform context
+        current;
+
+    // split value into ['', 'translate', '10 50', '', 'scale', '2', '', 'rotate', '-45', '']
+    transformString.split(regTransformSplit).forEach(function(item) {
+        /*jshint -W084 */
+        var num;
+
+        if (item) {
+            // if item is a translate function
+            if (regTransformTypes.test(item)) {
+                // then collect it and change current context
+                transforms.push(current = { name: item });
+            // else if item is data
+            } else {
+                // then split it into [10, 50] and collect as context.data
+                while (num = regNumericValues.exec(item)) {
+                    num = Number(num);
+                    if (current.data)
+                        current.data.push(num);
+                    else
+                        current.data = [num];
+                }
+            }
+        }
+    });
+
+    return transforms;
+
+};
+
+/**
+ * Multiply transforms into one.
+ *
+ * @param {Array} input transforms array
+ * @return {Array} output matrix array
+ */
+exports.transformsMultiply = function(transforms) {
+
+    // convert transforms objects to the matrices
+    transforms = transforms.map(function(transform) {
+        if (transform.name === 'matrix') {
+            return transform.data;
+        }
+        return transformToMatrix(transform);
+    });
+
+    // multiply all matrices into one
+    transforms = {
+        name: 'matrix',
+        data: transforms.reduce(function(a, b) {
+            return multiplyTransformMatrices(a, b);
+        })
+    };
+
+    return transforms;
+
+};
+
+/**
+ * Do math like a schoolgirl.
+ *
+ * @type {Object}
+ */
+var mth = exports.mth = {
+
+    rad: function(deg) {
+        return deg * Math.PI / 180;
+    },
+
+    deg: function(rad) {
+        return rad * 180 / Math.PI;
+    },
+
+    cos: function(deg) {
+        return Math.cos(this.rad(deg));
+    },
+
+    acos: function(val, floatPrecision) {
+        return +(this.deg(Math.acos(val)).toFixed(floatPrecision));
+    },
+
+    sin: function(deg) {
+        return Math.sin(this.rad(deg));
+    },
+
+    asin: function(val, floatPrecision) {
+        return +(this.deg(Math.asin(val)).toFixed(floatPrecision));
+    },
+
+    tan: function(deg) {
+        return Math.tan(this.rad(deg));
+    },
+
+    atan: function(val, floatPrecision) {
+        return +(this.deg(Math.atan(val)).toFixed(floatPrecision));
+    }
+
+};
+
+/**
+ * Decompose matrix into simple transforms. See
+ * http://www.maths-informatique-jeux.com/blog/frederic/?post/2013/12/01/Decomposition-of-2D-transform-matrices
+ *
+ * @param {Object} data matrix transform object
+ * @return {Object|Array} transforms array or original transform object
+ */
+exports.matrixToTransform = function(transform, params) {
+    var floatPrecision = params.floatPrecision,
+        data = transform.data,
+        transforms = [],
+        sx = +Math.sqrt(data[0] * data[0] + data[1] * data[1]).toFixed(params.transformPrecision),
+        sy = +((data[0] * data[3] - data[1] * data[2]) / sx).toFixed(params.transformPrecision),
+        colsSum = data[0] * data[2] + data[1] * data[3],
+        rowsSum = data[0] * data[1] + data[2] * data[3],
+        scaleBefore = rowsSum || +(sx == sy);
+
+    // [..., ..., ..., ..., tx, ty] → translate(tx, ty)
+    if (data[4] || data[5]) {
+        transforms.push({ name: 'translate', data: data.slice(4, data[5] ? 6 : 5) });
+    }
+
+    // [sx, 0, tan(a)·sy, sy, 0, 0] → skewX(a)·scale(sx, sy)
+    if (!data[1] && data[2]) {
+        transforms.push({ name: 'skewX', data: [mth.atan(data[2] / sy, floatPrecision)] });
+
+    // [sx, sx·tan(a), 0, sy, 0, 0] → skewY(a)·scale(sx, sy)
+    } else if (data[1] && !data[2]) {
+        transforms.push({ name: 'skewY', data: [mth.atan(data[1] / data[0], floatPrecision)] });
+        sx = data[0];
+        sy = data[3];
+
+    // [sx·cos(a), sx·sin(a), sy·-sin(a), sy·cos(a), x, y] → rotate(a[, cx, cy])·(scale or skewX) or
+    // [sx·cos(a), sy·sin(a), sx·-sin(a), sy·cos(a), x, y] → scale(sx, sy)·rotate(a[, cx, cy]) (if !scaleBefore)
+    } else if (!colsSum || (sx == 1 && sy == 1) || !scaleBefore) {
+        if (!scaleBefore) {
+            sx = (data[0] < 0 ? -1 : 1) * Math.sqrt(data[0] * data[0] + data[2] * data[2]);
+            sy = (data[3] < 0 ? -1 : 1) * Math.sqrt(data[1] * data[1] + data[3] * data[3]);
+            transforms.push({ name: 'scale', data: [sx, sy] });
+        }
+        var rotate = [mth.acos(data[0] / sx, floatPrecision) * (data[1] * sy < 0 ? -1 : 1)];
+
+        if (rotate[0]) transforms.push({ name: 'rotate', data: rotate });
+
+        if (rowsSum && colsSum) transforms.push({
+            name: 'skewX',
+            data: [mth.atan(colsSum / (sx * sx), floatPrecision)]
+        });
+
+        // rotate(a, cx, cy) can consume translate() within optional arguments cx, cy (rotation point)
+        if (rotate[0] && (data[4] || data[5])) {
+            transforms.shift();
+            var cos = data[0] / sx,
+                sin = data[1] / (scaleBefore ? sx : sy),
+                x = data[4] * (scaleBefore || sy),
+                y = data[5] * (scaleBefore || sx),
+                denom = (Math.pow(1 - cos, 2) + Math.pow(sin, 2)) * (scaleBefore || sx * sy);
+            rotate.push(((1 - cos) * x - sin * y) / denom);
+            rotate.push(((1 - cos) * y + sin * x) / denom);
+        }
+
+    // Too many transformations, return original matrix if it isn't just a scale/translate
+    } else if (data[1] || data[2]) {
+        return transform;
+    }
+
+    if (scaleBefore && (sx != 1 || sy != 1) || !transforms.length) transforms.push({
+        name: 'scale',
+        data: sx == sy ? [sx] : [sx, sy]
+    });
+
+    return transforms;
+};
+
+/**
+ * Convert transform to the matrix data.
+ *
+ * @param {Object} transform transform object
+ * @return {Array} matrix data
+ */
+function transformToMatrix(transform) {
+
+    if (transform.name === 'matrix') return transform.data;
+
+    var matrix;
+
+    switch (transform.name) {
+        case 'translate':
+            // [1, 0, 0, 1, tx, ty]
+            matrix = [1, 0, 0, 1, transform.data[0], transform.data[1] || 0];
+            break;
+        case 'scale':
+            // [sx, 0, 0, sy, 0, 0]
+            matrix = [transform.data[0], 0, 0, transform.data[1] || transform.data[0], 0, 0];
+            break;
+        case 'rotate':
+            // [cos(a), sin(a), -sin(a), cos(a), x, y]
+            var cos = mth.cos(transform.data[0]),
+                sin = mth.sin(transform.data[0]),
+                cx = transform.data[1] || 0,
+                cy = transform.data[2] || 0;
+
+            matrix = [cos, sin, -sin, cos, (1 - cos) * cx + sin * cy, (1 - cos) * cy - sin * cx];
+            break;
+        case 'skewX':
+            // [1, 0, tan(a), 1, 0, 0]
+            matrix = [1, 0, mth.tan(transform.data[0]), 1, 0, 0];
+            break;
+        case 'skewY':
+            // [1, tan(a), 0, 1, 0, 0]
+            matrix = [1, mth.tan(transform.data[0]), 0, 1, 0, 0];
+            break;
+    }
+
+    return matrix;
+
+}
+
+/**
+ * Applies transformation to an arc. To do so, we represent ellipse as a matrix, multiply it
+ * by the transformation matrix and use a singular value decomposition to represent in a form
+ * rotate(θ)·scale(a b)·rotate(φ). This gives us new ellipse params a, b and θ.
+ * SVD is being done with the formulae provided by Wolffram|Alpha (svd {{m0, m2}, {m1, m3}})
+ *
+ * @param {Array} arc [a, b, rotation in deg]
+ * @param {Array} transform transformation matrix
+ * @return {Array} arc transformed input arc
+ */
+exports.transformArc = function(arc, transform) {
+
+    var a = arc[0],
+        b = arc[1],
+        rot = arc[2] * Math.PI / 180,
+        cos = Math.cos(rot),
+        sin = Math.sin(rot),
+        h = Math.pow(arc[5] * cos + arc[6] * sin, 2) / (4 * a * a) +
+            Math.pow(arc[6] * cos - arc[5] * sin, 2) / (4 * b * b);
+    if (h > 1) {
+        h = Math.sqrt(h);
+        a *= h;
+        b *= h;
+    }
+    var ellipse = [a * cos, a * sin, -b * sin, b * cos, 0, 0],
+        m = multiplyTransformMatrices(transform, ellipse),
+        // Decompose the new ellipse matrix
+        lastCol = m[2] * m[2] + m[3] * m[3],
+        squareSum = m[0] * m[0] + m[1] * m[1] + lastCol,
+        root = Math.sqrt(
+            (Math.pow(m[0] - m[3], 2) + Math.pow(m[1] + m[2], 2)) *
+            (Math.pow(m[0] + m[3], 2) + Math.pow(m[1] - m[2], 2))
+        );
+
+    if (!root) { // circle
+        arc[0] = arc[1] = Math.sqrt(squareSum / 2);
+        arc[2] = 0;
+    } else {
+        var majorAxisSqr = (squareSum + root) / 2,
+            minorAxisSqr = (squareSum - root) / 2,
+            major = Math.abs(majorAxisSqr - lastCol) > 1e-6,
+            sub = (major ? majorAxisSqr : minorAxisSqr) - lastCol,
+            rowsSum = m[0] * m[2] + m[1] * m[3],
+            term1 = m[0] * sub + m[2] * rowsSum,
+            term2 = m[1] * sub + m[3] * rowsSum;
+        arc[0] = Math.sqrt(majorAxisSqr);
+        arc[1] = Math.sqrt(minorAxisSqr);
+        arc[2] = ((major ? term2 < 0 : term1 > 0) ? -1 : 1) *
+            Math.acos((major ? term1 : term2) / Math.sqrt(term1 * term1 + term2 * term2)) * 180 / Math.PI;
+    }
+    return arc;
+
+};
+
+/**
+ * Multiply transformation matrices.
+ *
+ * @param {Array} a matrix A data
+ * @param {Array} b matrix B data
+ * @return {Array} result
+ */
+function multiplyTransformMatrices(a, b) {
+
+    return [
+        a[0] * b[0] + a[2] * b[1],
+        a[1] * b[0] + a[3] * b[1],
+        a[0] * b[2] + a[2] * b[3],
+        a[1] * b[2] + a[3] * b[3],
+        a[0] * b[4] + a[2] * b[5] + a[4],
+        a[1] * b[4] + a[3] * b[5] + a[5]
+    ];
+
+}
diff --git a/node_modules/svgo/plugins/addAttributesToSVGElement.js b/node_modules/svgo/plugins/addAttributesToSVGElement.js
new file mode 100644
index 00000000..9b97c95c
--- /dev/null
+++ b/node_modules/svgo/plugins/addAttributesToSVGElement.js
@@ -0,0 +1,57 @@
+'use strict';
+
+exports.type = 'full';
+
+exports.active = false;
+
+exports.description = 'adds attributes to an outer <svg> element';
+
+var ENOCLS = 'Error in plugin "addAttributesToSVGElement": absent parameters.\n\
+It should have a list of classes in "attributes" or one "attribute".\n\
+Config example:\n\n\
+\
+plugins:\n\
+- addAttributesToSVGElement:\n\
+    attribute: "mySvg"\n\n\
+\
+plugins:\n\
+- addAttributesToSVGElement:\n\
+    attributes: ["mySvg", "size-big"]\n';
+
+/**
+ * Add attributes to an outer <svg> element. Example config:
+ *
+ * plugins:
+ * - addAttributesToSVGElement:
+ *     attribute: 'data-icon'
+ *
+ * plugins:
+ * - addAttributesToSVGElement:
+ *     attributes: ['data-icon', 'data-disabled']
+ *
+ * @author April Arcus
+ */
+exports.fn = function(data, params) {
+    if (!params || !(Array.isArray(params.attributes) && params.attributes.some(String) || params.attribute)) {
+        console.error(ENOCLS);
+        return data;
+    }
+
+    var attributes = params.attributes || [ params.attribute ],
+        svg = data.content[0];
+
+    if (svg.isElem('svg')) {
+        attributes.forEach(function (attribute) {
+            if (!svg.hasAttr(attribute)) {
+                svg.addAttr({
+                    name: attribute,
+                    prefix: '',
+                    local: attribute
+                });
+            }
+        });
+    }
+
+    return data;
+
+};
diff --git a/node_modules/svgo/plugins/addClassesToSVGElement.js b/node_modules/svgo/plugins/addClassesToSVGElement.js
new file mode 100644
index 00000000..3f9596aa
--- /dev/null
+++ b/node_modules/svgo/plugins/addClassesToSVGElement.js
@@ -0,0 +1,64 @@
+'use strict';
+
+exports.type = 'full';
+
+exports.active = false;
+
+exports.description = 'adds classnames to an outer <svg> element';
+
+var ENOCLS = 'Error in plugin "addClassesToSVGElement": absent parameters.\n\
+It should have a list of classes in "classNames" or one "className".\n\
+Config example:\n\n\
+\
+plugins:\n\
+- addClassesToSVGElement:\n\
+    className: "mySvg"\n\n\
+\
+plugins:\n\
+- addClassesToSVGElement:\n\
+    classNames: ["mySvg", "size-big"]\n';
+
+/**
+ * Add classnames to an outer <svg> element. Example config:
+ *
+ * plugins:
+ * - addClassesToSVGElement:
+ *     className: 'mySvg'
+ *
+ * plugins:
+ * - addClassesToSVGElement:
+ *     classNames: ['mySvg', 'size-big']
+ *
+ * @author April Arcus
+ */
+exports.fn = function(data, params) {
+    if (!params || !(Array.isArray(params.classNames) && params.classNames.some(String) || params.className)) {
+        console.error(ENOCLS);
+        return data;
+    }
+
+    var classNames = params.classNames || [ params.className ],
+        svg = data.content[0];
+
+    if (svg.isElem('svg')) {
+        if (svg.hasAttr('class')) {
+            var classes = svg.attr('class').value.split(' ');
+            classNames.forEach(function(className){
+                if (classes.indexOf(className) < 0) {
+                    classes.push(className);
+                }
+            });
+            svg.attr('class').value = classes.join(' ');
+        } else {
+            svg.addAttr({
+                name: 'class',
+                value: classNames.join(' '),
+                prefix: '',
+                local: 'class'
+            });
+        }
+    }
+
+    return data;
+
+};
diff --git a/node_modules/svgo/plugins/cleanupAttrs.js b/node_modules/svgo/plugins/cleanupAttrs.js
new file mode 100644
index 00000000..47e77ac7
--- /dev/null
+++ b/node_modules/svgo/plugins/cleanupAttrs.js
@@ -0,0 +1,56 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'cleanups attributes from newlines, trailing and repeating spaces';
+
+exports.params = {
+    newlines: true,
+    trim: true,
+    spaces: true
+};
+
+var regNewlinesNeedSpace = /(\S)\r?\n(\S)/g,
+    regNewlines = /\r?\n/g,
+    regSpaces = /\s{2,}/g;
+
+/**
+ * Cleanup attributes values from newlines, trailing and repeating spaces.
+ *
+ * @param {Object} item current iteration item
+ * @param {Object} params plugin params
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item, params) {
+
+    if (item.isElem()) {
+
+        item.eachAttr(function(attr) {
+
+            if (params.newlines) {
+                // new line which requires a space instead of themselve
+                attr.value = attr.value.replace(regNewlinesNeedSpace, function(match, p1, p2) {
+                    return p1 + ' ' + p2;
+                });
+
+                // simple new line
+                attr.value = attr.value.replace(regNewlines, '');
+            }
+
+            if (params.trim) {
+                attr.value = attr.value.trim();
+            }
+
+            if (params.spaces) {
+                attr.value = attr.value.replace(regSpaces, ' ');
+            }
+
+        });
+
+    }
+
+};
diff --git a/node_modules/svgo/plugins/cleanupEnableBackground.js b/node_modules/svgo/plugins/cleanupEnableBackground.js
new file mode 100644
index 00000000..e6384ab5
--- /dev/null
+++ b/node_modules/svgo/plugins/cleanupEnableBackground.js
@@ -0,0 +1,84 @@
+'use strict';
+
+exports.type = 'full';
+
+exports.active = true;
+
+exports.description = 'remove or cleanup enable-background attribute when possible';
+
+/**
+ * Remove or cleanup enable-background attr which coincides with a width/height box.
