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diff --git a/node_modules/postcss-calc/CHANGELOG.md b/node_modules/postcss-calc/CHANGELOG.md
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+# 5.3.1 - 2016-08-22
+
+- Fixed: avoid security issue related to ``reduce-css-calc@< 1.2.4``.
+
+# 5.3.0 - 2016-07-11
+
+- Added: support for selector transformation via `selectors` option.
+  ([#29](https://github.com/postcss/postcss-calc/pull/29) - @uniquegestaltung)
+
+# 5.2.1 - 2016-04-10
+
+- Fixed: support for multiline value
+  ([#27](https://github.com/postcss/postcss-calc/pull/27)) 
+
+# 5.2.0 - 2016-01-08
+
+- Added: "mediaQueries" option for `@media` support
+([#22](https://github.com/postcss/postcss-calc/pull/22))
+
+# 5.1.0 - 2016-01-07
+
+- Added: "warnWhenCannotResolve" option to warn when calc() are not reduced to a single value
+([#20](https://github.com/postcss/postcss-calc/pull/20))
+
+# 5.0.0 - 2015-08-25
+
+- Removed: compatibility with postcss v4.x
+- Added: compatibility with postcss v5.x
+
+# 4.1.0 - 2015-04-09
+
+- Added: compatibility with postcss v4.1.x ([#12](https://github.com/postcss/postcss-calc/pull/12))
+
+# 4.0.1 - 2015-04-09
+
+- Fixed: `preserve` option does not create duplicated values ([#7](https://github.com/postcss/postcss-calc/issues/7))
+
+# 4.0.0 - 2015-01-26
+
+- Added: compatibility with postcss v4.x
+- Changed: partial compatiblity with postcss v3.x (stack traces have lost filename)
+
+# 3.0.0 - 2014-11-24
+
+- Added: GNU like exceptions ([#4](https://github.com/postcss/postcss-calc/issues/4))
+- Added: `precision` option ([#5](https://github.com/postcss/postcss-calc/issues/5))
+- Added: `preserve` option ([#6](https://github.com/postcss/postcss-calc/issues/6))
+
+# 2.1.0 - 2014-10-15
+
+- Added: source of the error (gnu like message) (fix [#3](https://github.com/postcss/postcss-calc/issues/3))
+
+# 2.0.1 - 2014-08-10
+
+- Fixed: correctly ignore unrecognized values (fix [#2](https://github.com/postcss/postcss-calc/issues/2))
+
+# 2.0.0 - 2014-08-06
+
+- Changed: Plugin now return a function to have a consistent api. ([ref 1](https://github.com/ianstormtaylor/rework-color-function/issues/6), [ref 2](https://twitter.com/jongleberry/status/496552790416576513))
+
+# 1.0.0 - 2014-08-04
+
+✨ First release based on [rework-calc](https://github.com/reworkcss/rework-calc) v1.1.0 (code mainly exported to [`reduce-css-calc`](https://github.com/MoOx/reduce-css-calc))
diff --git a/node_modules/postcss-calc/LICENSE b/node_modules/postcss-calc/LICENSE
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+++ b/node_modules/postcss-calc/LICENSE
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+The MIT License (MIT)
+
+Copyright (c) 2014 Maxime Thirouin
+
+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-calc/README.md b/node_modules/postcss-calc/README.md
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+# postcss-calc [![Build Status](https://travis-ci.org/postcss/postcss-calc.png)](https://travis-ci.org/postcss/postcss-calc)
+
+> [PostCSS](https://github.com/postcss/postcss) plugin to reduce `calc()`.
+
+This plugin reduce `calc()` references whenever it's possible.
+This can be particularly useful with the [postcss-custom-properties](https://github.com/postcss/postcss-custom-properties) plugin.
+
+**Note:** When multiple units are mixed together in the same expression, the `calc()` statement is left as is, to fallback to the [w3c calc() feature](http://www.w3.org/TR/css3-values/#calc).
+
+## Installation
+
+```console
+$ npm install postcss-calc
+```
+
+## Usage
+
+```js
+// dependencies
+var fs = require("fs")
+var postcss = require("postcss")
+var calc = require("postcss-calc")
+
+// css to be processed
+var css = fs.readFileSync("input.css", "utf8")
+
+// process css
+var output = postcss()
+  .use(calc())
+  .process(css)
+  .css
+```
+
+**Example** (with [postcss-custom-properties](https://github.com/postcss/postcss-custom-properties) enabled as well):
+
+```js
+// dependencies
+var fs = require("fs")
+var postcss = require("postcss")
+var customProperties = require("postcss-custom-properties")
+var calc = require("postcss-calc")
+
+// css to be processed
+var css = fs.readFileSync("input.css", "utf8")
+
+// process css
+var output = postcss()
+  .use(customProperties())
+  .use(calc())
+  .process(css)
+  .css
+```
+
+Using this `input.css`:
+
+```css
+:root {
+  --main-font-size: 16px;
+}
+
+body {
+  font-size: var(--main-font-size);
+}
+
+h1 {
+  font-size: calc(var(--main-font-size) * 2);
+  height: calc(100px - 2em);
+  margin-bottom: calc(
+      var(--main-font-size)
+      * 1.5
+    )
+}
+```
+
+you will get:
+
+```css
+body {
+  font-size: 16px
+}
+
+h1 {
+  font-size: 32px;
+  height: calc(100px - 2em);
+  margin-bottom: 24px
+}
+```
+
+Checkout [tests](test) for more examples.
