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diff --git a/node_modules/postcss-convert-values/CHANGELOG.md b/node_modules/postcss-convert-values/CHANGELOG.md
new file mode 100644
index 00000000..8f90b951
--- /dev/null
+++ b/node_modules/postcss-convert-values/CHANGELOG.md
@@ -0,0 +1,146 @@
+# 2.6.1
+
+* Resolves an issue where IE hacks were being removed from `0` values
+  (thanks to @Justineo).
+
+# 2.6.0
+
+* Added clamping of the values for the `shape-image-threshold` property, using
+  the same logic as introduced in version `2.5.0`.
+
+# 2.5.0
+
+* Added clamping of the values for the `opacity` property to the `0-1` range.
+  For example, this will convert `opacity: 1.1` to `opacity: 1`.
+
+# 2.4.1
+
+* Resolves an issue where the units would be stripped from zero values in
+  custom properties (thanks to @jgerigmeyer).
+
+# 2.4.0
+
+* Added a `precision` option to enable rounding of decimal places for
+  `px` values.
+
+# 2.3.6
+
+* Resolves an issue with the last patch where `height: 0em` was not being
+  converted to `height: 0`.
+
+# 2.3.5
+
+* Resolves an issue where certain properties inside `@keyframes` rules would
+  break animation in IE due to the percentage being stripped. Now, the
+  percentage is preserved for these properties.
+
+# 2.3.4
+
+* Does not convert `height:0%` to `height:0` (and the same for `max-height`), as
+  they produce different results.
+
+# 2.3.3
+
+* Updates postcss-value-parser to version 3 (thanks to @TrySound).
+
+# 2.3.2
+
+* Fixed a regression where `0%` in color functions was being transformed to `0`
+  (thanks to @TrySound).
+
+# 2.3.1
+
+* Fixed a behaviour where `0deg` was being converted to `0`.
+
+# 2.3.0
+
+* Added an option to convert between `turn` & `deg` (thanks to @TrySound).
+
+# 2.2.1
+
+* Fixes a behaviour where the module would remove units from zero values inside
+  calc functions (thanks to @marek-saji & @TrySound).
+
+# 2.2.0
+
+* Renames `opts.convertLength` & `opts.convertTime` to
+  `opts.length` & `opts.time`; the old options will now print deprecation
+  warnings (thanks to @TrySound).
+
+# 2.1.0
+
+* Adds options to enable/disable unit conversion for time & length values.
+
+# 2.0.1
+
+* Bump postcss-value-parser to `2.0.2`.
+
+# 2.0.0
+
+* Upgraded to PostCSS 5.
+
+# 1.3.1
+
+* Fixes an issue where the module would convert values in gradient/url functions
+  since 1.3.0.
+
+# 1.3.0
+
+* Converted the module to use ES6.
+* balanced-match, css-list & some integrated code has been replaced with
+  postcss-value-parser; reducing the number of moving parts in this module, and
+  providing a more futureproof way of parsing CSS numeric values.
+
+# 1.2.5
+
+* Fixes an issue where uppercase units (such as PX) were being deleted.
+
+# 1.2.4
+
+* Fixes convert not px or ms
+
+# 1.2.3
+
+* Adds support for `ch` units; previously they were removed.
+* Upgrades css-list to `0.1.0`, code tidied up.
+
+# 1.2.2
+
+* Added support for viewport units (thanks to @TrySound).
+
+# 1.2.1
+
+* Fixes regressions introduced by the previous patch. Better support for
+  negative value transforms.
+
+# 1.2.0
+
+* Adds support for slash/comma separated values (thanks to @TrySound).
+
+# 1.1.1
+
+* Fixes an issue where trailing zeroes were not being removed in
+  values that were not `0` (thanks to @TrySound).
+
+# 1.1.0
+
+* Adds support for removing leading zeroes from `rem` values
+  (thanks to @tunnckoCore).
+
+# 1.0.3
+
+* Fixed a bug where filenames were being incorrectly transformed.