+ *
+ * @see http://www.w3.org/TR/SVG/filters.html#EnableBackgroundProperty
+ *
+ * @example
+ * <svg width="100" height="50" enable-background="new 0 0 100 50">
+ *             ⬇
+ * <svg width="100" height="50">
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(data) {
+
+    var regEnableBackground = /^new\s0\s0\s([\-+]?\d*\.?\d+([eE][\-+]?\d+)?)\s([\-+]?\d*\.?\d+([eE][\-+]?\d+)?)$/,
+        hasFilter = false,
+        elems = ['svg', 'mask', 'pattern'];
+
+    function checkEnableBackground(item) {
+        if (
+            item.isElem(elems) &&
+            item.hasAttr('enable-background') &&
+            item.hasAttr('width') &&
+            item.hasAttr('height')
+        ) {
+
+            var match = item.attr('enable-background').value.match(regEnableBackground);
+
+            if (match) {
+                if (
+                    item.attr('width').value === match[1] &&
+                    item.attr('height').value === match[3]
+                ) {
+                    if (item.isElem('svg')) {
+                        item.removeAttr('enable-background');
+                    } else {
+                        item.attr('enable-background').value = 'new';
+                    }
+                }
+            }
+
+        }
+    }
+
+    function checkForFilter(item) {
+        if (item.isElem('filter')) {
+            hasFilter = true;
+        }
+    }
+
+    function monkeys(items, fn) {
+        items.content.forEach(function(item) {
+            fn(item);
+
+            if (item.content) {
+                monkeys(item, fn);
+            }
+        });
+        return items;
+    }
+
+    var firstStep = monkeys(data, function(item) {
+        checkEnableBackground(item);
+        if (!hasFilter) {
+            checkForFilter(item);
+        }
+    });
+
+    return hasFilter ? firstStep : monkeys(firstStep, function(item) {
+            //we don't need 'enable-background' if we have no filters
+            item.removeAttr('enable-background');
+        });
+};
diff --git a/node_modules/svgo/plugins/cleanupIDs.js b/node_modules/svgo/plugins/cleanupIDs.js
new file mode 100644
index 00000000..38b5cfb4
--- /dev/null
+++ b/node_modules/svgo/plugins/cleanupIDs.js
@@ -0,0 +1,208 @@
+'use strict';
+
+exports.type = 'full';
+
+exports.active = true;
+
+exports.description = 'removes unused IDs and minifies used';
+
+exports.params = {
+    remove: true,
+    minify: true,
+    prefix: ''
+};
+
+var referencesProps = require('./_collections').referencesProps,
+    regReferencesUrl = /\burl\(("|')?#(.+?)\1\)/,
+    regReferencesHref = /^#(.+?)$/,
+    regReferencesBegin = /^(\w+?)\./,
+    styleOrScript = ['style', 'script'],
+    generateIDchars = [
+        'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
+    ],
+    maxIDindex = generateIDchars.length - 1;
+
+/**
+ * Remove unused and minify used IDs
+ * (only if there are no any <style> or <script>).
+ *
+ * @param {Object} item current iteration item
+ * @param {Object} params plugin params
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(data, params) {
+
+    var currentID,
+        currentIDstring,
+        IDs = Object.create(null),
+        referencesIDs = Object.create(null),
+        idPrefix = 'id-', // prefix IDs so that values like '__proto__' don't break the work
+        hasStyleOrScript = false;
+
+    /**
+     * Bananas!
+     *
+     * @param {Array} items input items
+     * @return {Array} output items
+     */
+    function monkeys(items) {
+
+        for (var i = 0; i < items.content.length && !hasStyleOrScript; i++) {
+
+            var item = items.content[i],
+                match;
+
+            // check if <style> of <script> presents
+            if (item.isElem(styleOrScript)) {
+                hasStyleOrScript = true;
+                continue;
+            }
+
+            // …and don't remove any ID if yes
+            if (item.isElem()) {
+
+                item.eachAttr(function(attr) {
+                    var key;
+                    // save IDs
+                    if (attr.name === 'id') {
+                        key = idPrefix + attr.value;
+                        if (key in IDs) {
+                            item.removeAttr('id');
+                        } else {
+                            IDs[key] = item;
+                        }
+                    }
+
+                    // save IDs url() references
+                    else if (referencesProps.indexOf(attr.name) > -1) {
+                        match = attr.value.match(regReferencesUrl);
+
+                        if (match) {
+                            key = idPrefix + match[2];
+                            if (referencesIDs[key]) {
+                                referencesIDs[key].push(attr);
+                            } else {
+                                referencesIDs[key] = [attr];
+                            }
+                        }
+                    }
+
+                    // save IDs href references
+                    else if (
+                        attr.local === 'href' && (match = attr.value.match(regReferencesHref)) ||
+                        attr.name === 'begin' && (match = attr.value.match(regReferencesBegin))
+                    ) {
+                        key = idPrefix + match[1];
+                        if (referencesIDs[key]) {
+                            referencesIDs[key].push(attr);
+                        } else {
+                            referencesIDs[key] = [attr];
+                        }
+                    }
+                });
+
+            }
+
+            // go deeper
+            if (item.content) {
+                monkeys(item);
+            }
+        }
+
+        return items;
+
+    }
+
+    data = monkeys(data);
+
+    if (hasStyleOrScript) {
+        return data;
+    }
+
+    var idKey;
+    for (var k in referencesIDs) {
+        if (IDs[k]) {
+            idKey = k;
+            k = k.replace(idPrefix, '');
+            // replace referenced IDs with the minified ones
+            if (params.minify) {
+                currentIDstring = getIDstring(currentID = generateID(currentID), params);
+                IDs[idKey].attr('id').value = currentIDstring;
+
+                referencesIDs[idKey].forEach(function(attr) {
+                    attr.value = attr.value
+                        .replace('#' + k, '#' + currentIDstring)
+                        .replace(k + '.', currentIDstring + '.');
+                });
+
+                idKey = idPrefix + k;
+            }
+
+            // don't remove referenced IDs
+            delete IDs[idKey];
+        }
+    }
+
+    // remove non-referenced IDs attributes from elements
+    if (params.remove) {
+
+        for(var ID in IDs) {
+            IDs[ID].removeAttr('id');
+        }
+
+    }
+
+    return data;
+
+};
+
+/**
+ * Generate unique minimal ID.
+ *
+ * @param {Array} [currentID] current ID
+ * @return {Array} generated ID array
+ */
+function generateID(currentID) {
+
+    if (!currentID) return [0];
+
+    currentID[currentID.length - 1]++;
+
+    for(var i = currentID.length - 1; i > 0; i--) {
+        if (currentID[i] > maxIDindex) {
+            currentID[i] = 0;
+
+            if (currentID[i - 1] !== undefined) {
+                currentID[i - 1]++;
+            }
+        }
+    }
+
+    if (currentID[0] > maxIDindex) {
+        currentID[0] = 0;
+        currentID.unshift(0);
+    }
+
+    return currentID;
+
+}
+
+/**
+ * Get string from generated ID array.
+ *
+ * @param {Array} arr input ID array
+ * @return {String} output ID string
+ */
+function getIDstring(arr, params) {
+
+    var str = params.prefix;
+
+    arr.forEach(function(i) {
+        str += generateIDchars[i];
+    });
+
+    return str;
+
+}
diff --git a/node_modules/svgo/plugins/cleanupListOfValues.js b/node_modules/svgo/plugins/cleanupListOfValues.js
new file mode 100644
index 00000000..e75944da
--- /dev/null
+++ b/node_modules/svgo/plugins/cleanupListOfValues.js
@@ -0,0 +1,141 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = false;
+
+exports.description = 'rounds list of values to the fixed precision';
+
+exports.params = {
+    floatPrecision: 3,
+    leadingZero: true,
+    defaultPx: true,
+    convertToPx: true
+};
+
+var regNumericValues = /^([\-+]?\d*\.?\d+([eE][\-+]?\d+)?)(px|pt|pc|mm|cm|m|in|ft|em|ex|%)?$/,
+    regSeparator = /\s+,?\s*|,\s*/,
+    removeLeadingZero = require('../lib/svgo/tools').removeLeadingZero,
+    absoluteLengths = { // relative to px
+        cm: 96/2.54,
+        mm: 96/25.4,
+        in: 96,
+        pt: 4/3,
+        pc: 16
+    };
+
+/**
+ * Round list of values to the fixed precision.
+ *
+ * @example
+ * <svg viewBox="0 0 200.28423 200.28423" enable-background="new 0 0 200.28423 200.28423">
+ *         ⬇
+ * <svg viewBox="0 0 200.284 200.284" enable-background="new 0 0 200.284 200.284">
+ *
+ *
+ * <polygon points="208.250977 77.1308594 223.069336 ... "/>
+ *         ⬇
+ * <polygon points="208.251 77.131 223.069 ... "/>
+ *
+ *
+ * @param {Object} item current iteration item
+ * @param {Object} params plugin params
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author kiyopikko
+ */
+exports.fn = function(item, params) {
+
+
+    if ( item.hasAttr('points') ) {
+        roundValues(item.attrs.points);
+    }
+
+    if ( item.hasAttr('enable-background') ) {
+        roundValues(item.attrs['enable-background']);
+    }
+
+    if ( item.hasAttr('viewBox') ) {
+        roundValues(item.attrs.viewBox);
+    }
+
+    if ( item.hasAttr('stroke-dasharray') ) {
+        roundValues(item.attrs['stroke-dasharray']);
+    }
+
+    if ( item.hasAttr('dx') ) {
+        roundValues(item.attrs.dx);
+    }
+
+    if ( item.hasAttr('dy') ) {
+        roundValues(item.attrs.dy);
+    }
+
+    if ( item.hasAttr('x') ) {
+        roundValues(item.attrs.x);
+    }
+
+    if ( item.hasAttr('y') ) {
+        roundValues(item.attrs.y);
+    }
+
+
+    function roundValues($prop){
+
+        var num, units,
+            match,
+            matchNew,
+            lists = $prop.value,
+            listsArr = lists.split(regSeparator),
+            roundedListArr = [],
+            roundedList;
+
+        listsArr.forEach(function(elem){
+
+            match = elem.match(regNumericValues);
+            matchNew = elem.match(/new/);
+
+             // if attribute value matches regNumericValues
+            if(match){
+
+                // round it to the fixed precision
+                num = +(+match[1]).toFixed(params.floatPrecision),
+                units = match[3] || '';
+
+                // convert absolute values to pixels
+                if (params.convertToPx && units && (units in absoluteLengths)) {
+                    var pxNum = +(absoluteLengths[units] * match[1]).toFixed(params.floatPrecision);
+
+                    if (String(pxNum).length < match[0].length)
+                        num = pxNum,
+                        units = 'px';
+                }
+
+                 // and remove leading zero
+                if (params.leadingZero) {
+                    num = removeLeadingZero(num);
+                }
+
+                // remove default 'px' units
+                if (params.defaultPx && units === 'px') {
+                    units = '';
+                }
+
+                roundedListArr.push(num+units);
+
+            }
+            // if attribute value is "new"(only enable-background).
+            else if(matchNew){
+
+                roundedListArr.push('new');
+
+            }
+
+        });
+
+        roundedList = roundedListArr.join(' ');
+        $prop.value = roundedList;
+
+    }
+
+};
diff --git a/node_modules/svgo/plugins/cleanupNumericValues.js b/node_modules/svgo/plugins/cleanupNumericValues.js
new file mode 100644
index 00000000..487443a5
--- /dev/null
+++ b/node_modules/svgo/plugins/cleanupNumericValues.js
@@ -0,0 +1,76 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'rounds numeric values to the fixed precision, removes default ‘px’ units';
+
+exports.params = {
+    floatPrecision: 3,
+    leadingZero: true,
+    defaultPx: true,
+    convertToPx: true
+};
+
+var regNumericValues = /^([\-+]?\d*\.?\d+([eE][\-+]?\d+)?)(px|pt|pc|mm|cm|m|in|ft|em|ex|%)?$/,
+    removeLeadingZero = require('../lib/svgo/tools').removeLeadingZero,
+    absoluteLengths = { // relative to px
+        cm: 96/2.54,
+        mm: 96/25.4,
+        in: 96,
+        pt: 4/3,
+        pc: 16
+    };
+
+/**
+ * Round numeric values to the fixed precision,
+ * remove default 'px' units.
+ *
+ * @param {Object} item current iteration item
+ * @param {Object} params plugin params
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item, params) {
+
+    if (item.isElem()) {
+
+        var match;
+
+        item.eachAttr(function(attr) {
+            match = attr.value.match(regNumericValues);
+
+            // if attribute value matches regNumericValues
+            if (match) {
+                // round it to the fixed precision
+                var num = +(+match[1]).toFixed(params.floatPrecision),
+                    units = match[3] || '';
+
+                // convert absolute values to pixels
+                if (params.convertToPx && units && (units in absoluteLengths)) {
+                    var pxNum = +(absoluteLengths[units] * match[1]).toFixed(params.floatPrecision);
+
+                    if (String(pxNum).length < match[0].length)
+                        num = pxNum,
+                        units = 'px';
+                }
+
+                // and remove leading zero
+                if (params.leadingZero) {
+                    num = removeLeadingZero(num);
+                }
+
+                // remove default 'px' units
+                if (params.defaultPx && units === 'px') {
+                    units = '';
+                }
+
+                attr.value = num + units;
+            }
+        });
+
+    }
+
+};
diff --git a/node_modules/svgo/plugins/collapseGroups.js b/node_modules/svgo/plugins/collapseGroups.js
new file mode 100644
index 00000000..adc97638
--- /dev/null
+++ b/node_modules/svgo/plugins/collapseGroups.js
@@ -0,0 +1,91 @@
+'use strict';
+
+exports.type = 'perItemReverse';
+
+exports.active = true;
+
+exports.description = 'collapses useless groups';
+
+var collections = require('./_collections'),
+    attrsInheritable = collections.inheritableAttrs,
+    animationElems = collections.elemsGroups.animation;
+
+function hasAnimatedAttr(item) {
+    /* jshint validthis:true */
+    return item.isElem(animationElems) && item.hasAttr('attributeName', this) ||
+        !item.isEmpty() && item.content.some(hasAnimatedAttr, this);
+}
+
+/*
+ * Collapse useless groups.
+ *
+ * @example
+ * <g>
+ *     <g attr1="val1">
+ *         <path d="..."/>
+ *     </g>
+ * </g>
+ *         ⬇
+ * <g>
+ *     <g>
+ *         <path attr1="val1" d="..."/>
+ *     </g>
+ * </g>
+ *         ⬇
+ * <path attr1="val1" d="..."/>
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item) {
+
+    // non-empty elements
+    if (item.isElem() && !item.isElem('switch') && !item.isEmpty()) {
+
+        item.content.forEach(function(g, i) {
+
+            // non-empty groups
+            if (g.isElem('g') && !g.isEmpty()) {
+
+                // move group attibutes to the single content element
+                if (g.hasAttr() && g.content.length === 1) {
+                    var inner = g.content[0];
+
+                    if (inner.isElem() && !inner.hasAttr('id') &&
+                        !(g.hasAttr('class') && inner.hasAttr('class')) && (
+                            !g.hasAttr('clip-path') && !g.hasAttr('mask') ||
+                            inner.isElem('g') && !g.hasAttr('transform') && !inner.hasAttr('transform')
+                        )
+                    ) {
+                        g.eachAttr(function(attr) {
+                            if (g.content.some(hasAnimatedAttr, attr.name)) return;
+
+                            if (!inner.hasAttr(attr.name)) {
+                                inner.addAttr(attr);
+                            } else if (attr.name == 'transform') {
+                                inner.attr(attr.name).value = attr.value + ' ' + inner.attr(attr.name).value;
+                            } else if (
+                                attrsInheritable.indexOf(attr.name) < 0 &&
+                                !inner.hasAttr(attr.name, attr.value)
+                            ) {
+                                return;
+                            }
+
+                            g.removeAttr(attr.name);
+                        });
+                    }
+                }
+
+                // collapse groups without attributes
+                if (!g.hasAttr() && !g.content.some(function(item) { return item.isElem(animationElems) })) {
+                    item.spliceContent(i, 1, g.content);
+                }
+            }
+
+        });
+
+    }
+
+};
diff --git a/node_modules/svgo/plugins/convertColors.js b/node_modules/svgo/plugins/convertColors.js
new file mode 100644
index 00000000..b856e130
--- /dev/null
+++ b/node_modules/svgo/plugins/convertColors.js
@@ -0,0 +1,127 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'converts colors: rgb() to #rrggbb and #rrggbb to #rgb';
+
+exports.params = {
+    currentColor: false,
+    names2hex: true,
+    rgb2hex: true,
+    shorthex: true,
+    shortname: true
+};
+
+var collections = require('./_collections'),
+    rNumber = '([+-]?(?:\\d*\\.\\d+|\\d+\\.?)%?)',
+    rComma = '\\s*,\\s*',
+    regRGB = new RegExp('^rgb\\(\\s*' + rNumber + rComma + rNumber + rComma + rNumber + '\\s*\\)$'),
+    regHEX = /^\#(([a-fA-F0-9])\2){3}$/,
+    none = /\bnone\b/i;
+
+/**
+ * Convert different colors formats in element attributes to hex.
+ *
+ * @see http://www.w3.org/TR/SVG/types.html#DataTypeColor
+ * @see http://www.w3.org/TR/SVG/single-page.html#types-ColorKeywords
+ *
+ * @example
+ * Convert color name keyword to long hex:
+ * fuchsia ➡ #ff00ff
+ *
+ * Convert rgb() to long hex:
+ * rgb(255, 0, 255) ➡ #ff00ff
+ * rgb(50%, 100, 100%) ➡ #7f64ff
+ *
+ * Convert long hex to short hex:
+ * #aabbcc ➡ #abc
+ *
+ * Convert hex to short name
+ * #000080 ➡ navy
+ *
+ * @param {Object} item current iteration item
+ * @param {Object} params plugin params
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item, params) {
+
+    if (item.elem) {
+
+        item.eachAttr(function(attr) {
+
+            if (collections.colorsProps.indexOf(attr.name) > -1) {
+
+                var val = attr.value,
+                    match;
+
+                // Convert colors to currentColor
+                if (params.currentColor) {
+                    if (typeof params.currentColor === 'string') {
+                        match = val === params.currentColor;
+                    } else if (params.currentColor.exec) {
+                        match = params.currentColor.exec(val);
+                    } else {
+                        match = !val.match(none);
+                    }
+                    if (match) {
+                        val = 'currentColor';
+                    }
+                }
+
+                // Convert color name keyword to long hex
+                if (params.names2hex && val.toLowerCase() in collections.colorsNames) {
+                    val = collections.colorsNames[val.toLowerCase()];
+                }
+
+                // Convert rgb() to long hex
+                if (params.rgb2hex && (match = val.match(regRGB))) {
+                    match = match.slice(1, 4).map(function(m) {
+                        if (m.indexOf('%') > -1)
+                            m = Math.round(parseFloat(m) * 2.55);
+
+                        return Math.max(0, Math.min(m, 255));
+                    });
+
+                    val = rgb2hex(match);
+                }
+
+                // Convert long hex to short hex
+                if (params.shorthex && (match = val.match(regHEX))) {
+                    val = '#' + match[0][1] + match[0][3] + match[0][5];
+                }
+
+                // Convert hex to short name
+                if (params.shortname && val in collections.colorsShortNames) {
+                    val = collections.colorsShortNames[val];
+                }
+
+                attr.value = val;
+
+            }
+
+        });
+
+    }
+
+};
+
+/**
+ * Convert [r, g, b] to #rrggbb.
