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diff --git a/node_modules/webpack-sources/LICENSE b/node_modules/webpack-sources/LICENSE
new file mode 100644
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--- /dev/null
+++ b/node_modules/webpack-sources/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2017 JS Foundation and other contributors
+
+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/webpack-sources/README.md b/node_modules/webpack-sources/README.md
new file mode 100644
index 00000000..4da3c341
--- /dev/null
+++ b/node_modules/webpack-sources/README.md
@@ -0,0 +1,222 @@
+# webpack-sources
+
+Contains multiple classes which represent a `Source`. A `Source` can be asked for source code, size, source map and hash.
+
+## `Source`
+
+Base class for all sources.
+
+### Public methods
+
+All methods should be considered as expensive as they may need to do computations.
+
+#### `source`
+
+``` js
+Source.prototype.source() -> String
+```
+
+Returns the represented source code as string.
+
+#### `size`
+
+``` js
+Source.prototype.size() -> Number
+```
+
+Returns the size in chars of the represented source code.
+
+#### `map`
+
+``` js
+Source.prototype.map(options: Object) -> Object | null
+```
+
+Returns the SourceMap of the represented source code as JSON. May return `null` if no SourceMap is available.
+
+The `options` object can contain the following keys:
+
+* `columns: Boolean` (default `true`): If set to false the implementation may omit mappings for columns.
+* `module: Boolean` (default `true`): If set to false the implementation may omit inner mappings for modules.
+
+#### `sourceAndMap`
+
+``` js
+Source.prototype.sourceAndMap(options: Object) -> {
+	code: String,
+	map: Object
+}
+```
+
+Returns both, source code (like `Source.prototype.source()` and SourceMap (like `Source.prototype.map()`). This method could have better performance than calling `source()` and `map()` separately.
+
+See `map()` for `options`.
+
+#### `updateHash`
+
+``` js
+Source.prototype.updateHash(hash: Hash) -> void
+```
+
+Updates the provided `Hash` object with the content of the represented source code. (`Hash` is an object with an `update` method, which is called with string values)
+
+#### `node` (optional)
+
+``` js
+Source.prototype.node(options: Object) -> SourceNode
+```
+
+This is an optional method. It may be `null` if not implemented.
+
+Returns a `SourceNode` (see source-map library) for the represented source code.
+
+See `map()` for `options`.
+
+#### `listNode` (optional)
+
+``` js
+Source.prototype.listNode(options: Object) -> SourceNode
+```
+
+This is an optional method. It may be `null` if not implemented.
+
+Returns a `SourceListMap` (see source-list-map library) for the represented source code.
+
+See `map()` for `options`.
+
+## `RawSource`
+
+Represents source code without SourceMap.
+
+``` js
+new RawSource(sourceCode: String)
+```
+
+## `OriginalSource`
+
+Represents source code, which is a copy of the original file.
+
+``` js
+new OriginalSource(
+	sourceCode: String,
+	name: String
+)
+```
+
+* `sourceCode`: The source code.
+* `name`: The filename of the original source code.
+
+OriginalSource tries to create column mappings if requested, by splitting the source code at typical statement borders (`;`, `{`, `}`).
+
+## `SourceMapSource`
+
+Represents source code with SourceMap, optionally having an additional SourceMap for the original source.
+
+``` js
+new SourceMapSource(
+	sourceCode: String,
+	name: String,
+	sourceMap: Object | String,
+	originalSource?: String,
+	innerSourceMap?: Object | String
+)
+```
+
+* `sourceCode`: The source code.
+* `name`: The filename of the original source code.
+* `sourceMap`: The SourceMap for the source code.
+* `originalSource`: The source code of the original file. Can be omitted if the `sourceMap` already contains the original source code.
+* `innerSourceMap`: The SourceMap for the `originalSource`/`name`.
+
+## `LineToLineMappedSource`
+
+Represents source code, which is mapped line by line to the original file.
+
+``` js
+new LineToLineMappedSource(
+	sourceCode: String,
+	name: String,
+	originalSource: String
+)
+```
+
+* `sourceCode`: The source code.
+* `name`: The filename of the original source code.
+* `originalSource`: The original source code.
+
+## `CachedSource`
+
+Decorates a `Source` and caches returned results of `map`, `source`, `size` and `sourceAndMap` in memory. Every other operation is delegated to the wrapped `Source`.
+
+``` js
+new CachedSource(source: Source)
+```
+
+## `PrefixSource`
+
+Prefix every line of the decorated `Source` with a provided string.