+
+# 1.0.2
+
+* Fixed a bug where `1.` and `.0` were not being optimised to `1` and `0`,
+  respectively.
+
+# 1.0.1
+
+* Fixed a bug where `undefined` would be stringified as the unit value, if the
+  value did not have a unit.
+
+# 1.0.0
+
+* Initial release.
diff --git a/node_modules/postcss-convert-values/LICENSE-MIT b/node_modules/postcss-convert-values/LICENSE-MIT
new file mode 100644
index 00000000..fd0e863a
--- /dev/null
+++ b/node_modules/postcss-convert-values/LICENSE-MIT
@@ -0,0 +1,22 @@
+Copyright (c) Ben Briggs <beneb.info@gmail.com> (http://beneb.info)
+
+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/postcss-convert-values/README.md b/node_modules/postcss-convert-values/README.md
new file mode 100644
index 00000000..25107b54
--- /dev/null
+++ b/node_modules/postcss-convert-values/README.md
@@ -0,0 +1,106 @@
+# [postcss][postcss]-convert-values [![Build Status](https://travis-ci.org/ben-eb/postcss-convert-values.svg?branch=master)][ci] [![NPM version](https://badge.fury.io/js/postcss-convert-values.svg)][npm] [![Dependency Status](https://gemnasium.com/ben-eb/postcss-convert-values.svg)][deps]
+
+> Convert values with PostCSS (e.g. ms -> s)
+
+## Install
+
+With [npm](https://npmjs.org/package/postcss-convert-values) do:
+
+```
+npm install postcss-convert-values --save
+```
+
+## Example
+
+This plugin reduces CSS size by converting values to use different units
+where possible; for example, `500ms` can be represented as `.5s`. You can
+read more about these units in [this article][csstricks].
+
+### Input
+
+```css
+h1 {
+    font-size: 16px;
+    width: 0em
+}
+```
+
+### Output
+
+```css
+h1 {
+    font-size: 1pc;
+    width: 0
+}
+```
+
+Note that this plugin only covers conversions for duration and absolute length
+values. For color conversions, use [postcss-colormin][colormin].
+
+## API
+
+### convertValues([options])
+
+#### options
+
+##### length
+
+Type: `boolean`
+Default: `true`
+
+Pass `false` to disable conversion from `px` to other absolute length units,
+such as `pc` & `pt` & vice versa.
+
+##### time
+
+Type: `boolean`
+Default: `true`
+
+Pass `false` to disable conversion from `ms` to `s` & vice versa.
+
+##### angle
+
+Type: `boolean`
+Default: `true`
+
+Pass `false` to disable conversion from `deg` to `turn` & vice versa.
+
+##### precision
+
+Type: `boolean|number`
+Default: `false`
+
+Specify any numeric value here to round `px` values to that many decimal places;
+for example, using `{precision: 2}` will round `6.66667px` to `6.67px`, and
+`{precision: 0}` will round it to `7px`. Passing `false` (the default) will
+leave these values as is.
+
+It is recommended for most use cases to set this option to `2`.