+ *
+ * @see https://gist.github.com/983535
+ *
+ * @example
+ * rgb2hex([255, 255, 255]) // '#ffffff'
+ *
+ * @param {Array} rgb [r, g, b]
+ * @return {String} #rrggbb
+ *
+ * @author Jed Schmidt
+ */
+function rgb2hex(rgb) {
+    return '#' + ('00000' + (rgb[0] << 16 | rgb[1] << 8 | rgb[2]).toString(16)).slice(-6).toUpperCase();
+}
diff --git a/node_modules/svgo/plugins/convertPathData.js b/node_modules/svgo/plugins/convertPathData.js
new file mode 100644
index 00000000..c76a52c2
--- /dev/null
+++ b/node_modules/svgo/plugins/convertPathData.js
@@ -0,0 +1,957 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'optimizes path data: writes in shorter form, applies transformations';
+
+exports.params = {
+    applyTransforms: true,
+    applyTransformsStroked: true,
+    makeArcs: {
+        threshold: 2.5, // coefficient of rounding error
+        tolerance: 0.5  // percentage of radius
+    },
+    straightCurves: true,
+    lineShorthands: true,
+    curveSmoothShorthands: true,
+    floatPrecision: 3,
+    transformPrecision: 5,
+    removeUseless: true,
+    collapseRepeated: true,
+    utilizeAbsolute: true,
+    leadingZero: true,
+    negativeExtraSpace: true
+};
+
+var pathElems = require('./_collections.js').pathElems,
+    path2js = require('./_path.js').path2js,
+    js2path = require('./_path.js').js2path,
+    applyTransforms = require('./_path.js').applyTransforms,
+    cleanupOutData = require('../lib/svgo/tools').cleanupOutData,
+    roundData,
+    precision,
+    error,
+    arcThreshold,
+    arcTolerance,
+    hasMarkerMid;
+
+/**
+ * Convert absolute Path to relative,
+ * collapse repeated instructions,
+ * detect and convert Lineto shorthands,
+ * remove useless instructions like "l0,0",
+ * trim useless delimiters and leading zeros,
+ * decrease accuracy of floating-point numbers.
+ *
+ * @see http://www.w3.org/TR/SVG/paths.html#PathData
+ *
+ * @param {Object} item current iteration item
+ * @param {Object} params plugin params
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item, params) {
+
+    if (item.isElem(pathElems) && item.hasAttr('d')) {
+
+        precision = params.floatPrecision;
+        error = precision !== false ? +Math.pow(.1, precision).toFixed(precision) : 1e-2;
+        roundData = precision > 0 && precision < 20 ? strongRound : round;
+        if (params.makeArcs) {
+            arcThreshold = params.makeArcs.threshold;
+            arcTolerance = params.makeArcs.tolerance;
+        }
+        hasMarkerMid = item.hasAttr('marker-mid');
+
+        var data = path2js(item);
+
+        // TODO: get rid of functions returns
+        if (data.length) {
+            convertToRelative(data);
+
+            if (params.applyTransforms) {
+                data = applyTransforms(item, data, params);
+            }
+
+            data = filters(data, params);
+
+            if (params.utilizeAbsolute) {
+                data = convertToMixed(data, params);
+            }
+
+            js2path(item, data, params);
+        }
+
+    }
+
+};
+
+/**
+ * Convert absolute path data coordinates to relative.
+ *
+ * @param {Array} path input path data
+ * @param {Object} params plugin params
+ * @return {Array} output path data
+ */
+function convertToRelative(path) {
+
+    var point = [0, 0],
+        subpathPoint = [0, 0],
+        baseItem;
+
+    path.forEach(function(item, index) {
+
+        var instruction = item.instruction,
+            data = item.data;
+
+        // data !== !z
+        if (data) {
+
+            // already relative
+            // recalculate current point
+            if ('mcslqta'.indexOf(instruction) > -1) {
+
+                point[0] += data[data.length - 2];
+                point[1] += data[data.length - 1];
+
+                if (instruction === 'm') {
+                    subpathPoint[0] = point[0];
+                    subpathPoint[1] = point[1];
+                    baseItem = item;
+                }
+
+            } else if (instruction === 'h') {
+
+                point[0] += data[0];
+
+            } else if (instruction === 'v') {
+
+                point[1] += data[0];
+
+            }
+
+            // convert absolute path data coordinates to relative
+            // if "M" was not transformed from "m"
+            // M → m
+            if (instruction === 'M') {
+
+                if (index > 0) instruction = 'm';
+
+                data[0] -= point[0];
+                data[1] -= point[1];
+
+                subpathPoint[0] = point[0] += data[0];
+                subpathPoint[1] = point[1] += data[1];
+
+                baseItem = item;
+
+            }
+
+            // L → l
+            // T → t
+            else if ('LT'.indexOf(instruction) > -1) {
+
+                instruction = instruction.toLowerCase();
+
+                // x y
+                // 0 1
+                data[0] -= point[0];
+                data[1] -= point[1];
+
+                point[0] += data[0];
+                point[1] += data[1];
+
+            // C → c
+            } else if (instruction === 'C') {
+
+                instruction = 'c';
+
+                // x1 y1 x2 y2 x y
+                // 0  1  2  3  4 5
+                data[0] -= point[0];
+                data[1] -= point[1];
+                data[2] -= point[0];
+                data[3] -= point[1];
+                data[4] -= point[0];
+                data[5] -= point[1];
+
+                point[0] += data[4];
+                point[1] += data[5];
+
+            // S → s
+            // Q → q
+            } else if ('SQ'.indexOf(instruction) > -1) {
+
+                instruction = instruction.toLowerCase();
+
+                // x1 y1 x y
+                // 0  1  2 3
+                data[0] -= point[0];
+                data[1] -= point[1];
+                data[2] -= point[0];
+                data[3] -= point[1];
+
+                point[0] += data[2];
+                point[1] += data[3];
+
+            // A → a
+            } else if (instruction === 'A') {
+
+                instruction = 'a';
+
+                // rx ry x-axis-rotation large-arc-flag sweep-flag x y
+                // 0  1  2               3              4          5 6
+                data[5] -= point[0];
+                data[6] -= point[1];
+
+                point[0] += data[5];
+                point[1] += data[6];
+
+            // H → h
+            } else if (instruction === 'H') {
+
+                instruction = 'h';
+
+                data[0] -= point[0];
+
+                point[0] += data[0];
+
+            // V → v
+            } else if (instruction === 'V') {
+
+                instruction = 'v';
+
+                data[0] -= point[1];
+
+                point[1] += data[0];
+
+            }
+
+            item.instruction = instruction;
+            item.data = data;
+
+            // store absolute coordinates for later use
+            item.coords = point.slice(-2);
+
+        }
+
+        // !data === z, reset current point
+        else if (instruction == 'z') {
+            if (baseItem) {
+                item.coords = baseItem.coords;
+            }
+            point[0] = subpathPoint[0];
+            point[1] = subpathPoint[1];
+        }
+
+        item.base = index > 0 ? path[index - 1].coords : [0, 0];
+
+    });
+
+    return path;
+
+}
+
+/**
+ * Main filters loop.
+ *
+ * @param {Array} path input path data
+ * @param {Object} params plugin params
+ * @return {Array} output path data
+ */
+function filters(path, params) {
+
+    var stringify = data2Path.bind(null, params),
+        relSubpoint = [0, 0],
+        pathBase = [0, 0],
+        prev = {};
+
+    path = path.filter(function(item, index, path) {
+
+        var instruction = item.instruction,
+            data = item.data,
+            next = path[index + 1];
+
+        if (data) {
+
+            var sdata = data,
+                circle;
+
+            if (instruction === 's') {
+                sdata = [0, 0].concat(data);
+
+                if ('cs'.indexOf(prev.instruction) > -1) {
+                    var pdata = prev.data,
+                        n = pdata.length;
+
+                    // (-x, -y) of the prev tangent point relative to the current point
+                    sdata[0] = pdata[n - 2] - pdata[n - 4];
+                    sdata[1] = pdata[n - 1] - pdata[n - 3];
+                }
+
+            }
+
+            // convert curves to arcs if possible
+            if (
+                params.makeArcs &&
+                (instruction == 'c' || instruction == 's') &&
+                isConvex(sdata) &&
+                (circle = findCircle(sdata))
+            ) {
+                var r = roundData([circle.radius])[0],
+                    angle = findArcAngle(sdata, circle),
+                    sweep = sdata[5] * sdata[0] - sdata[4] * sdata[1] > 0 ? 1 : 0,
+                    arc = {
+                        instruction: 'a',
+                        data: [r, r, 0, 0, sweep, sdata[4], sdata[5]],
+                        coords: item.coords.slice(),
+                        base: item.base
+                    },
+                    output = [arc],
+                    // relative coordinates to adjust the found circle
+                    relCenter = [circle.center[0] - sdata[4], circle.center[1] - sdata[5]],
+                    relCircle = { center: relCenter, radius: circle.radius },
+                    arcCurves = [item],
+                    hasPrev = 0,
+                    suffix = '',
+                    nextLonghand;
+
+                if (
+                    prev.instruction == 'c' && isConvex(prev.data) && isArcPrev(prev.data, circle) ||
+                    prev.instruction == 'a' && prev.sdata && isArcPrev(prev.sdata, circle)
+                ) {
+                    arcCurves.unshift(prev);
+                    arc.base = prev.base;
+                    arc.data[5] = arc.coords[0] - arc.base[0];
+                    arc.data[6] = arc.coords[1] - arc.base[1];
+                    var prevData = prev.instruction == 'a' ? prev.sdata : prev.data;
+                    angle += findArcAngle(prevData,
+                        {
+                            center: [prevData[4] + relCenter[0], prevData[5] + relCenter[1]],
+                            radius: circle.radius
+                        }
+                    );
+                    if (angle > Math.PI) arc.data[3] = 1;
+                    hasPrev = 1;
+                }
+
+                // check if next curves are fitting the arc
+                for (var j = index; (next = path[++j]) && ~'cs'.indexOf(next.instruction);) {
+                    var nextData = next.data;
+                    if (next.instruction == 's') {
+                        nextLonghand = makeLonghand({instruction: 's', data: next.data.slice() },
+                            path[j - 1].data);
+                        nextData = nextLonghand.data;
+                        nextLonghand.data = nextData.slice(0, 2);
+                        suffix = stringify([nextLonghand]);
+                    }
+                    if (isConvex(nextData) && isArc(nextData, relCircle)) {
+                        angle += findArcAngle(nextData, relCircle);
+                        if (angle - 2 * Math.PI > 1e-3) break; // more than 360°
+                        if (angle > Math.PI) arc.data[3] = 1;
+                        arcCurves.push(next);
+                        if (2 * Math.PI - angle > 1e-3) { // less than 360°
+                            arc.coords = next.coords;
+                            arc.data[5] = arc.coords[0] - arc.base[0];
+                            arc.data[6] = arc.coords[1] - arc.base[1];
+                        } else {
+                            // full circle, make a half-circle arc and add a second one
+                            arc.data[5] = 2 * (relCircle.center[0] - nextData[4]);
+                            arc.data[6] = 2 * (relCircle.center[1] - nextData[5]);
+                            arc.coords = [arc.base[0] + arc.data[5], arc.base[1] + arc.data[6]];
+                            arc = {
+                                instruction: 'a',
+                                data: [r, r, 0, 0, sweep,
+                                    next.coords[0] - arc.coords[0], next.coords[1] - arc.coords[1]],
+                                coords: next.coords,
+                                base: arc.coords
+                            };
+                            output.push(arc);
+                            j++;
+                            break;
+                        }
+                        relCenter[0] -= nextData[4];
+                        relCenter[1] -= nextData[5];
+                    } else break;
+                }
+
+                if ((stringify(output) + suffix).length < stringify(arcCurves).length) {
+                    if (path[j] && path[j].instruction == 's') {
+                        makeLonghand(path[j], path[j - 1].data);
+                    }
+                    if (hasPrev) {
+                        var prevArc = output.shift();
+                        roundData(prevArc.data);
+                        relSubpoint[0] += prevArc.data[5] - prev.data[prev.data.length - 2];
+                        relSubpoint[1] += prevArc.data[6] - prev.data[prev.data.length - 1];
+                        prev.instruction = 'a';
+                        prev.data = prevArc.data;
+                        item.base = prev.coords = prevArc.coords;
+                    }
+                    arc = output.shift();
+                    if (arcCurves.length == 1) {
+                        item.sdata = sdata.slice(); // preserve curve data for future checks
+                    } else if (arcCurves.length - 1 - hasPrev > 0) {
+                        // filter out consumed next items
+                        path.splice.apply(path, [index + 1, arcCurves.length - 1 - hasPrev].concat(output));
+                    }
+                    if (!arc) return false;
+                    instruction = 'a';
+                    data = arc.data;
+                    item.coords = arc.coords;
+                }
+            }
+
+            // Rounding relative coordinates, taking in account accummulating error
+            // to get closer to absolute coordinates. Sum of rounded value remains same:
+            // l .25 3 .25 2 .25 3 .25 2 -> l .3 3 .2 2 .3 3 .2 2
+            if (precision !== false) {
+                if ('mltqsc'.indexOf(instruction) > -1) {
+                    for (var i = data.length; i--;) {
+                        data[i] += item.base[i % 2] - relSubpoint[i % 2];
+                    }
+                } else if (instruction == 'h') {
+                    data[0] += item.base[0] - relSubpoint[0];
+                } else if (instruction == 'v') {
+                    data[0] += item.base[1] - relSubpoint[1];
+                } else if (instruction == 'a') {
+                    data[5] += item.base[0] - relSubpoint[0];
+                    data[6] += item.base[1] - relSubpoint[1];
+                }
+                roundData(data);
+
+                if      (instruction == 'h') relSubpoint[0] += data[0];
+                else if (instruction == 'v') relSubpoint[1] += data[0];
+                else {
+                    relSubpoint[0] += data[data.length - 2];
+                    relSubpoint[1] += data[data.length - 1];
+                }
+                roundData(relSubpoint);
+
+                if (instruction.toLowerCase() == 'm') {
+                    pathBase[0] = relSubpoint[0];
+                    pathBase[1] = relSubpoint[1];
+                }
+            }
+
+            // convert straight curves into lines segments
+            if (params.straightCurves) {
+
+                if (
+                    instruction === 'c' &&
+                    isCurveStraightLine(data) ||
+                    instruction === 's' &&
+                    isCurveStraightLine(sdata)
+                ) {
+                    if (next && next.instruction == 's')
+                        makeLonghand(next, data); // fix up next curve
+                    instruction = 'l';
+                    data = data.slice(-2);
+                }
+
+                else if (
+                    instruction === 'q' &&
+                    isCurveStraightLine(data)
+                ) {
+                    if (next && next.instruction == 't')
+                        makeLonghand(next, data); // fix up next curve
+                    instruction = 'l';
+                    data = data.slice(-2);
+                }
+
+                else if (
+                    instruction === 't' &&
+                    prev.instruction !== 'q' &&
+                    prev.instruction !== 't'
+                ) {
+                    instruction = 'l';
+                    data = data.slice(-2);
+                }
+
+                else if (
+                    instruction === 'a' &&
+                    (data[0] === 0 || data[1] === 0)
+                ) {
+                    instruction = 'l';
+                    data = data.slice(-2);
+                }
+            }
+
+            // horizontal and vertical line shorthands
+            // l 50 0 → h 50
+            // l 0 50 → v 50
+            if (
+                params.lineShorthands &&
+                instruction === 'l'
+            ) {
+                if (data[1] === 0) {
+                    instruction = 'h';
+                    data.pop();
+                } else if (data[0] === 0) {
+                    instruction = 'v';
+                    data.shift();
+                }
+            }
+
+            // collapse repeated commands
+            // h 20 h 30 -> h 50
+            if (
+                params.collapseRepeated &&
+                !hasMarkerMid &&
+                ('mhv'.indexOf(instruction) > -1) &&
+                prev.instruction &&
+                instruction == prev.instruction.toLowerCase() &&
+                (
+                    (instruction != 'h' && instruction != 'v') ||
+                    (prev.data[0] >= 0) == (item.data[0] >= 0)
+            )) {
+                prev.data[0] += data[0];
+                if (instruction != 'h' && instruction != 'v') {
+                    prev.data[1] += data[1];
+                }
+                prev.coords = item.coords;
+                path[index] = prev;
+                return false;
+            }
+
+            // convert curves into smooth shorthands
+            if (params.curveSmoothShorthands && prev.instruction) {
+
+                // curveto
+                if (instruction === 'c') {
+
+                    // c + c → c + s
+                    if (
+                        prev.instruction === 'c' &&
+                        data[0] === -(prev.data[2] - prev.data[4]) &&
+                        data[1] === -(prev.data[3] - prev.data[5])
+                    ) {
+                        instruction = 's';
+                        data = data.slice(2);
+                    }
+
+                    // s + c → s + s
+                    else if (
+                        prev.instruction === 's' &&
+                        data[0] === -(prev.data[0] - prev.data[2]) &&
+                        data[1] === -(prev.data[1] - prev.data[3])
+                    ) {
+                        instruction = 's';
+                        data = data.slice(2);
+                    }
+
+                    // [^cs] + c → [^cs] + s
+                    else if (
+                        'cs'.indexOf(prev.instruction) === -1 &&
+                        data[0] === 0 &&
+                        data[1] === 0
+                    ) {
+                        instruction = 's';
+                        data = data.slice(2);
+                    }
+
+                }
+
+                // quadratic Bézier curveto
+                else if (instruction === 'q') {
+
+                    // q + q → q + t
+                    if (
+                        prev.instruction === 'q' &&
+                        data[0] === (prev.data[2] - prev.data[0]) &&
+                        data[1] === (prev.data[3] - prev.data[1])
+                    ) {
+                        instruction = 't';
+                        data = data.slice(2);
+                    }
+
+                    // t + q → t + t
+                    else if (
+                        prev.instruction === 't' &&
+                        data[2] === prev.data[0] &&
+                        data[3] === prev.data[1]
+                    ) {
+                        instruction = 't';
+                        data = data.slice(2);
+                    }
+
+                }
+
+            }
+
+            // remove useless non-first path segments
+            if (params.removeUseless) {
+
+                // l 0,0 / h 0 / v 0 / q 0,0 0,0 / t 0,0 / c 0,0 0,0 0,0 / s 0,0 0,0
+                if (
+                    (
+                     'lhvqtcs'.indexOf(instruction) > -1
+                    ) &&
+                    data.every(function(i) { return i === 0; })
+                ) {
+                    path[index] = prev;
+                    return false;
+                }
+
+                // a 25,25 -30 0,1 0,0
+                if (
+                    instruction === 'a' &&
+                    data[5] === 0 &&
+                    data[6] === 0
+                ) {
+                    path[index] = prev;
+                    return false;
+                }
+
+            }
+
+            item.instruction = instruction;
+            item.data = data;
+
+            prev = item;
+
+        } else {
+
+            // z resets coordinates
+            relSubpoint[0] = pathBase[0];
+            relSubpoint[1] = pathBase[1];
+            if (prev.instruction == 'z') return false;
+            prev = item;
+
+        }
+
+        return true;
+
+    });
+
+    return path;
+
+}
+
+/**
+ * Writes data in shortest form using absolute or relative coordinates.
