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diff --git a/node_modules/postcss-message-helpers/CHANGELOG.md b/node_modules/postcss-message-helpers/CHANGELOG.md
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+# 2.0.0 - 2014-01-26
+
+- Added: compatibility with postcss v4.x
+- Removed: compability with postcss v3.x
+
+# 1.1.1 - 2014-11-24
+
+- Fixed: issue with multilines error message in stack trace
+- Added: `originalMessage` property in the exception
+
+# 1.1.0 - 2014-11-24
+
+- Added: `try` now returns the result of the callback
+
+# 1.0.0 - 2014-11-24
+
+✨ First release 
diff --git a/node_modules/postcss-message-helpers/LICENSE b/node_modules/postcss-message-helpers/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-message-helpers/README.md b/node_modules/postcss-message-helpers/README.md
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+# postcss-message-helpers [![Build Status](https://travis-ci.org/MoOx/postcss-message-helpers.png)](https://travis-ci.org/MoOx/postcss-message-helpers)
+
+> [PostCSS](https://github.com/postcss/postcss) helpers to throw or output GNU style messages.
+
+This modules offers you some function to throw or just output messages with [GNU style](https://www.gnu.org/prep/standards/html_node/Errors.html): `sourcefile:lineno:column: message`
+
+## Installation
+
+```console
+$ npm install postcss-message-helpers
+```
+
+```js
+var messageHelpers = require("postcss-message-helpers")
+```
+
+## Usage
+
+### `var fnValue = messageHelpers.try(fn, source)`
+
+Execute `fn` an return the value.
+If an exception is thrown during the process, the exception will be catched, enhanced from source & re-throw.
+
+### `var sourceMessage = messageHelpers.message(message, source)`
+
+Returns a message like `sourcefile:lineno:column: message`.  
+`source` should be a postcss source object from a node.
+
+### `var source = messageHelpers.source(source)`
+
+Returns `sourcefile:lineno:column` for a given `source` postcss object.
+
+### Example
+
+```js
+// dependencies
+var fs = require("fs")
+var postcss = require("postcss")
+var messageHelpers = require("postcss-message-helpers")
+
+// css to be processed
+var css = fs.readFileSync("input.css", "utf8")
+
+// process css
+var output = postcss()
+  .use(function(styles) {
+    styles.eachDecl(function transformDecl(decl) {
+      // will catch, adjust error stack, line, column & message (gnu style) then re-throw
+      messageHelpers.try(function IwillThrow() {
+        if (decl.value.indexOf("error(") > -1) {
+          throw new Error("error detected: " + decl.value)
+        }
+      }, decl.source)
+
+      // will output a gnu style warning
+      if (decl.value.indexOf("warning(") > -1) {
+        console.warning(messageHelpers.message("warning: " + decl.value, decl.source))
+      }
+    })
+  })
+  .process(css)
+  .css
+```
+
+Checkout [tests](test) for more examples.
+
+---
+
+## Contributing
+
+Work on a branch, install dev-dependencies, respect coding style & run tests before submitting a bug fix or a feature.
+
+    $ git clone https://github.com/MoOx/postcss-message-helpers.git
+    $ git checkout -b patch-1
+    $ npm install
+    $ npm test
+
+## [Changelog](CHANGELOG.md)
+
+## [License](LICENSE)
diff --git a/node_modules/postcss-message-helpers/index.js b/node_modules/postcss-message-helpers/index.js
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+++ b/node_modules/postcss-message-helpers/index.js
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+/**
+ * Constants
+ */
+var SPLITTER = "\n    at "
+
+/**
+ * PostCSS helpers
+ */
+module.exports = {
+  sourceString: sourceString,
+  message: formatMessage,
+  try: tryCatch
+}
+
+/**
+ * Returns GNU style source
+ *
+ * @param {Object} source
+ */
+function sourceString(source) {
+  var message = "<css input>"
+  if (source) {
+    if (source.input && source.input.file) {
+      message = source.input.file
+    }
+    if (source.start) {
+      message += ":" + source.start.line + ":" + source.start.column
+    }
+  }
+
+  return message
+}
+
+/**
+ * Returns a GNU style message
+ *
+ * @param  {String} message
+ * @param  {Object} source a PostCSS source object
+ * @return {String}
+ */
+function formatMessage(message, source) {
+  return sourceString(source) + ": " + message
+}
+
+/**
+ * Do something and throw an error with enhanced exception (from given source)
+ *
+ * @param {Function} fn     [description]
+ * @param {[type]}   source [description]
+ */
+function tryCatch(fn, source) {
+  try {
+    return fn()
+  }
+  catch (err) {
+    err.originalMessage = err.message
+    err.message = formatMessage(err.message, source)
+
+    // if source seems interesting, enhance error
+    if (typeof source === "object") {
+      // add a stack item if something interesting available
+      if ((source.input && source.input.file) || source.start) {
+        var stack = err.stack.split(SPLITTER)
+        var firstStackItem = stack.shift()
+        stack.unshift(sourceString(source))
+        stack.unshift(firstStackItem)
+        err.stack = stack.join(SPLITTER)
+      }
+
+      if (source.input && source.input.file) {
+        err.fileName = source.input.file
+      }
+      if (source.start) {
+        err.lineNumber = source.start.line
+        err.columnNumber = source.start.column
+      }
+    }
+
+    throw err
+  }
+}
diff --git a/node_modules/postcss-message-helpers/package.json b/node_modules/postcss-message-helpers/package.json
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+++ b/node_modules/postcss-message-helpers/package.json
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+{
+  "name": "postcss-message-helpers",
+  "version": "2.0.0",
+  "description": "PostCSS helpers to throw or output GNU style messages",
+  "keywords": [
+    "css",
+    "postcss",
+    "postcss-plugins",
+    "messages",
+    "error",
+    "warning"
+  ],
+  "author": "Maxime Thirouin",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/MoOx/postcss-message-helpers.git"
+  },
+  "files": [
+    "CHANGELOG.md",
+    "LICENSE",
+    "index.js"
+  ],
+  "devDependencies": {
+    "jscs": "^1.6.2",
+    "jshint": "^2.5.6",
+    "postcss": "^4.0.2",
+    "tape": "^3.0.0"
+  },
+  "scripts": {
+    "lint": "jscs *.js **/*.js && jshint . --exclude-path .gitignore",
+    "test": "npm run lint && tape test"
+  }
+}