+
+
+## Contributors
+
+Thanks goes to these wonderful people ([emoji key](https://github.com/kentcdodds/all-contributors#emoji-key)):
+
+<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
+| [<img src="https://avatars.githubusercontent.com/u/1282980?v=3" width="100px;"/><br /><sub>Ben Briggs</sub>](http://beneb.info)<br />[💻](https://github.com/ben-eb/postcss-convert-values/commits?author=ben-eb) [📖](https://github.com/ben-eb/postcss-convert-values/commits?author=ben-eb) 👀 [⚠️](https://github.com/ben-eb/postcss-convert-values/commits?author=ben-eb) | [<img src="https://avatars.githubusercontent.com/u/5635476?v=3" width="100px;"/><br /><sub>Bogdan Chadkin</sub>](https://github.com/TrySound)<br />[💻](https://github.com/ben-eb/postcss-convert-values/commits?author=TrySound) [📖](https://github.com/ben-eb/postcss-convert-values/commits?author=TrySound) 👀 [⚠️](https://github.com/ben-eb/postcss-convert-values/commits?author=TrySound) | [<img src="https://avatars.githubusercontent.com/u/177485?v=3" width="100px;"/><br /><sub>Roman Komarov</sub>](http://kizu.ru/en/)<br />[🐛](https://github.com/ben-eb/postcss-convert-values/issues?q=author%3Akizu) | [<img src="https://avatars.githubusercontent.com/u/5103477?v=3" width="100px;"/><br /><sub>Dmitry Kiselyov</sub>](http://codepen.io/dmitrykiselyov)<br />[🐛](https://github.com/ben-eb/postcss-convert-values/issues?q=author%3Admitrykiselyov) | [<img src="https://avatars.githubusercontent.com/u/5038030?v=3" width="100px;"/><br /><sub>Charlike Mike Reagent</sub>](http://www.tunnckocore.tk)<br />[💻](https://github.com/ben-eb/postcss-convert-values/commits?author=tunnckoCore) [⚠️](https://github.com/ben-eb/postcss-convert-values/commits?author=tunnckoCore) | [<img src="https://avatars.githubusercontent.com/u/815848?v=3" width="100px;"/><br /><sub>Vyacheslav Shebanov</sub>](https://github.com/Termina1)<br />[📖](https://github.com/ben-eb/postcss-convert-values/commits?author=Termina1) | [<img src="https://avatars.githubusercontent.com/u/192323?v=3" width="100px;"/><br /><sub>Marek ‘saji’ Augustynowicz</sub>](http://twitter.com/saji_)<br />[💻](https://github.com/ben-eb/postcss-convert-values/commits?author=marek-saji) [⚠️](https://github.com/ben-eb/postcss-convert-values/commits?author=marek-saji) |
+| :---: | :---: | :---: | :---: | :---: | :---: | :---: |
+| [<img src="https://avatars.githubusercontent.com/u/552316?v=3" width="100px;"/><br /><sub>Jonny Gerig Meyer</sub>](www.oddbird.net)<br />[💻](https://github.com/ben-eb/postcss-convert-values/commits?author=jgerigmeyer) [⚠️](https://github.com/ben-eb/postcss-convert-values/commits?author=jgerigmeyer) | [<img src="https://avatars.githubusercontent.com/u/1726061?v=3" width="100px;"/><br /><sub>GU Yiling</sub>](http://lync.in/)<br />[💻](https://github.com/ben-eb/postcss-convert-values/commits?author=Justineo) [⚠️](https://github.com/ben-eb/postcss-convert-values/commits?author=Justineo) |
+<!-- ALL-CONTRIBUTORS-LIST:END -->
+
+This project follows the [all-contributors] specification. Contributions of
+any kind welcome!
+
+## License
+
+MIT © [Ben Briggs](http://beneb.info)
+
+
+[all-contributors]: https://github.com/kentcdodds/all-contributors
+[ci]:       https://travis-ci.org/ben-eb/postcss-convert-values
+[colormin]: https://github.com/ben-eb/postcss-colormin
+[deps]:     https://gemnasium.com/ben-eb/postcss-convert-values
+[npm]:      http://badge.fury.io/js/postcss-convert-values
+[postcss]:  https://github.com/postcss/postcss
+
+[csstricks]: https://css-tricks.com/the-lengths-of-css/
diff --git a/node_modules/postcss-convert-values/dist/index.js b/node_modules/postcss-convert-values/dist/index.js
new file mode 100644
index 00000000..a4c436b0
--- /dev/null
+++ b/node_modules/postcss-convert-values/dist/index.js
@@ -0,0 +1,108 @@
+'use strict';
+
+exports.__esModule = true;
+
+var _postcss = require('postcss');