+
+``` js
+new PrefixSource(
+	prefix: String,
+	source: Source
+)
+```
+
+## `ConcatSource`
+
+Concatenate mulitple `Source`s or strings to a single source.
+
+``` js
+new ConcatSource(
+	...items?: Source | String
+)
+```
+
+### Public methods
+
+#### `add`
+
+``` js
+ConcatSource.prototype.add(item: Source | String)
+```
+
+Adds an item to the source.	
+
+## `ReplaceSource`
+
+Decorates a `Source` with replacements and insertions of source code.
+
+### Public methods
+
+#### `replace`
+
+``` js
+ReplaceSource.prototype.replace(
+	start: Number,
+	end: Number,
+	replacement: String
+)
+```
+
+Replaces chars from `start` (0-indexed, inclusive) to `end` (0-indexed, inclusive) with `replacement`.
+
+Locations represents locations in the original source and are not influenced by other replacements or insertions.
+
+#### `insert`
+
+``` js
+ReplaceSource.prototype.insert(
+	pos: Number,
+	insertion: String
+)
+```
+
+Inserts the `insertion` before char `pos` (0-indexed).
+
+Location represents location in the original source and is not influenced by other replacements or insertions.
+
+#### `original`
+
+Get decorated `Source`.
+
diff --git a/node_modules/webpack-sources/lib/CachedSource.js b/node_modules/webpack-sources/lib/CachedSource.js
new file mode 100644
index 00000000..940c4d9f
--- /dev/null
+++ b/node_modules/webpack-sources/lib/CachedSource.js
@@ -0,0 +1,78 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+const Source = require("./Source");
+
+class CachedSource extends Source {
+	constructor(source) {
+		super();
+		this._source = source;
+		this._cachedSource = undefined;
+		this._cachedSize = undefined;
+		this._cachedMaps = {};
+
+		if(source.node) this.node = function(options) {
+			return this._source.node(options);
+		};
+
+		if(source.listMap) this.listMap = function(options) {
+			return this._source.listMap(options);
+		};
+	}
+
+	source() {
+		if(typeof this._cachedSource !== "undefined") return this._cachedSource;
+		return this._cachedSource = this._source.source();
+	}
+
+	size() {
+		if(typeof this._cachedSize !== "undefined") return this._cachedSize;
+		if(typeof this._cachedSource !== "undefined")
+			return this._cachedSize = this._cachedSource.length;
+		return this._cachedSize = this._source.size();
+	}
+
+	sourceAndMap(options) {
+		const key = JSON.stringify(options);
+		if(typeof this._cachedSource !== "undefined" && key in this._cachedMaps)
+			return {
+				source: this._cachedSource,
+				map: this._cachedMaps[key]
+			};
+		else if(typeof this._cachedSource !== "undefined") {
+			return {
+				source: this._cachedSource,
+				map: this._cachedMaps[key] = this._source.map(options)
+			};
+		} else if(key in this._cachedMaps) {
+			return {
+				source: this._cachedSource = this._source.source(),
+				map: this._cachedMaps[key]
+			};
+		}
+		const result = this._source.sourceAndMap(options);
+		this._cachedSource = result.source;
+		this._cachedMaps[key] = result.map;
+		return {
+			source: this._cachedSource,
+			map: this._cachedMaps[key]
+		};
+	}
+
+	map(options) {
+		if(!options) options = {};
+		const key = JSON.stringify(options);
+		if(key in this._cachedMaps)
+			return this._cachedMaps[key];
+		return this._cachedMaps[key] = this._source.map();
+	}
+
+	updateHash(hash) {
+		this._source.updateHash(hash);
+	}
+}
+
+module.exports = CachedSource;
diff --git a/node_modules/webpack-sources/lib/ConcatSource.js b/node_modules/webpack-sources/lib/ConcatSource.js
new file mode 100644
index 00000000..25167d6e
--- /dev/null
+++ b/node_modules/webpack-sources/lib/ConcatSource.js
@@ -0,0 +1,91 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+const SourceNode = require("source-map").SourceNode;
+const SourceListMap = require("source-list-map").SourceListMap;
+const Source = require("./Source");
+
+class ConcatSource extends Source {
+	constructor() {
+		super();
+		this.children = [];
+		for(var i = 0; i < arguments.length; i++) {
+			var item = arguments[i];
+			if(item instanceof ConcatSource) {
+				var children = item.children;
+				for(var j = 0; j < children.length; j++)
+					this.children.push(children[j]);
+			} else {
+				this.children.push(item);
+			}
+		}
+	}
+
+	add(item) {
+		if(item instanceof ConcatSource) {