+ *
+ * @param {Array} data input path data
+ * @return {Boolean} output
+ */
+function convertToMixed(path, params) {
+
+    var prev = path[0];
+
+    path = path.filter(function(item, index) {
+
+        if (index == 0) return true;
+        if (!item.data) {
+            prev = item;
+            return true;
+        }
+
+        var instruction = item.instruction,
+            data = item.data,
+            adata = data && data.slice(0);
+
+        if ('mltqsc'.indexOf(instruction) > -1) {
+            for (var i = adata.length; i--;) {
+                adata[i] += item.base[i % 2];
+            }
+        } else if (instruction == 'h') {
+                adata[0] += item.base[0];
+        } else if (instruction == 'v') {
+                adata[0] += item.base[1];
+        } else if (instruction == 'a') {
+                adata[5] += item.base[0];
+                adata[6] += item.base[1];
+        }
+
+        roundData(adata);
+
+        var absoluteDataStr = cleanupOutData(adata, params),
+            relativeDataStr = cleanupOutData(data, params);
+
+        // Convert to absolute coordinates if it's shorter.
+        // v-20 -> V0
+        // Don't convert if it fits following previous instruction.
+        // l20 30-10-50 instead of l20 30L20 30
+        if (
+            absoluteDataStr.length < relativeDataStr.length &&
+            !(
+                params.negativeExtraSpace &&
+                instruction == prev.instruction &&
+                prev.instruction.charCodeAt(0) > 96 &&
+                absoluteDataStr.length == relativeDataStr.length - 1 &&
+                (data[0] < 0 || /^0\./.test(data[0]) && prev.data[prev.data.length - 1] % 1)
+            )
+        ) {
+            item.instruction = instruction.toUpperCase();
+            item.data = adata;
+        }
+
+        prev = item;
+
+        return true;
+
+    });
+
+    return path;
+
+}
+
+/**
+ * Checks if curve is convex. Control points of such a curve must form
+ * a convex quadrilateral with diagonals crosspoint inside of it.
+ *
+ * @param {Array} data input path data
+ * @return {Boolean} output
+ */
+function isConvex(data) {
+
+    var center = getIntersection([0, 0, data[2], data[3], data[0], data[1], data[4], data[5]]);
+
+    return center &&
+        (data[2] < center[0] == center[0] < 0) &&
+        (data[3] < center[1] == center[1] < 0) &&
+        (data[4] < center[0] == center[0] < data[0]) &&
+        (data[5] < center[1] == center[1] < data[1]);
+
+}
+
+/**
+ * Computes lines equations by two points and returns their intersection point.
+ *
+ * @param {Array} coords 8 numbers for 4 pairs of coordinates (x,y)
+ * @return {Array|undefined} output coordinate of lines' crosspoint
+ */
+function getIntersection(coords) {
+
+        // Prev line equation parameters.
+    var a1 = coords[1] - coords[3], // y1 - y2
+        b1 = coords[2] - coords[0], // x2 - x1
+        c1 = coords[0] * coords[3] - coords[2] * coords[1], // x1 * y2 - x2 * y1
+
+        // Next line equation parameters
+        a2 = coords[5] - coords[7], // y1 - y2
+        b2 = coords[6] - coords[4], // x2 - x1
+        c2 = coords[4] * coords[7] - coords[5] * coords[6], // x1 * y2 - x2 * y1
+        denom = (a1 * b2 - a2 * b1);
+
+    if (!denom) return; // parallel lines havn't an intersection
+
+    var cross = [
+            (b1 * c2 - b2 * c1) / denom,
+            (a1 * c2 - a2 * c1) / -denom
+        ];
+    if (
+        !isNaN(cross[0]) && !isNaN(cross[1]) &&
+        isFinite(cross[0]) && isFinite(cross[1])
+    ) {
+        return cross;
+    }
+
+}
+
+/**
+ * Decrease accuracy of floating-point numbers
+ * in path data keeping a specified number of decimals.
+ * Smart rounds values like 2.3491 to 2.35 instead of 2.349.
+ * Doesn't apply "smartness" if the number precision fits already.
+ *
+ * @param {Array} data input data array
+ * @return {Array} output data array
+ */
+function strongRound(data) {
+    for (var i = data.length; i-- > 0;) {
+        if (data[i].toFixed(precision) != data[i]) {
+            var rounded = +data[i].toFixed(precision - 1);
+            data[i] = +Math.abs(rounded - data[i]).toFixed(precision + 1) >= error ?
+                +data[i].toFixed(precision) :
+                rounded;
+        }
+    }
+    return data;
+}
+
+/**
+ * Simple rounding function if precision is 0.
+ *
+ * @param {Array} data input data array
+ * @return {Array} output data array
+ */
+function round(data) {
+    for (var i = data.length; i-- > 0;) {
+        data[i] = Math.round(data[i]);
+    }
+    return data;
+}
+
+/**
+ * Checks if a curve is a straight line by measuring distance
+ * from middle points to the line formed by end points.
+ *
+ * @param {Array} xs array of curve points x-coordinates
+ * @param {Array} ys array of curve points y-coordinates
+ * @return {Boolean}
+ */
+
+function isCurveStraightLine(data) {
+
+    // Get line equation a·x + b·y + c = 0 coefficients a, b (c = 0) by start and end points.
+    var i = data.length - 2,
+        a = -data[i + 1], // y1 − y2 (y1 = 0)
+        b = data[i],      // x2 − x1 (x1 = 0)
+        d = 1 / (a * a + b * b); // same part for all points
+
+    if (i <= 1 || !isFinite(d)) return false; // curve that ends at start point isn't the case
+
+    // Distance from point (x0, y0) to the line is sqrt((c − a·x0 − b·y0)² / (a² + b²))
+    while ((i -= 2) >= 0) {
+        if (Math.sqrt(Math.pow(a * data[i] + b * data[i + 1], 2) * d) > error)
+            return false;
+    }
+
+    return true;
+
+}
+
+/**
+ * Converts next curve from shorthand to full form using the current curve data.
+ *
+ * @param {Object} item curve to convert
+ * @param {Array} data current curve data
+ */
+
+function makeLonghand(item, data) {
+    switch (item.instruction) {
+        case 's': item.instruction = 'c'; break;
+        case 't': item.instruction = 'q'; break;
+    }
+    item.data.unshift(data[data.length - 2] - data[data.length - 4], data[data.length - 1] - data[data.length - 3]);
+    return item;
+}
+
+/**
+ * Returns distance between two points
+ *
+ * @param {Array} point1 first point coordinates
+ * @param {Array} point2 second point coordinates
+ * @return {Number} distance
+ */
+
+function getDistance(point1, point2) {
+    return Math.sqrt(Math.pow(point1[0] - point2[0], 2) + Math.pow(point1[1] - point2[1], 2));
+}
+
+/**
+ * Returns coordinates of the curve point corresponding to the certain t
+ * a·(1 - t)³·p1 + b·(1 - t)²·t·p2 + c·(1 - t)·t²·p3 + d·t³·p4,
+ * where pN are control points and p1 is zero due to relative coordinates.
+ *
+ * @param {Array} curve array of curve points coordinates
+ * @param {Number} t parametric position from 0 to 1
+ * @return {Array} Point coordinates
+ */
+
+function getCubicBezierPoint(curve, t) {
+    var sqrT = t * t,
+        cubT = sqrT * t,
+        mt = 1 - t,
+        sqrMt = mt * mt;
+
+    return [
+        3 * sqrMt * t * curve[0] + 3 * mt * sqrT * curve[2] + cubT * curve[4],
+        3 * sqrMt * t * curve[1] + 3 * mt * sqrT * curve[3] + cubT * curve[5]
+    ];
+}
+
+/**
+ * Finds circle by 3 points of the curve and checks if the curve fits the found circle.
+ *
+ * @param {Array} curve
+ * @return {Object|undefined} circle
+ */
+
+function findCircle(curve) {
+    var midPoint = getCubicBezierPoint(curve, 1/2),
+        m1 = [midPoint[0] / 2, midPoint[1] / 2],
+        m2 = [(midPoint[0] + curve[4]) / 2, (midPoint[1] + curve[5]) / 2],
+        center = getIntersection([
+            m1[0], m1[1],
+            m1[0] + m1[1], m1[1] - m1[0],
+            m2[0], m2[1],
+            m2[0] + (m2[1] - midPoint[1]), m2[1] - (m2[0] - midPoint[0])
+        ]),
+        radius = center && getDistance([0, 0], center),
+        tolerance = Math.min(arcThreshold * error, arcTolerance * radius / 100);
+
+    if (center && [1/4, 3/4].every(function(point) {
+        return Math.abs(getDistance(getCubicBezierPoint(curve, point), center) - radius) <= tolerance;
+    }))
+        return { center: center, radius: radius};
+}
+
+/**
+ * Checks if a curve fits the given circe.
+ *
+ * @param {Object} circle
+ * @param {Array} curve
+ * @return {Boolean}
+ */
+
+function isArc(curve,  circle) {
+    var tolerance = Math.min(arcThreshold * error, arcTolerance * circle.radius / 100);
+
+    return [0, 1/4, 1/2, 3/4, 1].every(function(point) {
+        return Math.abs(getDistance(getCubicBezierPoint(curve, point), circle.center) - circle.radius) <= tolerance;
+    });
+}
+
+/**
+ * Checks if a previos curve fits the given circe.
+ *
+ * @param {Object} circle
+ * @param {Array} curve
+ * @return {Boolean}
+ */
+
+function isArcPrev(curve,  circle) {
+    return isArc(curve, {
+        center: [circle.center[0] + curve[4], circle.center[1] + curve[5]],
+        radius: circle.radius
+    });
+}
+
+/**
+ * Finds angle of a curve fitting the given arc.
+
+ * @param {Array} curve
+ * @param {Object} relCircle
+ * @return {Number} angle
+ */
+
+function findArcAngle(curve, relCircle) {
+    var x1 = -relCircle.center[0],
+        y1 = -relCircle.center[1],
+        x2 = curve[4] - relCircle.center[0],
+        y2 = curve[5] - relCircle.center[1];
+
+    return Math.acos(
+            (x1 * x2 + y1 * y2) /
+            Math.sqrt((x1 * x1 + y1 * y1) * (x2 * x2 + y2 * y2))
+        );
+}
+
+/**
+ * Converts given path data to string.
+ *
+ * @param {Object} params
+ * @param {Array} pathData
+ * @return {String}
+ */
+
+function data2Path(params, pathData) {
+    return pathData.reduce(function(pathString, item) {
+        return pathString += item.instruction + (item.data ? cleanupOutData(roundData(item.data.slice()), params) : '');
+    }, '');
+}
diff --git a/node_modules/svgo/plugins/convertShapeToPath.js b/node_modules/svgo/plugins/convertShapeToPath.js
new file mode 100644
index 00000000..6d328049
--- /dev/null
+++ b/node_modules/svgo/plugins/convertShapeToPath.js
@@ -0,0 +1,103 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'converts basic shapes to more compact path form';
+
+var none = { value: 0 },
+    regNumber = /[-+]?(?:\d*\.\d+|\d+\.?)(?:[eE][-+]?\d+)?/g;
+
+/**
+ * Converts basic shape to more compact path.
+ * It also allows further optimizations like
+ * combining paths with similar attributes.
+ *
+ * @see http://www.w3.org/TR/SVG/shapes.html
+ *
+ * @param {Object} item current iteration item
+ * @param {Object} params plugin params
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Lev Solntsev
+ */
+exports.fn = function(item) {
+
+    if (
+        item.isElem('rect') &&
+        item.hasAttr('width') &&
+        item.hasAttr('height') &&
+        !item.hasAttr('rx') &&
+        !item.hasAttr('ry')
+    ) {
+
+        var x = +(item.attr('x') || none).value,
+            y = +(item.attr('y') || none).value,
+            width  = +item.attr('width').value,
+            height = +item.attr('height').value;
+
+            // Values like '100%' compute to NaN, thus running after
+            // cleanupNumericValues when 'px' units has already been removed.
+            // TODO: Calculate sizes from % and non-px units if possible.
+        if (isNaN(x - y + width - height)) return;
+
+        var pathData =
+            'M' + x + ' ' + y +
+            'H' + (x + width) +
+            'V' + (y + height) +
+            'H' + x +
+            'z';
+
+        item.addAttr({
+                name: 'd',
+                value: pathData,
+                prefix: '',
+                local: 'd'
+            });
+
+        item.renameElem('path')
+            .removeAttr(['x', 'y', 'width', 'height']);
+
+    } else if (item.isElem('line')) {
+
+        var x1 = +(item.attr('x1') || none).value,
+            y1 = +(item.attr('y1') || none).value,
+            x2 = +(item.attr('x2') || none).value,
+            y2 = +(item.attr('y2') || none).value;
+        if (isNaN(x1 - y1 + x2 - y2)) return;
+
+        item.addAttr({
+                name: 'd',
+                value: 'M' + x1 + ' ' + y1 + 'L' + x2 + ' ' + y2,
+                prefix: '',
+                local: 'd'
+            });
+
+        item.renameElem('path')
+            .removeAttr(['x1', 'y1', 'x2', 'y2']);
+
+    } else if ((
+            item.isElem('polyline') ||
+            item.isElem('polygon')
+        ) &&
+        item.hasAttr('points')
+    ) {
+
+        var coords = (item.attr('points').value.match(regNumber) || []).map(Number);
+        if (coords.length < 4) return false;
+
+        item.addAttr({
+                name: 'd',
+                value: 'M' + coords.slice(0,2).join(' ') +
+                       'L' + coords.slice(2).join(' ') +
+                       (item.isElem('polygon') ? 'z' : ''),
+                prefix: '',
+                local: 'd'
+            });
+
+        item.renameElem('path')
+            .removeAttr('points');
+    }
+
+};
diff --git a/node_modules/svgo/plugins/convertStyleToAttrs.js b/node_modules/svgo/plugins/convertStyleToAttrs.js
new file mode 100644
index 00000000..02bbc550
--- /dev/null
+++ b/node_modules/svgo/plugins/convertStyleToAttrs.js
@@ -0,0 +1,117 @@
+/* jshint quotmark: false */
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'converts style to attributes';
+
+var EXTEND = require('whet.extend'),
+    stylingProps = require('./_collections').attrsGroups.presentation,
+    rEscape = '\\\\(?:[0-9a-f]{1,6}\\s?|\\r\\n|.)',                 // Like \" or \2051. Code points consume one space.
+    rAttr = '\\s*(' + g('[^:;\\\\]', rEscape) + '*?)\\s*',          // attribute name like ‘fill’
+    rSingleQuotes = "'(?:[^'\\n\\r\\\\]|" + rEscape + ")*?(?:'|$)", // string in single quotes: 'smth'
+    rQuotes = '"(?:[^"\\n\\r\\\\]|' + rEscape + ')*?(?:"|$)',       // string in double quotes: "smth"
+    rQuotedString = new RegExp('^' + g(rSingleQuotes, rQuotes) + '$'),
+
+    // Parentheses, E.g.: url(data:image/png;base64,iVBO...).
+    // ':' and ';' inside of it should be threated as is. (Just like in strings.)
+    rParenthesis = '\\(' + g('[^\'"()\\\\]+', rEscape, rSingleQuotes, rQuotes) + '*?' + '\\)',
+
+    // The value. It can have strings and parentheses (see above). Fallbacks to anything in case of unexpected input.
+    rValue = '\\s*(' + g('[^\'"();\\\\]+?', rEscape, rSingleQuotes, rQuotes, rParenthesis, '[^;]*?') + '*?' + ')',
+
+    // End of declaration. Spaces outside of capturing groups help to do natural trimming.
+    rDeclEnd = '\\s*(?:;\\s*|$)',
+
+    // Final RegExp to parse CSS declarations.
+    regDeclarationBlock = new RegExp(rAttr + ':' + rValue + rDeclEnd, 'ig'),
+
+    // Comments expression. Honors escape sequences and strings.