+
+var _postcss2 = _interopRequireDefault(_postcss);
+
+var _postcssValueParser = require('postcss-value-parser');
+
+var _postcssValueParser2 = _interopRequireDefault(_postcssValueParser);
+
+var _convert = require('./lib/convert');
+
+var _convert2 = _interopRequireDefault(_convert);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+var LENGTH_UNITS = ['em', 'ex', 'ch', 'rem', 'vw', 'vh', 'vmin', 'vmax', 'cm', 'mm', 'q', 'in', 'pt', 'pc', 'px'];
+
+function parseWord(node, opts, keepZeroUnit) {
+    var pair = (0, _postcssValueParser.unit)(node.value);
+    if (pair) {
+        var num = Number(pair.number);
+        var u = pair.unit.toLowerCase();
+        if (num === 0) {
+            node.value = keepZeroUnit || !~LENGTH_UNITS.indexOf(u) && u !== '%' ? 0 + u : 0;
+        } else {
+            node.value = (0, _convert2.default)(num, u, opts);
+
+            if (typeof opts.precision === 'number' && u === 'px' && ~pair.number.indexOf('.')) {
+                var precision = Math.pow(10, opts.precision);
+                node.value = Math.round(parseFloat(node.value) * precision) / precision + u;
+            }
+        }
+    }
+}
+
+function clampOpacity(node) {
+    var pair = (0, _postcssValueParser.unit)(node.value);
+    if (!pair) {
+        return;
+    }
+    var num = Number(pair.number);
+    if (num > 1) {
+        node.value = 1 + pair.unit;
+    } else if (num < 0) {
+        node.value = 0 + pair.unit;
+    }
+}
+
+function shouldStripPercent(_ref) {
+    var value = _ref.value,
+        prop = _ref.prop,
+        parent = _ref.parent;
+
+    return ~value.indexOf('%') && (prop === 'max-height' || prop === 'height') || parent.parent && parent.parent.name === 'keyframes' && prop === 'stroke-dasharray' || prop === 'stroke-dashoffset' || prop === 'stroke-width';
+}
+
+function transform(opts) {
+    return function (decl) {
+        var prop = decl.prop;
+
+        if (~prop.indexOf('flex') || prop.indexOf('--') === 0) {
+            return;
+        }
+
+        decl.value = (0, _postcssValueParser2.default)(decl.value).walk(function (node) {
+            if (node.type === 'word') {
+                parseWord(node, opts, shouldStripPercent(decl));
+                if (prop === 'opacity' || prop === 'shape-image-threshold') {
+                    clampOpacity(node);
+                }
+            } else if (node.type === 'function') {
+                if (node.value === 'calc' || node.value === 'hsl' || node.value === 'hsla') {
+                    (0, _postcssValueParser.walk)(node.nodes, function (n) {
+                        if (n.type === 'word') {
+                            parseWord(n, opts, true);
+                        }
+                    });
+                    return false;
+                }
+                if (node.value === 'url') {
+                    return false;
+                }
+            }
+        }).toString();
+    };
+}
+
+var plugin = 'postcss-convert-values';
+
+exports.default = _postcss2.default.plugin(plugin, function () {
+    var opts = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : { precision: false };
+
+    if (opts.length === undefined && opts.convertLength !== undefined) {
+        console.warn(plugin + ': `convertLength` option is deprecated. Use `length`');
+        opts.length = opts.convertLength;
+    }
+    if (opts.length === undefined && opts.convertTime !== undefined) {
+        console.warn(plugin + ': `convertTime` option is deprecated. Use `time`');
+        opts.time = opts.convertTime;
+    }
+    return function (css) {
+        return css.walkDecls(transform(opts));
+    };
+});
+module.exports = exports['default'];
\ No newline at end of file
diff --git a/node_modules/postcss-convert-values/dist/lib/convert.js b/node_modules/postcss-convert-values/dist/lib/convert.js
new file mode 100644