+
+### Options
+
+#### `precision` (default: `5`)
+
+Allow you to definine the precision for decimal numbers.
+
+```js
+var out = postcss()
+  .use(calc({precision: 10}))
+  .process(css)
+  .css
+```
+
+#### `preserve` (default: `false`)
+
+Allow you to preserve calc() usage in output so browsers will handle decimal precision themselves.
+
+```js
+var out = postcss()
+  .use(calc({preserve: true}))
+  .process(css)
+  .css
+```
+
+#### `warnWhenCannotResolve` (default: `false`)
+
+Adds warnings when calc() are not reduced to a single value.
+
+```js
+var out = postcss()
+  .use(calc({warnWhenCannotResolve: true}))
+  .process(css)
+  .css
+```
+
+#### `mediaQueries` (default: `false`)
+
+Allows calc() usage as part of media query declarations.
+
+```js
+var out = postcss()
+  .use(calc({mediaQueries: true}))
+  .process(css)
+  .css
+```
+
+#### `selectors` (default: `false`)
+
+Allows calc() usage as part of selectors.
+
+```js
+var out = postcss()
+  .use(calc({selectors: true}))
+  .process(css)
+  .css
+```
+
+Example:
+
+```css
+div[data-size="calc(3*3)"] {
+  width: 100px;
+}
+```
+
+---
+
+## Contributing
+
+Work on a branch, install dev-dependencies, respect coding style & run tests before submitting a bug fix or a feature.
+
+```console
+$ git clone https://github.com/postcss/postcss-calc.git
+$ git checkout -b patch-1
+$ npm install
+$ npm test
+```
+
+## [Changelog](CHANGELOG.md)
+
+## [License](LICENSE)
diff --git a/node_modules/postcss-calc/index.js b/node_modules/postcss-calc/index.js
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+/**
+ * Module dependencies.
+ */
+var reduceCSSCalc = require("reduce-css-calc")
+var helpers = require("postcss-message-helpers")
+var postcss = require("postcss")
+
+var CONTAINS_CALC = /\bcalc\([\s\S]*?\)/
+
+/**
+ * PostCSS plugin to reduce calc() function calls.
+ */
+module.exports = postcss.plugin("postcss-calc", function(options) {
+  options = options || {}
+  var precision = options.precision
+  var preserve = options.preserve
+  var warnWhenCannotResolve = options.warnWhenCannotResolve
+  var mediaQueries = options.mediaQueries
+  var selectors = options.selectors
+
+  return function(style, result) {
+    function transformValue(node, property) {
+      var value = node[property]
+
+      if (!value || !CONTAINS_CALC.test(value)) {
+        return
+      }
+
+      helpers.try(function transformCSSCalc() {
+        var reducedValue = reduceCSSCalc(value, precision)
+
+        if (warnWhenCannotResolve && CONTAINS_CALC.test(reducedValue)) {
+          result.warn("Could not reduce expression: " + value,
+            {plugin: "postcss-calc", node: node})
+        }
+
+        if (!preserve) {
+          node[property] = reducedValue
+          return
+        }
+
+        if (reducedValue != value) {
+          var clone = node.clone()
+          clone[property] = reducedValue
+          node.parent.insertBefore(node, clone)
+        }
+      }, node.source)
+    }
+
+    style.walk(function(rule) {
+      if (mediaQueries && rule.type === "atrule") {
+        return transformValue(rule, "params")
+      }
+      else if (rule.type === "decl") {
+        return transformValue(rule, "value")
+      }
+      else if (selectors && rule.type === "rule") {
+        return transformValue(rule, "selector")
+      }
+    })
+  }
+})
diff --git a/node_modules/postcss-calc/package.json b/node_modules/postcss-calc/package.json
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+{
+  "name": "postcss-calc",
+  "version": "5.3.1",
+  "description": "PostCSS plugin to reduce calc()",
+  "keywords": [
+    "css",
+    "postcss",
+    "postcss-plugin",
+    "calculation",
+    "calc"
+  ],
+  "author": "Maxime Thirouin",
+  "license": "MIT",
+  "repository": "https://github.com/postcss/postcss-calc.git",
+  "files": [
+    "index.js"
+  ],
+  "dependencies": {
+    "postcss-message-helpers": "^2.0.0",
+    "reduce-css-calc": "^1.2.6",
+    "postcss": "^5.0.2"
+  },
+  "devDependencies": {
+    "eslint": "^1.0.0",
+    "npmpub": "^3.1.0",
+    "postcss-custom-properties": "^5.0.0",
+    "tape": "^3.0.0"
+  },
+  "scripts": {
+    "test": "eslint . && tape test",
+    "release": "npmpub"
+  }
+}