+    regStripComments = new RegExp(g(rEscape, rSingleQuotes, rQuotes, '/\\*[^]*?\\*/'), 'ig');
+
+/**
+ * Convert style in attributes. Cleanups comments and illegal declarations (without colon) as a side effect.
+ *
+ * @example
+ * <g style="fill:#000; color: #fff;">
+ *             ⬇
+ * <g fill="#000" color="#fff">
+ *
+ * @example
+ * <g style="fill:#000; color: #fff; -webkit-blah: blah">
+ *             ⬇
+ * <g fill="#000" color="#fff" style="-webkit-blah: blah">
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item) {
+    /* jshint boss: true */
+
+    if (item.elem && item.hasAttr('style')) {
+            // ['opacity: 1', 'color: #000']
+        var styleValue = item.attr('style').value,
+            styles = [],
+            attrs = {};
+
+        // Strip CSS comments preserving escape sequences and strings.
+        styleValue = styleValue.replace(regStripComments, function(match) {
+            return match[0] == '/' ? '' :
+                match[0] == '\\' && /[-g-z]/i.test(match[1]) ? match[1] : match;
+        });
+
+        regDeclarationBlock.lastIndex = 0;
+        for (var rule; rule = regDeclarationBlock.exec(styleValue);) {
+            styles.push([rule[1], rule[2]]);
+        }
+
+        if (styles.length) {
+
+            styles = styles.filter(function(style) {
+                if (style[0]) {
+                    var prop = style[0].toLowerCase(),
+                        val = style[1];
+
+                    if (rQuotedString.test(val)) {
+                        val = val.slice(1, -1);
+                    }
+
+                    if (stylingProps.indexOf(prop) > -1) {
+
+                        attrs[prop] = {
+                            name: prop,
+                            value: val,
+                            local: prop,
+                            prefix: ''
+                        };
+
+                        return false;
+                    }
+                }
+
+                return true;
+            });
+
+            EXTEND(item.attrs, attrs);
+
+            if (styles.length) {
+                item.attr('style').value = styles
+                    .map(function(declaration) { return declaration.join(':') })
+                    .join(';');
+            } else {
+                item.removeAttr('style');
+            }
+
+        }
+
+    }
+
+};
+
+function g() {
+    return '(?:' + Array.prototype.join.call(arguments, '|') + ')';
+}
diff --git a/node_modules/svgo/plugins/convertTransform.js b/node_modules/svgo/plugins/convertTransform.js
new file mode 100644
index 00000000..c2085892
--- /dev/null
+++ b/node_modules/svgo/plugins/convertTransform.js
@@ -0,0 +1,364 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'collapses multiple transformations and optimizes it';
+
+exports.params = {
+    convertToShorts: true,
+    // degPrecision: 3, // transformPrecision (or matrix precision) - 2 by default
+    floatPrecision: 3,
+    transformPrecision: 5,
+    matrixToTransform: true,
+    shortTranslate: true,
+    shortScale: true,
+    shortRotate: true,
+    removeUseless: true,
+    collapseIntoOne: true,
+    leadingZero: true,
+    negativeExtraSpace: false
+};
+
+var cleanupOutData = require('../lib/svgo/tools').cleanupOutData,
+    EXTEND = require('whet.extend'),
+    transform2js = require('./_transforms.js').transform2js,
+    transformsMultiply = require('./_transforms.js').transformsMultiply,
+    matrixToTransform = require('./_transforms.js').matrixToTransform,
+    degRound,
+    floatRound,
+    transformRound;
+
+/**
+ * Convert matrices to the short aliases,
+ * convert long translate, scale or rotate transform notations to the shorts ones,
+ * convert transforms to the matrices and multiply them all into one,
+ * remove useless transforms.
+ *
+ * @see http://www.w3.org/TR/SVG/coords.html#TransformMatrixDefined
+ *
+ * @param {Object} item current iteration item
+ * @param {Object} params plugin params
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item, params) {
+
+    if (item.elem) {
+
+        // transform
+        if (item.hasAttr('transform')) {
+            convertTransform(item, 'transform', params);
+        }
+
+        // gradientTransform
+        if (item.hasAttr('gradientTransform')) {
+            convertTransform(item, 'gradientTransform', params);
+        }
+
+        // patternTransform
+        if (item.hasAttr('patternTransform')) {
+            convertTransform(item, 'patternTransform', params);
+        }
+
+    }
+
+};
+
+/**
+ * Main function.
+ *
+ * @param {Object} item input item
+ * @param {String} attrName attribute name
+ * @param {Object} params plugin params
+ */
+function convertTransform(item, attrName, params) {
+    var data = transform2js(item.attr(attrName).value);
+    params = definePrecision(data, params);
+
+    if (params.collapseIntoOne && data.length > 1) {
+        data = [transformsMultiply(data)];
+    }
+
+    if (params.convertToShorts) {
+        data = convertToShorts(data, params);
+    } else {
+        data.forEach(roundTransform);
+    }
+
+    if (params.removeUseless) {
+        data = removeUseless(data);
+    }
+
+    if (data.length) {
+        item.attr(attrName).value = js2transform(data, params);
+    } else {
+        item.removeAttr(attrName);
+    }
+}
+
+/**
+ * Defines precision to work with certain parts.
+ * transformPrecision - for scale and four first matrix parameters (needs a better precision due to multiplying),
+ * floatPrecision - for translate including two last matrix and rotate parameters,
+ * degPrecision - for rotate and skew. By default it's equal to (rougly)
+ * transformPrecision - 2 or floatPrecision whichever is lower. Can be set in params.
+ *
+ * @param {Array} transforms input array
+ * @param {Object} params plugin params
+ * @return {Array} output array
+ */
+function definePrecision(data, params) {
+    /* jshint validthis: true */
+    var matrixData = data.reduce(getMatrixData, []),
+        significantDigits = params.transformPrecision;
+
+    // Clone params so it don't affect other elements transformations.
+    params = EXTEND({}, params);
+
+    // Limit transform precision with matrix one. Calculating with larger precision doesn't add any value.
+    if (matrixData.length) {
+        params.transformPrecision = Math.min(params.transformPrecision,
+            Math.max.apply(Math, matrixData.map(floatDigits)) || params.transformPrecision);
+
+        significantDigits = Math.max.apply(Math, matrixData.map(function(n) {
+            return String(n).replace(/\D+/g, '').length; // Number of digits in a number. 123.45 → 5
+        }));
+    }
+    // No sense in angle precision more then number of significant digits in matrix.
+    if (!('degPrecision' in params)) {
+        params.degPrecision = Math.max(0, Math.min(params.floatPrecision, significantDigits - 2));
+    }
+
+    floatRound = params.floatPrecision >= 1 && params.floatPrecision < 20 ?
+        smartRound.bind(this, params.floatPrecision) :
+        round;
+    degRound = params.degPrecision >= 1 && params.floatPrecision < 20 ?
+        smartRound.bind(this, params.degPrecision) :
+        round;
+    transformRound = params.transformPrecision >= 1 && params.floatPrecision < 20 ?
+        smartRound.bind(this, params.transformPrecision) :
+        round;
+
+    return params;
+}
+
+/**
+ * Gathers four first matrix parameters.
+ *
+ * @param {Array} a array of data
+ * @param {Object} transform
+ * @return {Array} output array
+ */
+function getMatrixData(a, b) {
+    return b.name == 'matrix' ? a.concat(b.data.slice(0, 4)) : a;
+}
+
+/**
+ * Returns number of digits after the point. 0.125 → 3
+ */
+function floatDigits(n) {
+    return (n = String(n)).slice(n.indexOf('.')).length - 1;
+}
+
+/**
+ * Convert transforms to the shorthand alternatives.
+ *
+ * @param {Array} transforms input array
+ * @param {Object} params plugin params
+ * @return {Array} output array
+ */
+function convertToShorts(transforms, params) {
+
+    for(var i = 0; i < transforms.length; i++) {
+
+        var transform = transforms[i];
+
+        // convert matrix to the short aliases
+        if (
+            params.matrixToTransform &&
+            transform.name === 'matrix'
+        ) {
+            var decomposed = matrixToTransform(transform, params);
+            if (decomposed != transform &&
+                js2transform(decomposed, params).length <= js2transform([transform], params).length) {
+
+                transforms.splice.apply(transforms, [i, 1].concat(decomposed));
+            }
+            transform = transforms[i];
+        }
+
+        // fixed-point numbers
+        // 12.754997 → 12.755
+        roundTransform(transform);
+
+        // convert long translate transform notation to the shorts one
+        // translate(10 0) → translate(10)
+        if (
+            params.shortTranslate &&
+            transform.name === 'translate' &&
+            transform.data.length === 2 &&
+            !transform.data[1]
+        ) {
+            transform.data.pop();
+        }
+
+        // convert long scale transform notation to the shorts one
+        // scale(2 2) → scale(2)
+        if (
+            params.shortScale &&
+            transform.name === 'scale' &&
+            transform.data.length === 2 &&
+            transform.data[0] === transform.data[1]
+        ) {
+            transform.data.pop();
+        }
+
+        // convert long rotate transform notation to the short one
+        // translate(cx cy) rotate(a) translate(-cx -cy) → rotate(a cx cy)
+        if (
+            params.shortRotate &&
+            transforms[i - 2] &&
+            transforms[i - 2].name === 'translate' &&
+            transforms[i - 1].name === 'rotate' &&
+            transforms[i].name === 'translate' &&
+            transforms[i - 2].data[0] === -transforms[i].data[0] &&
+            transforms[i - 2].data[1] === -transforms[i].data[1]
+        ) {
+            transforms.splice(i - 2, 3, {
+                name: 'rotate',
+                data: [
+                    transforms[i - 1].data[0],
+                    transforms[i - 2].data[0],
+                    transforms[i - 2].data[1]
+                ]
+            });
+
+            // splice compensation
+            i -= 2;
+
+            transform = transforms[i];
+        }
+
+    }
+
+    return transforms;
+
+}
+
+/**
+ * Remove useless transforms.
+ *
+ * @param {Array} transforms input array
+ * @return {Array} output array
+ */
+function removeUseless(transforms) {
+
+    return transforms.filter(function(transform) {
+
+        // translate(0), rotate(0[, cx, cy]), skewX(0), skewY(0)
+        if (
+            ['translate', 'rotate', 'skewX', 'skewY'].indexOf(transform.name) > -1 &&
+            (transform.data.length == 1 || transform.name == 'rotate') &&
+            !transform.data[0] ||
+
+            // translate(0, 0)
+            transform.name == 'translate' &&
+            !transform.data[0] &&
+            !transform.data[1] ||
+
+            // scale(1)
+            transform.name == 'scale' &&
+            transform.data[0] == 1 &&
+            (transform.data.length < 2 || transform.data[1] == 1) ||
+
+            // matrix(1 0 0 1 0 0)
+            transform.name == 'matrix' &&
+            transform.data[0] == 1 &&
+            transform.data[3] == 1 &&
+            !(transform.data[1] || transform.data[2] || transform.data[4] || transform.data[5])
+        ) {
+            return false;
+        }
+
+        return true;
+
+    });
+
+}
+
+/**
+ * Convert transforms JS representation to string.
+ *
+ * @param {Array} transformJS JS representation array
+ * @param {Object} params plugin params
+ * @return {String} output string
+ */
+function js2transform(transformJS, params) {
+
+    var transformString = '';
+
+    // collect output value string
+    transformJS.forEach(function(transform) {
+        roundTransform(transform);
+        transformString += (transformString && ' ') + transform.name + '(' + cleanupOutData(transform.data, params) + ')';
+    });
+
+    return transformString;
+
+}
+
+function roundTransform(transform) {
+    switch (transform.name) {
+        case 'translate':
+            transform.data = floatRound(transform.data);
+            break;
+        case 'rotate':
+            transform.data = degRound(transform.data.slice(0, 1)).concat(floatRound(transform.data.slice(1)));
+            break;
+        case 'skewX':
+        case 'skewY':
+            transform.data = degRound(transform.data);
+            break;
+        case 'scale':
+            transform.data = transformRound(transform.data);
+            break;
+        case 'matrix':
+            transform.data = transformRound(transform.data.slice(0, 4)).concat(floatRound(transform.data.slice(4)));
+            break;
+    }
+    return transform;
+}
+
+/**
+ * Rounds numbers in array.
+ *
+ * @param {Array} data input data array
+ * @return {Array} output data array
+ */
+function round(data) {
+    return data.map(Math.round);
+}
+
+/**
+ * Decrease accuracy of floating-point numbers
+ * in transforms keeping a specified number of decimals.
+ * Smart rounds values like 2.349 to 2.35.
+ *
+ * @param {Number} fixed number of decimals
+ * @param {Array} data input data array
+ * @return {Array} output data array
+ */
+function smartRound(precision, data) {
+    for (var i = data.length, tolerance = +Math.pow(.1, precision).toFixed(precision); i--;) {
+        if (data[i].toFixed(precision) != data[i]) {
+            var rounded = +data[i].toFixed(precision - 1);
+            data[i] = +Math.abs(rounded - data[i]).toFixed(precision + 1) >= tolerance ?
+                +data[i].toFixed(precision) :
+                rounded;
+        }
+    }
+    return data;
+}
diff --git a/node_modules/svgo/plugins/mergePaths.js b/node_modules/svgo/plugins/mergePaths.js
new file mode 100644
index 00000000..63cf56e8
--- /dev/null
+++ b/node_modules/svgo/plugins/mergePaths.js
@@ -0,0 +1,71 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'merges multiple paths in one if possible';
+
+exports.params = {
+    collapseRepeated: true,
+    leadingZero: true,
+    negativeExtraSpace: true
+};
+
+var path2js = require('./_path.js').path2js,
+    js2path = require('./_path.js').js2path,
+    intersects = require('./_path.js').intersects;
+
+/**
+ * Merge multiple Paths into one.
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich, Lev Solntsev
+ */
+exports.fn = function(item, params) {
+
+    if (!item.isElem() || item.isEmpty()) return;
+
+    var prevContentItem = null,
+        prevContentItemKeys = null;
+
+    item.content = item.content.filter(function(contentItem) {
+
+        if (prevContentItem &&
+            prevContentItem.isElem('path') &&
+            prevContentItem.isEmpty() &&
+            prevContentItem.hasAttr('d') &&
+            contentItem.isElem('path') &&
+            contentItem.isEmpty() &&
+            contentItem.hasAttr('d')
+        ) {
+
+            if (!prevContentItemKeys) {
+                prevContentItemKeys = Object.keys(prevContentItem.attrs);
+            }
+
+            var contentItemAttrs = Object.keys(contentItem.attrs),
+                equalData = prevContentItemKeys.length == contentItemAttrs.length &&
+                    contentItemAttrs.every(function(key) {
+                        return key == 'd' ||
+                            prevContentItem.hasAttr(key) &&
+                            prevContentItem.attr(key).value == contentItem.attr(key).value;
+                    }),
+                prevPathJS = path2js(prevContentItem),
+                curPathJS = path2js(contentItem);
+
+            if (equalData && !intersects(prevPathJS, curPathJS)) {
+                js2path(prevContentItem, prevPathJS.concat(curPathJS), params);
+                return false;
+            }
+        }
+
+        prevContentItem = contentItem;
+        prevContentItemKeys = null;
+        return true;
+
+    });
+
+};
diff --git a/node_modules/svgo/plugins/minifyStyles.js b/node_modules/svgo/plugins/minifyStyles.js
new file mode 100644
index 00000000..3977b367
--- /dev/null
+++ b/node_modules/svgo/plugins/minifyStyles.js
@@ -0,0 +1,45 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.params = {
+    svgo: {}
+};
+
+exports.description = 'minifies existing styles in svg';
+
+var csso = require('csso');
+
+/**
+ * Minifies styles (<style> element + style attribute) using svgo
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author strarsis <strarsis@gmail.com>
+ */
+exports.fn = function(item, svgoOptions) {
+
+    if(item.elem) {
+        if(item.isElem('style') && !item.isEmpty()) {
+            var styleCss = item.content[0].text || item.content[0].cdata || [],
+                DATA = styleCss.indexOf('>') >= 0 || styleCss.indexOf('<') >= 0 ? 'cdata' : 'text';
+            if(styleCss.length > 0) {
+                var styleCssMinified = csso.minify(styleCss, svgoOptions);
+                item.content[0][DATA] = styleCssMinified.css;
+            }
+      }
+
+      if(item.hasAttr('style')) {
+          var itemCss = item.attr('style').value;
+          if(itemCss.length > 0) {
+              var itemCssMinified = csso.minifyBlock(itemCss, svgoOptions);
+              item.attr('style').value = itemCssMinified.css;
+          }
+      }
+    }
+
+    return item;
+};
diff --git a/node_modules/svgo/plugins/moveElemsAttrsToGroup.js b/node_modules/svgo/plugins/moveElemsAttrsToGroup.js
new file mode 100644
index 00000000..0f3b65c7
--- /dev/null
+++ b/node_modules/svgo/plugins/moveElemsAttrsToGroup.js
@@ -0,0 +1,126 @@
+'use strict';
+
+exports.type = 'perItemReverse';
+
+exports.active = true;
+
+exports.description = 'moves elements attributes to the existing group wrapper';
+
+var inheritableAttrs = require('./_collections').inheritableAttrs,
+    pathElems = require('./_collections.js').pathElems;
+
+/**
+ * Collapse content's intersected and inheritable
+ * attributes to the existing group wrapper.