index 00000000..91400bc7
--- /dev/null
+++ b/node_modules/postcss-convert-values/dist/lib/convert.js
@@ -0,0 +1,88 @@
+'use strict';
+
+exports.__esModule = true;
+
+exports.default = function (number, unit, _ref) {
+    var time = _ref.time,
+        length = _ref.length,
+        angle = _ref.angle;
+
+    var value = dropLeadingZero(number) + (unit ? unit : '');
+    var converted = void 0;
+
+    if (length !== false && unit in lengthConv) {
+        converted = transform(number, unit, lengthConv);
+    }
+
+    if (time !== false && unit in timeConv) {
+        converted = transform(number, unit, timeConv);
+    }
+
+    if (angle !== false && unit in angleConv) {
+        converted = transform(number, unit, angleConv);
+    }
+
+    if (converted && converted.length < value.length) {
+        value = converted;
+    }
+
+    return value;
+};
+
+var lengthConv = {
+    in: 96,
+    px: 1,
+    pt: 4 / 3,
+    pc: 16
+};
+
+var timeConv = {
+    s: 1000,
+    ms: 1
+};
+
+var angleConv = {
+    turn: 360,
+    deg: 1
+};
+
+function dropLeadingZero(number) {
+    var value = String(number);
+
+    if (number % 1) {
+        if (value[0] === '0') {
+            return value.slice(1);
+        }
+
+        if (value[0] === '-' && value[1] === '0') {
+            return '-' + value.slice(2);
+        }
+    }
+
+    return value;
+}
+
+function transform(number, unit, conversion) {
+    var one = void 0,
+        base = void 0;
+    var convertionUnits = Object.keys(conversion).filter(function (u) {
+        if (conversion[u] === 1) {
+            one = u;
+        }
+        return unit !== u;
+    });
+
+    if (unit === one) {
+        base = number / conversion[unit];
+    } else {
+        base = number * conversion[unit];
+    }
+
+    return convertionUnits.map(function (u) {
+        return dropLeadingZero(base / conversion[u]) + u;
+    }).reduce(function (a, b) {
+        return a.length < b.length ? a : b;
+    });
+}
+
+module.exports = exports['default'];
\ No newline at end of file
diff --git a/node_modules/postcss-convert-values/package.json b/node_modules/postcss-convert-values/package.json
new file mode 100644
index 00000000..8c6a2a27
--- /dev/null
+++ b/node_modules/postcss-convert-values/package.json
@@ -0,0 +1,58 @@
+{
+  "name": "postcss-convert-values",
+  "version": "2.6.1",
+  "description": "Convert values with PostCSS (e.g. ms -> s)",
+  "main": "dist/index.js",
+  "files": [
+    "LICENSE-MIT",
+    "dist"
+  ],
+  "scripts": {
+    "contributorAdd": "all-contributors add",
+    "contributorGenerate": "all-contributors generate",
+    "pretest": "eslint src",
+    "prepublish": "del-cli dist && BABEL_ENV=publish babel src --out-dir dist --ignore /__tests__/",
+    "test": "ava",
+    "test-012": "ava"
+  },
+  "keywords": [
+    "css",
+    "optimisation",
+    "postcss",
+    "postcss-plugin"
+  ],
+  "license": "MIT",
+  "devDependencies": {
+    "all-contributors-cli": "^3.0.5",
+    "ava": "^0.17.0",
+    "babel-cli": "^6.3.17",
+    "babel-core": "^6.3.26",
+    "babel-plugin-add-module-exports": "^0.2.1",
+    "babel-preset-es2015": "^6.3.13",
+    "babel-preset-es2015-loose": "^7.0.0",
+    "babel-preset-stage-0": "^6.3.13",
+    "babel-register": "^6.9.0",
+    "del-cli": "^0.2.0",
+    "eslint": "^3.0.0",
+    "eslint-config-cssnano": "^3.0.0",
+    "eslint-plugin-babel": "^3.3.0",
+    "eslint-plugin-import": "^2.0.1"
+  },
+  "homepage": "https://github.com/ben-eb/postcss-convert-values",
+  "author": {
+    "name": "Ben Briggs",
+    "email": "beneb.info@gmail.com",
+    "url": "http://beneb.info"
+  },
+  "repository": "ben-eb/postcss-convert-values",
+  "dependencies": {
+    "postcss": "^5.0.11",
+    "postcss-value-parser": "^3.1.2"
+  },
+  "ava": {
+    "require": "babel-register"
+  },
+  "eslintConfig": {
+    "extends": "cssnano"
+  }
+}