+ *
+ * @example
+ * <g attr1="val1">
+ *     <g attr2="val2">
+ *         text
+ *     </g>
+ *     <circle attr2="val2" attr3="val3"/>
+ * </g>
+ *              ⬇
+ * <g attr1="val1" attr2="val2">
+ *     <g>
+ *         text
+ *     </g>
+ *    <circle attr3="val3"/>
+ * </g>
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item) {
+
+    if (item.isElem('g') && !item.isEmpty() && item.content.length > 1) {
+
+        var intersection = {},
+            hasTransform = false,
+            hasClip = item.hasAttr('clip-path') || item.hasAttr('mask'),
+            intersected = item.content.every(function(inner) {
+                if (inner.isElem() && inner.hasAttr()) {
+                    // don't mess with possible styles (hack until CSS parsing is implemented)
+                    if (inner.hasAttr('class')) return false;
+                    if (!Object.keys(intersection).length) {
+                        intersection = inner.attrs;
+                    } else {
+                        intersection = intersectInheritableAttrs(intersection, inner.attrs);
+
+                        if (!intersection) return false;
+                    }
+
+                    return true;
+                }
+            }),
+            allPath = item.content.every(function(inner) {
+                return inner.isElem(pathElems);
+            });
+
+        if (intersected) {
+
+            item.content.forEach(function(g) {
+
+                for (var name in intersection) {
+
+                    if (!allPath && !hasClip || name !== 'transform') {
+
+                        g.removeAttr(name);
+
+                        if (name === 'transform') {
+                            if (!hasTransform) {
+                                if (item.hasAttr('transform')) {
+                                    item.attr('transform').value += ' ' + intersection[name].value;
+                                } else {
+                                    item.addAttr(intersection[name]);
+                                }
+
+                                hasTransform = true;
+                            }
+                        } else {
+                            item.addAttr(intersection[name]);
+                        }
+
+                    }
+                }
+
+            });
+
+        }
+
+    }
+
+};
+
+/**
+ * Intersect inheritable attributes.
+ *
+ * @param {Object} a first attrs object
+ * @param {Object} b second attrs object
+ *
+ * @return {Object} intersected attrs object
+ */
+function intersectInheritableAttrs(a, b) {
+
+    var c = {};
+
+    for (var n in a) {
+        if (
+            b.hasOwnProperty(n) &&
+            inheritableAttrs.indexOf(n) > -1 &&
+            a[n].name === b[n].name &&
+            a[n].value === b[n].value &&
+            a[n].prefix === b[n].prefix &&
+            a[n].local === b[n].local
+        ) {
+            c[n] = a[n];
+        }
+    }
+
+    if (!Object.keys(c).length) return false;
+
+    return c;
+
+}
diff --git a/node_modules/svgo/plugins/moveGroupAttrsToElems.js b/node_modules/svgo/plugins/moveGroupAttrsToElems.js
new file mode 100644
index 00000000..a966f882
--- /dev/null
+++ b/node_modules/svgo/plugins/moveGroupAttrsToElems.js
@@ -0,0 +1,63 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'moves some group attributes to the content elements';
+
+var collections = require('./_collections.js'),
+    pathElems = collections.pathElems.concat(['g', 'text']),
+    referencesProps = collections.referencesProps;
+
+/**
+ * Move group attrs to the content elements.
+ *
+ * @example
+ * <g transform="scale(2)">
+ *     <path transform="rotate(45)" d="M0,0 L10,20"/>
+ *     <path transform="translate(10, 20)" d="M0,10 L20,30"/>
+ * </g>
+ *                          ⬇
+ * <g>
+ *     <path transform="scale(2) rotate(45)" d="M0,0 L10,20"/>
+ *     <path transform="scale(2) translate(10, 20)" d="M0,10 L20,30"/>
+ * </g>
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item) {
+
+    // move group transform attr to content's pathElems
+    if (
+        item.isElem('g') &&
+        item.hasAttr('transform') &&
+        !item.isEmpty() &&
+        !item.someAttr(function(attr) {
+            return ~referencesProps.indexOf(attr.name) && ~attr.value.indexOf('url(');
+        }) &&
+        item.content.every(function(inner) {
+            return inner.isElem(pathElems) && !inner.hasAttr('id');
+        })
+    ) {
+        item.content.forEach(function(inner) {
+            var attr = item.attr('transform');
+            if (inner.hasAttr('transform')) {
+                inner.attr('transform').value = attr.value + ' ' + inner.attr('transform').value;
+            } else {
+                inner.addAttr({
+                    'name': attr.name,
+                    'local': attr.local,
+                    'prefix': attr.prefix,
+                    'value': attr.value
+                });
+            }
+        });
+
+        item.removeAttr('transform');
+    }
+
+};
diff --git a/node_modules/svgo/plugins/removeAttrs.js b/node_modules/svgo/plugins/removeAttrs.js
new file mode 100644
index 00000000..bd2fca62
--- /dev/null
+++ b/node_modules/svgo/plugins/removeAttrs.js
@@ -0,0 +1,119 @@
+'use strict';
+
+var ELEM_SEP = ':';
+
+exports.type = 'perItem';
+
+exports.active = false;
+
+exports.description = 'removes specified attributes';
+
+exports.params = {
+    attrs: []
+};
+
+/**
+ * Remove attributes
+ *
+ * @param attrs:
+ *
+ *   format: [ element* : attribute* ]
+ *
+ *   element   : regexp (wrapped into ^...$), single * or omitted > all elements
+ *   attribute : regexp (wrapped into ^...$)
+ *
+ *   examples:
+ *
+ *     > basic: remove fill attribute
+ *     ---
+ *     removeAttrs:
+ *       attrs: 'fill'
+ *
+ *     > remove fill attribute on path element
+ *     ---
+ *       attrs: 'path:fill'
+ *
+ *
+ *     > remove all fill and stroke attribute
+ *     ---
+ *       attrs:
+ *         - 'fill'
+ *         - 'stroke'
+ *
+ *     [is same as]
+ *
+ *       attrs: '(fill|stroke)'
+ *
+ *     [is same as]
+ *
+ *       attrs: '*:(fill|stroke)'
+ *
+ *     [is same as]
+ *
+ *       attrs: '.*:(fill|stroke)'
+ *
+ *
+ *     > remove all stroke related attributes
+ *     ----
+ *     attrs: 'stroke.*'
+ *
+ *
+ * @param {Object} item current iteration item
+ * @param {Object} params plugin params
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Benny Schudel
+ */
+exports.fn = function(item, params) {
+
+        // wrap into an array if params is not
+    if (!Array.isArray(params.attrs)) {
+        params.attrs = [params.attrs];
+    }
+
+    if (item.isElem()) {
+
+            // prepare patterns
+        var patterns = params.attrs.map(function(pattern) {
+
+                // apply to all elements if specifc element is omitted
+            if (pattern.indexOf(ELEM_SEP) === -1) {
+                pattern = ['.*', ELEM_SEP, pattern].join('');
+            }
+
+                // create regexps for element and attribute name
+            return pattern.split(ELEM_SEP)
+                .map(function(value) {
+
+                        // adjust single * to match anything
+                    if (value === '*') { value = '.*'; }
+
+                    return new RegExp(['^', value, '$'].join(''), 'i');
+                });
+
+        });
+
+            // loop patterns
+        patterns.forEach(function(pattern) {
+
+                // matches element
+            if (pattern[0].test(item.elem)) {
+
+                    // loop attributes
+                item.eachAttr(function(attr) {
+                    var name = attr.name;
+
+                        // matches attribute name
+                    if (pattern[1].test(name)) {
+                        item.removeAttr(name);
+                    }
+
+                });
+
+            }
+
+        });
+
+    }
+
+};
diff --git a/node_modules/svgo/plugins/removeComments.js b/node_modules/svgo/plugins/removeComments.js
new file mode 100644
index 00000000..8bfd21b0
--- /dev/null
+++ b/node_modules/svgo/plugins/removeComments.js
@@ -0,0 +1,27 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'removes comments';
+
+/**
+ * Remove comments.
+ *
+ * @example
+ * <!-- Generator: Adobe Illustrator 15.0.0, SVG Export
+ * Plug-In . SVG Version: 6.00 Build 0)  -->
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item) {
+
+    if (item.comment && item.comment.charAt(0) !== '!') {
+        return false;
+    }
+
+};
diff --git a/node_modules/svgo/plugins/removeDesc.js b/node_modules/svgo/plugins/removeDesc.js
new file mode 100644
index 00000000..e2848c6c
--- /dev/null
+++ b/node_modules/svgo/plugins/removeDesc.js
@@ -0,0 +1,32 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.params = {
+    removeAny: false
+};
+
+exports.description = 'removes <desc> (only non-meaningful by default)';
+
+var standardDescs = /^Created with/;
+
+/**
+ * Removes <desc>.
+ * Removes only standard editors content or empty elements 'cause it can be used for accessibility.
+ * Enable parameter 'removeAny' to remove any description.
+ *
+ * https://developer.mozilla.org/en-US/docs/Web/SVG/Element/desc
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Daniel Wabyick
+ */
+exports.fn = function(item, params) {
+
+    return !item.isElem('desc') || !(params.removeAny || item.isEmpty() ||
+            standardDescs.test(item.content[0].text));
+
+};
diff --git a/node_modules/svgo/plugins/removeDimensions.js b/node_modules/svgo/plugins/removeDimensions.js
new file mode 100644
index 00000000..b25ff8f7
--- /dev/null
+++ b/node_modules/svgo/plugins/removeDimensions.js
@@ -0,0 +1,32 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = false;
+
+exports.description = 'removes width and height in presence of viewBox';
+
+/**
+ * Remove width/height attributes when a viewBox attribute is present.
+ *
+ * @example
+ * <svg width="100" height="50" viewBox="0 0 100 50">
+ *   ↓
+ * <svg viewBox="0 0 100 50">
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if true, with and height will be filtered out
+ *
+ * @author Benny Schudel
+ */
+exports.fn = function(item) {
+
+    if (
+        item.isElem('svg') &&
+        item.hasAttr('viewBox')
+    ) {
+        item.removeAttr('width');
+        item.removeAttr('height');
+    }
+
+};
diff --git a/node_modules/svgo/plugins/removeDoctype.js b/node_modules/svgo/plugins/removeDoctype.js
new file mode 100644
index 00000000..32ee4f46
--- /dev/null
+++ b/node_modules/svgo/plugins/removeDoctype.js
@@ -0,0 +1,40 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'removes doctype declaration';
+
+/**
+ * Remove DOCTYPE declaration.
+ *
+ * "Unfortunately the SVG DTDs are a source of so many
+ * issues that the SVG WG has decided not to write one
+ * for the upcoming SVG 1.2 standard. In fact SVG WG
+ * members are even telling people not to use a DOCTYPE
+ * declaration in SVG 1.0 and 1.1 documents"
+ * https://jwatt.org/svg/authoring/#doctype-declaration
+ *
+ * @example
+ * <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
+ * q"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+ *
+ * @example
+ * <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+ * "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" [
+ *     <!-- an internal subset can be embedded here -->
+ * ]>
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item) {
+
+    if (item.doctype) {
+        return false;
+    }
+
+};
diff --git a/node_modules/svgo/plugins/removeEditorsNSData.js b/node_modules/svgo/plugins/removeEditorsNSData.js
new file mode 100644
index 00000000..9e5c8cd8
--- /dev/null
+++ b/node_modules/svgo/plugins/removeEditorsNSData.js
@@ -0,0 +1,65 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'removes editors namespaces, elements and attributes';
+
+var editorNamespaces = require('./_collections').editorNamespaces,
+    prefixes = [];
+
+exports.params = {
+    additionalNamespaces: []
+};
+
+/**
+ * Remove editors namespaces, elements and attributes.
+ *
+ * @example
+ * <svg xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd">
+ * <sodipodi:namedview/>
+ * <path sodipodi:nodetypes="cccc"/>
+ *
+ * @param {Object} item current iteration item
+ * @param {Object} params plugin params
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item, params) {
+
+    if (Array.isArray(params.additionalNamespaces)) {
+        editorNamespaces = editorNamespaces.concat(params.additionalNamespaces);
+    }
+
+    if (item.elem) {
+
+        if (item.isElem('svg')) {
+
+            item.eachAttr(function(attr) {
+                if (attr.prefix === 'xmlns' && editorNamespaces.indexOf(attr.value) > -1) {
+                    prefixes.push(attr.local);
+
+                    // <svg xmlns:sodipodi="">
+                    item.removeAttr(attr.name);
+                }
+            });
+
+        }
+
+        // <* sodipodi:*="">
+        item.eachAttr(function(attr) {
+            if (prefixes.indexOf(attr.prefix) > -1) {
+                item.removeAttr(attr.name);
+            }
+        });
+
+        // <sodipodi:*>
+        if (prefixes.indexOf(item.prefix) > -1) {
+            return false;
+        }
+
+    }
+
+};
diff --git a/node_modules/svgo/plugins/removeElementsByAttr.js b/node_modules/svgo/plugins/removeElementsByAttr.js
new file mode 100644
index 00000000..c726f708
--- /dev/null
+++ b/node_modules/svgo/plugins/removeElementsByAttr.js
@@ -0,0 +1,80 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = false;
+
+exports.description = 'removes arbitrary elements by ID or className (disabled by default)';
+
+exports.params = {
+    id: [],
+    class: []
+};
+
+/**
+ * Remove arbitrary SVG elements by ID or className.
+ *
+ * @param id
+ *   examples:
+ *
+ *     > single: remove element with ID of `elementID`
+ *     ---
+ *     removeElementsByAttr:
+ *       id: 'elementID'
+ *
+ *     > list: remove multiple elements by ID
+ *     ---
+ *     removeElementsByAttr:
+ *       id:
+ *         - 'elementID'
+ *         - 'anotherID'
+ *
+ * @param class
+ *   examples:
+ *
+ *     > single: remove all elements with class of `elementClass`
+ *     ---
+ *     removeElementsByAttr:
+ *       class: 'elementClass'
+ *
+ *     > list: remove all elements with class of `elementClass` or `anotherClass`
+ *     ---
+ *     removeElementsByAttr:
+ *       class:
+ *         - 'elementClass'
+ *         - 'anotherClass'
+ *
+ * @param {Object} item current iteration item
+ * @param {Object} params plugin params
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Eli Dupuis (@elidupuis)
+ */
+exports.fn = function(item, params) {
+    var elemId, elemClass;
+
+    // wrap params in an array if not already
+    ['id', 'class'].forEach(function(key) {
+        if (!Array.isArray(params[key])) {
+            params[key] = [ params[key] ];
+        }
+    });
+
+    // abort if current item is no an element
+    if (!item.isElem()) {
+        return;
+    }
+
+    // remove element if it's `id` matches configured `id` params
+    elemId = item.attr('id');
+    if (elemId) {
+        return params.id.indexOf(elemId.value) === -1;
+    }
+
+    // remove element if it's `class` contains any of the configured `class` params
+    elemClass = item.attr('class');
+    if (elemClass) {
+        var hasClassRegex = new RegExp(params.class.join('|'));
+        return !hasClassRegex.test(elemClass.value);
+    }
+};
diff --git a/node_modules/svgo/plugins/removeEmptyAttrs.js b/node_modules/svgo/plugins/removeEmptyAttrs.js
new file mode 100644
index 00000000..ae73e6c9
--- /dev/null
+++ b/node_modules/svgo/plugins/removeEmptyAttrs.js
@@ -0,0 +1,29 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'removes empty attributes';
+
+/**
+ * Remove attributes with empty values.
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item) {
+
+    if (item.elem) {
+
+        item.eachAttr(function(attr) {
+            if (attr.value === '') {
+                item.removeAttr(attr.name);
+            }
+        });
+
+    }
+
+};
diff --git a/node_modules/svgo/plugins/removeEmptyContainers.js b/node_modules/svgo/plugins/removeEmptyContainers.js
new file mode 100644
index 00000000..356a5835
--- /dev/null
+++ b/node_modules/svgo/plugins/removeEmptyContainers.js
@@ -0,0 +1,32 @@
+'use strict';
+
+exports.type = 'perItemReverse';
+
+exports.active = true;
+
+exports.description = 'removes empty container elements';
+
+var container = require('./_collections').elemsGroups.container;
+
+/**
+ * Remove empty containers.
+ *
+ * @see http://www.w3.org/TR/SVG/intro.html#TermContainerElement
+ *
+ * @example
+ * <defs/>
+ *
+ * @example
+ * <g><marker><a/></marker></g>
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item) {
+
+    return !(item.isElem(container) && !item.isElem('svg') && item.isEmpty() &&
+        (!item.isElem('pattern') || !item.hasAttrLocal('href')));
+
+};
diff --git a/node_modules/svgo/plugins/removeEmptyText.js b/node_modules/svgo/plugins/removeEmptyText.js
new file mode 100644
index 00000000..049b1819
--- /dev/null
+++ b/node_modules/svgo/plugins/removeEmptyText.js
@@ -0,0 +1,59 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'removes empty <text> elements';
+
+exports.params = {
+    text: true,
+    tspan: true,
+    tref: true
+};
+
+/**
+ * Remove empty Text elements.
+ *
+ * @see http://www.w3.org/TR/SVG/text.html
+ *
+ * @example
+ * Remove empty text element:
+ * <text/>
+ *
+ * Remove empty tspan element:
+ * <tspan/>
+ *
+ * Remove tref with empty xlink:href attribute:
+ * <tref xlink:href=""/>
+ *
+ * @param {Object} item current iteration item
+ * @param {Object} params plugin params
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item, params) {
+
+    // Remove empty text element
+    if (
+        params.text &&
+        item.isElem('text') &&
+        item.isEmpty()
+    ) return false;
+
+    // Remove empty tspan element
+    if (
+        params.tspan &&
+        item.isElem('tspan') &&
+        item.isEmpty()
+    ) return false;
+
+    // Remove tref with empty xlink:href attribute
+    if (
+        params.tref &&
+        item.isElem('tref') &&
+        !item.hasAttrLocal('href')
+    ) return false;
+
+};
diff --git a/node_modules/svgo/plugins/removeHiddenElems.js b/node_modules/svgo/plugins/removeHiddenElems.js
new file mode 100644
index 00000000..231a2bdf
--- /dev/null
+++ b/node_modules/svgo/plugins/removeHiddenElems.js
@@ -0,0 +1,218 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'removes hidden elements (zero sized, with absent attributes)';
+
+exports.params = {
+    displayNone: true,
+    opacity0: true,
+    circleR0: true,
+    ellipseRX0: true,
+    ellipseRY0: true,
+    rectWidth0: true,
+    rectHeight0: true,
+    patternWidth0: true,
+    patternHeight0: true,
+    imageWidth0: true,
+    imageHeight0: true,
+    pathEmptyD: true,
+    polylineEmptyPoints: true,
+    polygonEmptyPoints: true
+};
+
+var regValidPath = /M\s*(?:[-+]?(?:\d*\.\d+|\d+(?:\.|(?!\.)))([eE][-+]?\d+)?(?!\d)\s*,?\s*){2}\D*\d/i;
+
+/**
+ * Remove hidden elements with disabled rendering:
+ * - display="none"
+ * - opacity="0"
+ * - circle with zero radius
+ * - ellipse with zero x-axis or y-axis radius
+ * - rectangle with zero width or height
+ * - pattern with zero width or height
+ * - image with zero width or height
+ * - path with empty data
+ * - polyline with empty points
+ * - polygon with empty points
+ *
+ * @param {Object} item current iteration item
+ * @param {Object} params plugin params
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item, params) {
+
+    if (item.elem) {
+
+        // display="none"
+        //
+        // http://www.w3.org/TR/SVG/painting.html#DisplayProperty
+        // "A value of display: none indicates that the given element
+        // and its children shall not be rendered directly"
+        if (
+            params.displayNone &&
+            item.hasAttr('display', 'none')
+        ) return false;
+
+        // opacity="0"
+        //
+        // http://www.w3.org/TR/SVG/masking.html#ObjectAndGroupOpacityProperties
+        if (
+            params.opacity0 &&
+            item.hasAttr('opacity', '0')
+        ) return false;
+
+        // Circles with zero radius
+        //
+        // http://www.w3.org/TR/SVG/shapes.html#CircleElementRAttribute
+        // "A value of zero disables rendering of the element"
+        //
+        // <circle r="0">
+        if (
+            params.circleR0 &&
+            item.isElem('circle') &&
+            item.isEmpty() &&
+            item.hasAttr('r', '0')
+        ) return false;
+
+        // Ellipse with zero x-axis radius
+        //
+        // http://www.w3.org/TR/SVG/shapes.html#EllipseElementRXAttribute
+        // "A value of zero disables rendering of the element"
+        //
+        // <ellipse rx="0">
+        if (
+            params.ellipseRX0 &&
+            item.isElem('ellipse') &&
+            item.isEmpty() &&
+            item.hasAttr('rx', '0')
+        ) return false;
+
+        // Ellipse with zero y-axis radius
+        //
+        // http://www.w3.org/TR/SVG/shapes.html#EllipseElementRYAttribute
+        // "A value of zero disables rendering of the element"
+        //
+        // <ellipse ry="0">
+        if (
+            params.ellipseRY0 &&
+            item.isElem('ellipse') &&
+            item.isEmpty() &&
+            item.hasAttr('ry', '0')
+        ) return false;
+
+        // Rectangle with zero width
+        //
+        // http://www.w3.org/TR/SVG/shapes.html#RectElementWidthAttribute
+        // "A value of zero disables rendering of the element"
+        //
+        // <rect width="0">
+        if (
+            params.rectWidth0 &&
+            item.isElem('rect') &&
+            item.isEmpty() &&
+            item.hasAttr('width', '0')
+        ) return false;
+
+        // Rectangle with zero height
+        //
+        // http://www.w3.org/TR/SVG/shapes.html#RectElementHeightAttribute
+        // "A value of zero disables rendering of the element"
+        //
+        // <rect height="0">
+        if (
+            params.rectHeight0 &&
+            params.rectWidth0 &&
+            item.isElem('rect') &&
+            item.isEmpty() &&
+            item.hasAttr('height', '0')
+        ) return false;
+
+        // Pattern with zero width
+        //
+        // http://www.w3.org/TR/SVG/pservers.html#PatternElementWidthAttribute
+        // "A value of zero disables rendering of the element (i.e., no paint is applied)"
+        //
+        // <pattern width="0">
+        if (
+            params.patternWidth0 &&
+            item.isElem('pattern') &&
+            item.hasAttr('width', '0')
+        ) return false;
+
+        // Pattern with zero height
+        //
+        // http://www.w3.org/TR/SVG/pservers.html#PatternElementHeightAttribute
+        // "A value of zero disables rendering of the element (i.e., no paint is applied)"
+        //
+        // <pattern height="0">
+        if (
+            params.patternHeight0 &&
+            item.isElem('pattern') &&
+            item.hasAttr('height', '0')
+        ) return false;
+
+        // Image with zero width
+        //
+        // http://www.w3.org/TR/SVG/struct.html#ImageElementWidthAttribute
+        // "A value of zero disables rendering of the element"
+        //
+        // <image width="0">
+        if (
+            params.imageWidth0 &&
+            item.isElem('image') &&
+            item.hasAttr('width', '0')
+        ) return false;
+
+        // Image with zero height
+        //
+        // http://www.w3.org/TR/SVG/struct.html#ImageElementHeightAttribute
+        // "A value of zero disables rendering of the element"
+        //
+        // <image height="0">
+        if (
+            params.imageHeight0 &&
+            item.isElem('image') &&
+            item.hasAttr('height', '0')
+        ) return false;
+
+        // Path with empty data
+        //
+        // http://www.w3.org/TR/SVG/paths.html#DAttribute
+        //
+        // <path d=""/>
+        if (
+            params.pathEmptyD &&
+            item.isElem('path') &&
+            (!item.hasAttr('d') || !regValidPath.test(item.attr('d').value))
+        ) return false;
+
+        // Polyline with empty points
+        //
+        // http://www.w3.org/TR/SVG/shapes.html#PolylineElementPointsAttribute
+        //
+        // <polyline points="">
+        if (
+            params.polylineEmptyPoints &&
+            item.isElem('polyline') &&
+            !item.hasAttr('points')
+        ) return false;
+
+        // Polygon with empty points
+        //
+        // http://www.w3.org/TR/SVG/shapes.html#PolygonElementPointsAttribute
+        //
+        // <polygon points="">
+        if (
+            params.polygonEmptyPoints &&
+            item.isElem('polygon') &&
+            !item.hasAttr('points')
+        ) return false;
+
+    }
+
+};
diff --git a/node_modules/svgo/plugins/removeMetadata.js b/node_modules/svgo/plugins/removeMetadata.js
new file mode 100644
index 00000000..fa7a5795
--- /dev/null
+++ b/node_modules/svgo/plugins/removeMetadata.js
@@ -0,0 +1,23 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'removes <metadata>';
+
+/**
+ * Remove <metadata>.
+ *
+ * http://www.w3.org/TR/SVG/metadata.html
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item) {
+
+    return !item.isElem('metadata');
+
+};
diff --git a/node_modules/svgo/plugins/removeNonInheritableGroupAttrs.js b/node_modules/svgo/plugins/removeNonInheritableGroupAttrs.js
new file mode 100644
index 00000000..f999d568
--- /dev/null
+++ b/node_modules/svgo/plugins/removeNonInheritableGroupAttrs.js
@@ -0,0 +1,40 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'removes non-inheritable group’s presentational attributes';
+
+var inheritableAttrs = require('./_collections').inheritableAttrs,
+    attrsGroups = require('./_collections').attrsGroups,
+    excludedAttrs = ['display', 'opacity'];
+
+/**
+ * Remove non-inheritable group's "presentation" attributes.
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item) {
+
+    if (item.isElem('g')) {
+
+        item.eachAttr(function(attr) {
+            if (
+                ~attrsGroups.presentation.indexOf(attr.name) &&
+                ~attrsGroups.graphicalEvent.indexOf(attr.name) &&
+                ~attrsGroups.core.indexOf(attr.name) &&
+                ~attrsGroups.conditionalProcessing.indexOf(attr.name) &&
+                !~excludedAttrs.indexOf(attr.name) &&
+                !~inheritableAttrs.indexOf(attr.name)
+            ) {
+                item.removeAttr(attr.name);
+            }
+        });
+
+    }
+
+};
diff --git a/node_modules/svgo/plugins/removeRasterImages.js b/node_modules/svgo/plugins/removeRasterImages.js
new file mode 100644
index 00000000..cbddebe3
--- /dev/null
+++ b/node_modules/svgo/plugins/removeRasterImages.js
@@ -0,0 +1,28 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = false;
+
+exports.description = 'removes raster images (disabled by default)';
+
+/**
+ * Remove raster images references in <image>.
+ *
+ * @see https://bugs.webkit.org/show_bug.cgi?id=63548
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item) {
+
+    if (
+        item.isElem('image') &&
+        item.hasAttrLocal('href', /(\.|image\/)(jpg|png|gif)/)
+    ) {
+        return false;
+    }
+
+};
diff --git a/node_modules/svgo/plugins/removeStyleElement.js b/node_modules/svgo/plugins/removeStyleElement.js
new file mode 100644
index 00000000..964ce45c
--- /dev/null
+++ b/node_modules/svgo/plugins/removeStyleElement.js
@@ -0,0 +1,23 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = false;
+
+exports.description = 'removes <style> element (disabled by default)';
+
+/**
+ * Remove <style>.
+ *
+ * http://www.w3.org/TR/SVG/styling.html#StyleElement
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Betsy Dupuis
+ */
+exports.fn = function(item) {
+
+    return !item.isElem('style');
+
+};
diff --git a/node_modules/svgo/plugins/removeTitle.js b/node_modules/svgo/plugins/removeTitle.js
new file mode 100644
index 00000000..3d077e45
--- /dev/null
+++ b/node_modules/svgo/plugins/removeTitle.js
@@ -0,0 +1,24 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = false;
+
+exports.description = 'removes <title> (disabled by default)';
+
+/**
+ * Remove <title>.
+ * Disabled by default cause it may be used for accessibility.
+ *
+ * https://developer.mozilla.org/en-US/docs/Web/SVG/Element/title
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Igor Kalashnikov
+ */
+exports.fn = function(item) {
+
+    return !item.isElem('title');
+
+};
diff --git a/node_modules/svgo/plugins/removeUnknownsAndDefaults.js b/node_modules/svgo/plugins/removeUnknownsAndDefaults.js
new file mode 100644
index 00000000..341b1fd7
--- /dev/null
+++ b/node_modules/svgo/plugins/removeUnknownsAndDefaults.js
@@ -0,0 +1,143 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'removes unknown elements content and attributes, removes attrs with default values';
+
+exports.params = {
+    unknownContent: true,
+    unknownAttrs: true,
+    defaultAttrs: true,
+    uselessOverrides: true,
+    keepDataAttrs: true
+};
+
+var collections = require('./_collections'),
+    elems = collections.elems,
+    attrsGroups = collections.attrsGroups,
+    elemsGroups = collections.elemsGroups,
+    attrsGroupsDefaults = collections.attrsGroupsDefaults,
+    attrsInheritable = collections.inheritableAttrs;
+
+// collect and extend all references
+for (var elem in elems) {
+    elem = elems[elem];
+
+    if (elem.attrsGroups) {
+        elem.attrs = elem.attrs || [];
+
+        elem.attrsGroups.forEach(function(attrsGroupName) {
+            elem.attrs = elem.attrs.concat(attrsGroups[attrsGroupName]);
+
+            var groupDefaults = attrsGroupsDefaults[attrsGroupName];
+
+            if (groupDefaults) {
+                elem.defaults = elem.defaults || {};
+
+                for (var attrName in groupDefaults) {
+                    elem.defaults[attrName] = groupDefaults[attrName];
+                }
+            }
+        });
+
+    }
+
+    if (elem.contentGroups) {
+        elem.content = elem.content || [];
+
+        elem.contentGroups.forEach(function(contentGroupName) {
+            elem.content = elem.content.concat(elemsGroups[contentGroupName]);
+        });
+    }
+}
+
+/**
+ * Remove unknown elements content and attributes,
+ * remove attributes with default values.
+ *
+ * @param {Object} item current iteration item
+ * @param {Object} params plugin params
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item, params) {
+
+    // elems w/o namespace prefix
+    if (item.isElem() && !item.prefix) {
+
+        var elem = item.elem;
+
+        // remove unknown element's content
+        if (
+            params.unknownContent &&
+            !item.isEmpty() &&
+            elems[elem] && // make sure we know of this element before checking its children
+            elem !== 'foreignObject' // Don't check foreignObject
+        ) {
+            item.content.forEach(function(content, i) {
+                if (
+                    content.isElem() &&
+                    !content.prefix &&
+                    (
+                        (
+                            elems[elem].content && // Do we have a record of its permitted content?
+                            elems[elem].content.indexOf(content.elem) === -1
+                        ) ||
+                        (
+                            !elems[elem].content && // we dont know about its permitted content
+                            !elems[content.elem] // check that we know about the element at all
+                        )
+                    )
+                ) {
+                    item.content.splice(i, 1);
+                }
+            });
+        }
+
+        // remove element's unknown attrs and attrs with default values
+        if (elems[elem] && elems[elem].attrs) {
+
+            item.eachAttr(function(attr) {
+
+                if (
+                    attr.name !== 'xmlns' &&
+                    (attr.prefix === 'xml' || !attr.prefix) &&
+                    (!params.keepDataAttrs || attr.name.indexOf('data-') != 0)
+                ) {
+                    if (
+                        // unknown attrs
+                        (
+                            params.unknownAttrs &&
+                            elems[elem].attrs.indexOf(attr.name) === -1
+                        ) ||
+                        // attrs with default values
+                        (
+                            params.defaultAttrs &&
+                            elems[elem].defaults &&
+                            elems[elem].defaults[attr.name] === attr.value && (
+                                attrsInheritable.indexOf(attr.name) < 0 ||
+                                !item.parentNode.computedAttr(attr.name)
+                            )
+                        ) ||
+                        // useless overrides
+                        (
+                            params.uselessOverrides &&
+                            attr.name !== 'transform' &&
+                            attrsInheritable.indexOf(attr.name) > -1 &&
+                            item.parentNode.computedAttr(attr.name, attr.value)
+                        )
+                    ) {
+                        item.removeAttr(attr.name);
+                    }
+                }
+
+            });
+
+        }
+
+    }
+
+};
diff --git a/node_modules/svgo/plugins/removeUnusedNS.js b/node_modules/svgo/plugins/removeUnusedNS.js
new file mode 100644
index 00000000..c4787915
--- /dev/null
+++ b/node_modules/svgo/plugins/removeUnusedNS.js
@@ -0,0 +1,107 @@
+'use strict';
+
+exports.type = 'full';
+
+exports.active = true;
+
+exports.description = 'removes unused namespaces declaration';
+
+/**
+ * Remove unused namespaces declaration.
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(data) {
+
+    var svgElem,
+        xmlnsCollection = [];
+
+    /**
+     * Remove namespace from collection.
+     *
+     * @param {String} ns namescape name
+     */
+    function removeNSfromCollection(ns) {
+
+        var pos = xmlnsCollection.indexOf(ns);
+
+        // if found - remove ns from the namespaces collection
+        if (pos > -1) {
+            xmlnsCollection.splice(pos, 1);
+        }
+
+    }
+
+    /**
+     * Bananas!
+     *
+     * @param {Array} items input items
+     *
+     * @return {Array} output items
+     */
+    function monkeys(items) {
+
+        var i = 0,
+            length = items.content.length;
+
+        while(i < length) {
+
+            var item = items.content[i];
+
+            if (item.isElem('svg')) {
+
+                item.eachAttr(function(attr) {
+                    // collect namespaces
+                    if (attr.prefix === 'xmlns' && attr.local) {
+                        xmlnsCollection.push(attr.local);
+                    }
+                });
+
+                // if svg element has ns-attr
+                if (xmlnsCollection.length) {
+                    // save svg element
+                    svgElem = item;
+                }
+
+            } else if (xmlnsCollection.length) {
+
+                // check item for the ns-attrs
+                if (item.prefix) {
+                    removeNSfromCollection(item.prefix);
+                }
+
+                // check each attr for the ns-attrs
+                item.eachAttr(function(attr) {
+                    removeNSfromCollection(attr.prefix);
+                });
+
+            }
+
+            // if nothing is found - go deeper
+            if (xmlnsCollection.length && item.content) {
+                monkeys(item);
+            }
+
+            i++;
+
+        }
+
+        return items;
+
+    }
+
+    data = monkeys(data);
+
+    // remove svg element ns-attributes if they are not used even once
+    if (xmlnsCollection.length) {
+        xmlnsCollection.forEach(function(name) {
+            svgElem.removeAttr('xmlns:' + name);
+        });
+    }
+
+    return data;
+
+};
diff --git a/node_modules/svgo/plugins/removeUselessDefs.js b/node_modules/svgo/plugins/removeUselessDefs.js
new file mode 100644
index 00000000..b8c97a52
--- /dev/null
+++ b/node_modules/svgo/plugins/removeUselessDefs.js
@@ -0,0 +1,51 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'removes elements in <defs> without id';
+
+var nonRendering = require('./_collections').elemsGroups.nonRendering,
+    defs;
+
+/**
+ * Removes content of defs and properties that aren't rendered directly without ids.
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Lev Solntsev
+ */
+exports.fn = function(item) {
+
+    if (item.isElem('defs')) {
+
+        defs = item;
+        item.content = (item.content || []).reduce(getUsefulItems, []);
+
+        if (item.isEmpty()) return false;
+
+    } else if (item.isElem(nonRendering) && !item.hasAttr('id')) {
+
+        return false;
+
+    }
+
+};
+
+function getUsefulItems(usefulItems, item) {
+
+    if (item.hasAttr('id') || item.isElem('style')) {
+
+        usefulItems.push(item);
+        item.parentNode = defs;
+
+    } else if (!item.isEmpty()) {
+
+        item.content.reduce(getUsefulItems, usefulItems);
+
+    }
+
+    return usefulItems;
+}
diff --git a/node_modules/svgo/plugins/removeUselessStrokeAndFill.js b/node_modules/svgo/plugins/removeUselessStrokeAndFill.js
new file mode 100644
index 00000000..47090eb8
--- /dev/null
+++ b/node_modules/svgo/plugins/removeUselessStrokeAndFill.js
@@ -0,0 +1,92 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'removes useless stroke and fill attributes';
+
+exports.params = {
+    stroke: true,
+    fill: true
+};
+
+var shape = require('./_collections').elemsGroups.shape,
+    regStrokeProps = /^stroke/,
+    regFillProps = /^fill-/,
+    styleOrScript = ['style', 'script'],
+    hasStyleOrScript = false;
+
+/**
+ * Remove useless stroke and fill attrs.
+ *
+ * @param {Object} item current iteration item
+ * @param {Object} params plugin params
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item, params) {
+
+    if (item.isElem(styleOrScript)) {
+        hasStyleOrScript = true;
+    }
+
+    if (!hasStyleOrScript && item.isElem(shape) && !item.computedAttr('id')) {
+
+        var stroke = params.stroke && item.computedAttr('stroke'),
+            fill = params.fill && !item.computedAttr('fill', 'none');
+
+        // remove stroke*
+        if (
+            params.stroke &&
+            (!stroke ||
+                stroke == 'none' ||
+                item.computedAttr('stroke-opacity', '0') ||
+                item.computedAttr('stroke-width', '0')
+            )
+        ) {
+            var parentStroke = item.parentNode.computedAttr('stroke'),
+                declineStroke = parentStroke && parentStroke != 'none';
+
+            item.eachAttr(function(attr) {
+                if (regStrokeProps.test(attr.name)) {
+                    item.removeAttr(attr.name);
+                }
+            });
+
+            if (declineStroke) item.addAttr({
+                name: 'stroke',
+                value: 'none',
+                prefix: '',
+                local: 'stroke'
+            });
+        }
+
+        // remove fill*
+        if (
+            params.fill &&
+            (!fill || item.computedAttr('fill-opacity', '0'))
+        ) {
+            item.eachAttr(function(attr) {
+                if (regFillProps.test(attr.name)) {
+                    item.removeAttr(attr.name);
+                }
+            });
+
+            if (fill) {
+                if (item.hasAttr('fill'))
+                    item.attr('fill').value = 'none';
+                else
+                    item.addAttr({
+                        name: 'fill',
+                        value: 'none',
+                        prefix: '',
+                        local: 'fill'
+                    });
+            }
+        }
+
+    }
+
+};
diff --git a/node_modules/svgo/plugins/removeViewBox.js b/node_modules/svgo/plugins/removeViewBox.js
new file mode 100644
index 00000000..33595656
--- /dev/null
+++ b/node_modules/svgo/plugins/removeViewBox.js
@@ -0,0 +1,49 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = false;
+
+exports.description = 'removes viewBox attribute when possible (disabled by default)';
+
+var regViewBox = /^0\s0\s([\-+]?\d*\.?\d+([eE][\-+]?\d+)?)\s([\-+]?\d*\.?\d+([eE][\-+]?\d+)?)$/,
+    viewBoxElems = ['svg', 'pattern'];
+
+/**
+ * Remove viewBox attr which coincides with a width/height box.
+ *
+ * @see http://www.w3.org/TR/SVG/coords.html#ViewBoxAttribute
+ *
+ * @example
+ * <svg width="100" height="50" viewBox="0 0 100 50">
+ *             ⬇
+ * <svg width="100" height="50">
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item) {
+
+    if (
+        item.isElem(viewBoxElems) &&
+        item.hasAttr('viewBox') &&
+        item.hasAttr('width') &&
+        item.hasAttr('height')
+    ) {
+
+        var match = item.attr('viewBox').value.match(regViewBox);
+
+        if (match) {
+            if (
+                item.attr('width').value === match[1] &&
+                item.attr('height').value === match[3]
+            ) {
+                item.removeAttr('viewBox');
+            }
+        }
+
+    }
+
+};
diff --git a/node_modules/svgo/plugins/removeXMLNS.js b/node_modules/svgo/plugins/removeXMLNS.js
new file mode 100644
index 00000000..afda99d3
--- /dev/null
+++ b/node_modules/svgo/plugins/removeXMLNS.js
@@ -0,0 +1,28 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = false;
+
+exports.description = 'removes xmlns attribute (for inline svg, disabled by default)';
+
+/**
+ * Remove the xmlns attribute when present.
+ *
+ * @example
+ * <svg viewBox="0 0 100 50" xmlns="http://www.w3.org/2000/svg">
+ *   ↓
+ * <svg viewBox="0 0 100 50">
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if true, xmlns will be filtered out
+ *
+ * @author Ricardo Tomasi
+ */
+exports.fn = function(item) {
+
+    if (item.isElem('svg') && item.hasAttr('xmlns')) {
+        item.removeAttr('xmlns');
+    }
+
+};
\ No newline at end of file
diff --git a/node_modules/svgo/plugins/removeXMLProcInst.js b/node_modules/svgo/plugins/removeXMLProcInst.js
new file mode 100644
index 00000000..afd425d5
--- /dev/null
+++ b/node_modules/svgo/plugins/removeXMLProcInst.js
@@ -0,0 +1,24 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = true;
+
+exports.description = 'removes XML processing instructions';
+
+/**
+ * Remove XML Processing Instruction.
+ *
+ * @example
+ * <?xml version="1.0" encoding="utf-8"?>
+ *
+ * @param {Object} item current iteration item
+ * @return {Boolean} if false, item will be filtered out
+ *
+ * @author Kir Belevich
+ */
+exports.fn = function(item) {
+
+    return !(item.processinginstruction && item.processinginstruction.name === 'xml');
+
+};
diff --git a/node_modules/svgo/plugins/sortAttrs.js b/node_modules/svgo/plugins/sortAttrs.js
new file mode 100644
index 00000000..221a4bf5
--- /dev/null
+++ b/node_modules/svgo/plugins/sortAttrs.js
@@ -0,0 +1,81 @@
+'use strict';
+
+exports.type = 'perItem';
+
+exports.active = false;
+
+exports.description = 'sorts element attributes (disabled by default)';
+
+exports.params = {
+	order: [
+		'id',
+		'width', 'height',
+		'x', 'x1', 'x2',
+		'y', 'y1', 'y2',
+		'cx', 'cy', 'r',
+		'fill', 'stroke', 'marker',
+		'd', 'points'
+	]
+};
+
+/**
+ * Sort element attributes for epic readability.
+ *
+ * @param {Object} item current iteration item
+ * @param {Object} params plugin params
+ *
+ * @author Nikolay Frantsev
+ */
+exports.fn = function(item, params) {
+
+	var attrs = [],
+		sorted = {},
+		orderlen = params.order.length + 1;
+
+	if (item.elem) {
+
+		item.eachAttr(function(attr) {
+			attrs.push(attr);
+		});
+
+		attrs.sort(function(a, b) {
+			if (a.prefix != b.prefix) {
+				// xmlns attributes implicitly have the prefix xmlns
+				if (a.prefix == 'xmlns')
+					return -1;
+				if (b.prefix == 'xmlns')
+					return 1;
+				return a.prefix < b.prefix ? -1 : 1;
+			}
+
+			var aindex = orderlen;
+			var bindex = orderlen;
+
+			for (var i = 0; i < params.order.length; i++) {
+				if (a.name == params.order[i]) {
+					aindex = i;
+				} else if (a.name.indexOf(params.order[i] + '-') === 0) {
+					aindex = i + .5;
+				}
+				if (b.name == params.order[i]) {
+					bindex = i;
+				} else if (b.name.indexOf(params.order[i] + '-') === 0) {
+					bindex = i + .5;
+				}
+			}
+
+			if (aindex != bindex) {
+				return aindex - bindex;
+			}
+			return a.name < b.name ? -1 : 1;
+		});
+
+		attrs.forEach(function (attr) {
+			sorted[attr.name] = attr;
+		});
+
+		item.attrs = sorted;
+
+	}
+
+};
diff --git a/node_modules/svgo/plugins/transformsWithOnePath.js b/node_modules/svgo/plugins/transformsWithOnePath.js
new file mode 100644
index 00000000..f4dec7e6
--- /dev/null
+++ b/node_modules/svgo/plugins/transformsWithOnePath.js
@@ -0,0 +1,327 @@
+'use strict';
+
+/*
+ * Thanks to http://fontello.com project for sponsoring this plugin
+ */
+
+exports.type = 'full';
+
+exports.active = false;
+
+exports.description = 'performs a set of operations on SVG with one path inside (disabled by default)';
+
+exports.params = {
+    // width and height to resize SVG and rescale inner Path
+    width: false,
+    height: false,
+
+    // scale inner Path without resizing SVG
+    scale: false,
+
+    // shiftX/Y inner Path
+    shiftX: false,
+    shiftY: false,
+
+    // crop SVG width along the real width of inner Path
+    hcrop: false,
+
+    // vertical center inner Path inside SVG height
+    vcenter: false,
+
+    // stringify params
+    floatPrecision: 3,
+    leadingZero: true,
+    negativeExtraSpace: true
+};
+
+var _path = require('./_path.js'),
+    relative2absolute = _path.relative2absolute,
+    computeCubicBoundingBox = _path.computeCubicBoundingBox,
+    computeQuadraticBoundingBox = _path.computeQuadraticBoundingBox,
+    applyTransforms = _path.applyTransforms,
+    js2path = _path.js2path,
+    path2js = _path.path2js,
+    EXTEND = require('whet.extend');
+
+exports.fn = function(data, params) {
+
+    data.content.forEach(function(item) {
+
+        // only for SVG with one Path inside
+        if (item.isElem('svg') &&
+            item.content.length === 1 &&
+            item.content[0].isElem('path')
+        ) {
+
+            var svgElem = item,
+                pathElem = svgElem.content[0],
+                // get absoluted Path data
+                path = relative2absolute(EXTEND(true, [], path2js(pathElem))),
+                xs = [],
+                ys = [],
+                cubicСontrolPoint = [0, 0],
+                quadraticСontrolPoint = [0, 0],
+                lastPoint = [0, 0],
+                cubicBoundingBox,
+                quadraticBoundingBox,
+                i,
+                segment;
+
+            path.forEach(function(pathItem) {
+
+                // ML
+                if ('ML'.indexOf(pathItem.instruction) > -1) {
+
+                    for (i = 0; i < pathItem.data.length; i++) {
+                        if (i % 2 === 0) {
+                            xs.push(pathItem.data[i]);
+                        } else {
+                            ys.push(pathItem.data[i]);
+                        }
+                    }
+
+                    lastPoint = cubicСontrolPoint = quadraticСontrolPoint = pathItem.data.slice(-2);
+
+                // H
+                } else if (pathItem.instruction === 'H') {
+
+                    pathItem.data.forEach(function(d) {
+                        xs.push(d);
+                    });
+
+                    lastPoint[0] = cubicСontrolPoint[0] = quadraticСontrolPoint[0] = pathItem.data[pathItem.data.length - 2];
+
+                // V
+                } else if (pathItem.instruction === 'V') {
+
+                    pathItem.data.forEach(function(d) {
+                        ys.push(d);
+                    });
+
+                    lastPoint[1] = cubicСontrolPoint[1] = quadraticСontrolPoint[1] = pathItem.data[pathItem.data.length - 1];
+
+                // C
+                } else if (pathItem.instruction === 'C') {
+
+                    for (i = 0; i < pathItem.data.length; i += 6) {
+
+                        segment = pathItem.data.slice(i, i + 6);
+
+                        cubicBoundingBox = computeCubicBoundingBox.apply(this, lastPoint.concat(segment));
+
+                        xs.push(cubicBoundingBox.minx);
+                        xs.push(cubicBoundingBox.maxx);
+
+                        ys.push(cubicBoundingBox.miny);
+                        ys.push(cubicBoundingBox.maxy);
+
+                        // reflected control point for the next possible S
+                        cubicСontrolPoint = [
+                            2 * segment[4] - segment[2],
+                            2 * segment[5] - segment[3]
+                        ];
+
+                        lastPoint = segment.slice(-2);
+
+                    }
+
+                // S
+                } else if (pathItem.instruction === 'S') {
+
+                    for (i = 0; i < pathItem.data.length; i += 4) {
+
+                        segment = pathItem.data.slice(i, i + 4);
+
+                        cubicBoundingBox = computeCubicBoundingBox.apply(this, lastPoint.concat(cubicСontrolPoint).concat(segment));
+
+                        xs.push(cubicBoundingBox.minx);
+                        xs.push(cubicBoundingBox.maxx);
+
+                        ys.push(cubicBoundingBox.miny);
+                        ys.push(cubicBoundingBox.maxy);
+
+                        // reflected control point for the next possible S
+                        cubicСontrolPoint = [
+                            2 * segment[2] - cubicСontrolPoint[0],
+                            2 * segment[3] - cubicСontrolPoint[1],
+                        ];
+
+                        lastPoint = segment.slice(-2);
+
+                    }
+
+                // Q
+                } else if (pathItem.instruction === 'Q') {
+
+                    for (i = 0; i < pathItem.data.length; i += 4) {
+
+                        segment = pathItem.data.slice(i, i + 4);
+
+                        quadraticBoundingBox = computeQuadraticBoundingBox.apply(this, lastPoint.concat(segment));
+
+                        xs.push(quadraticBoundingBox.minx);
+                        xs.push(quadraticBoundingBox.maxx);
+
+                        ys.push(quadraticBoundingBox.miny);
+                        ys.push(quadraticBoundingBox.maxy);
+
+                        // reflected control point for the next possible T
+                        quadraticСontrolPoint = [
+                            2 * segment[2] - segment[0],
+                            2 * segment[3] - segment[1]
+                        ];
+
+                        lastPoint = segment.slice(-2);
+
+                    }
+
+                // S
+                } else if (pathItem.instruction === 'T') {
+
+                    for (i = 0; i < pathItem.data.length; i += 2) {
+
+                        segment = pathItem.data.slice(i, i + 2);
+
+                        quadraticBoundingBox = computeQuadraticBoundingBox.apply(this, lastPoint.concat(quadraticСontrolPoint).concat(segment));
+
+                        xs.push(quadraticBoundingBox.minx);
+                        xs.push(quadraticBoundingBox.maxx);
+
+                        ys.push(quadraticBoundingBox.miny);
+                        ys.push(quadraticBoundingBox.maxy);
+
+                        // reflected control point for the next possible T
+                        quadraticСontrolPoint = [
+                            2 * segment[0] - quadraticСontrolPoint[0],
+                            2 * segment[1] - quadraticСontrolPoint[1]
+                        ];
+
+                        lastPoint = segment.slice(-2);
+
+                    }
+
+                }
+
+            });
+
+            var xmin = Math.min.apply(this, xs).toFixed(params.floatPrecision),
+                xmax = Math.max.apply(this, xs).toFixed(params.floatPrecision),
+                ymin = Math.min.apply(this, ys).toFixed(params.floatPrecision),
+                ymax = Math.max.apply(this, ys).toFixed(params.floatPrecision),
+                svgWidth = +svgElem.attr('width').value,
+                svgHeight = +svgElem.attr('height').value,
+                realWidth = Math.round(xmax - xmin),
+                realHeight = Math.round(ymax - ymin),
+                transform = '',
+                scale;
+
+            // width & height
+            if (params.width && params.height) {
+
+                scale = Math.min(params.width / svgWidth, params.height / svgHeight);
+
+                realWidth = realWidth * scale;
+                realHeight = realHeight * scale;
+
+                svgWidth = svgElem.attr('width').value = params.width;
+                svgHeight = svgElem.attr('height').value = params.height;
+
+                transform += ' scale(' + scale + ')';
+
+            // width
+            } else if (params.width && !params.height) {
+
+                scale = params.width / svgWidth;
+
+                realWidth = realWidth * scale;
+                realHeight = realHeight * scale;
+
+                svgWidth = svgElem.attr('width').value = params.width;
+                svgHeight = svgElem.attr('height').value = svgHeight * scale;
+
+                transform += ' scale(' + scale + ')';
+
+            // height
+            } else if (params.height && !params.width) {
+
+                scale = params.height / svgHeight;
+
+                realWidth = realWidth * scale;
+                realHeight = realHeight * scale;
+
+                svgWidth = svgElem.attr('width').value = svgWidth * scale;
+                svgHeight = svgElem.attr('height').value = params.height;
+
+                transform += ' scale(' + scale + ')';
+
+            }
+
+            // shiftX
+            if (params.shiftX) {
+                transform += ' translate(' + realWidth * params.shiftX + ', 0)';
+            }
+
+            // shiftY
+            if (params.shiftY) {
+                transform += ' translate(0, ' + realHeight * params.shiftY + ')';
+            }
+
+            // scale
+            if (params.scale) {
+                scale = params.scale;
+
+                var shiftX = svgWidth / 2,
+                    shiftY = svgHeight / 2;
+
+                realWidth = realWidth * scale;
+                realHeight = realHeight * scale;
+
+                if (params.shiftX || params.shiftY) {
+                    transform += ' scale(' + scale + ')';
+                } else {
+                    transform += ' translate(' + shiftX + ' ' + shiftY + ') scale(' + scale + ') translate(-' + shiftX + ' -' + shiftY + ')';
+                }
+            }
+
+            // hcrop
+            if (params.hcrop) {
+                transform += ' translate(' + (-xmin) + ' 0)';
+
+                svgElem.attr('width').value = realWidth;
+            }
+
+            // vcenter
+            if (params.vcenter) {
+                transform += ' translate(0 ' + (((svgHeight - realHeight) / 2) - ymin) + ')';
+            }
+
+            if (transform) {
+                pathElem.addAttr({
+                    name: 'transform',
+                    prefix: '',
+                    local: 'transform',
+                    value: transform
+                });
+
+                path = applyTransforms(pathElem, pathElem.pathJS, true, params.floatPrecision);
+
+                // transformed data rounding
+                path.forEach(function(pathItem) {
+                    if (pathItem.data) {
+                        pathItem.data = pathItem.data.map(function(num) {
+                            return +num.toFixed(params.floatPrecision);
+                        });
+                    }
+                });
+
+                // save new
+                js2path(pathElem, path, params);
+            }
+
+        }
+
+    });
+
+    return data;
+
+};
-- 
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