+			var children = item.children;
+			for(var j = 0; j < children.length; j++)
+				this.children.push(children[j]);
+		} else {
+			this.children.push(item);
+		}
+	}
+
+	source() {
+		let source = "";
+		const children = this.children;
+		for(let i = 0; i < children.length; i++) {
+			const child = children[i];
+			source += typeof child === "string" ? child : child.source();
+		}
+		return source;
+	}
+
+	size() {
+		let size = 0;
+		const children = this.children;
+		for(let i = 0; i < children.length; i++) {
+			const child = children[i];
+			size += typeof child === "string" ? child.length : child.size();
+		}
+		return size;
+	}
+
+	node(options) {
+		const node = new SourceNode(null, null, null, this.children.map(function(item) {
+			return typeof item === "string" ? item : item.node(options);
+		}));
+		return node;
+	}
+
+	listMap(options) {
+		const map = new SourceListMap();
+		var children = this.children;
+		for(var i = 0; i < children.length; i++) {
+			var item = children[i];
+			if(typeof item === "string")
+				map.add(item);
+			else
+				map.add(item.listMap(options));
+		}
+		return map;
+	}
+
+	updateHash(hash) {
+		var children = this.children;
+		for(var i = 0; i < children.length; i++) {
+			var item = children[i];
+			if(typeof item === "string")
+				hash.update(item);
+			else
+				item.updateHash(hash);
+		}
+	}
+}
+
+require("./SourceAndMapMixin")(ConcatSource.prototype);
+
+module.exports = ConcatSource;
diff --git a/node_modules/webpack-sources/lib/LineToLineMappedSource.js b/node_modules/webpack-sources/lib/LineToLineMappedSource.js
new file mode 100644
index 00000000..a1a17bb4
--- /dev/null
+++ b/node_modules/webpack-sources/lib/LineToLineMappedSource.js
@@ -0,0 +1,49 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+var SourceNode = require("source-map").SourceNode;
+var SourceMapConsumer = require("source-map").SourceMapConsumer;
+var SourceListMap = require("source-list-map").SourceListMap;
+var Source = require("./Source");
+
+class LineToLineMappedSource extends Source {
+	constructor(value, name, originalSource) {
+		super();
+		this._value = value;
+		this._name = name;
+		this._originalSource = originalSource;
+	}
+
+	source() {
+		return this._value;
+	}
+
+	node(options) {
+		var value = this._value;
+		var name = this._name;
+		var lines = value.split("\n");
+		var node = new SourceNode(null, null, null,
+			lines.map(function(line, idx) {
+				return new SourceNode(idx + 1, 0, name, (line + (idx != lines.length - 1 ? "\n" : "")));
+			})
+		);
+		node.setSourceContent(name, this._originalSource);
+		return node;
+	}
+
+	listMap(options) {
+		return new SourceListMap(this._value, this._name, this._originalSource)
+	}
+
+	updateHash(hash) {
+		hash.update(this._value);
+		hash.update(this._originalSource);
+	}
+}
+
+require("./SourceAndMapMixin")(LineToLineMappedSource.prototype);
+
+module.exports = LineToLineMappedSource;
diff --git a/node_modules/webpack-sources/lib/OriginalSource.js b/node_modules/webpack-sources/lib/OriginalSource.js
new file mode 100644
index 00000000..f3b52273
--- /dev/null
+++ b/node_modules/webpack-sources/lib/OriginalSource.js
@@ -0,0 +1,70 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+var SourceNode = require("source-map").SourceNode;
+var SourceMapConsumer = require("source-map").SourceMapConsumer;
+var SourceListMap = require("source-list-map").SourceListMap;
+var Source = require("./Source");
+
+var SPLIT_REGEX = /(?!$)[^\n\r;{}]*[\n\r;{}]*/g;
+
+function _splitCode(code) {
+	return code.match(SPLIT_REGEX) || [];
+}
+
+class OriginalSource extends Source {
+	constructor(value, name) {
+		super();
+		this._value = value;
+		this._name = name;
+	}
+
+	source() {
+		return this._value;
+	}
+
+	node(options) {
+		options = options || {};
+		var sourceMap = this._sourceMap;
+		var value = this._value;
+		var name = this._name;
+		var lines = value.split("\n");
+		var node = new SourceNode(null, null, null,
+			lines.map(function(line, idx) {
+				var pos = 0;
+				if(options.columns === false) {
+					var content = line + (idx != lines.length - 1 ? "\n" : "");
+					return new SourceNode(idx + 1, 0, name, content);
+				}
+				return new SourceNode(null, null, null,
+					_splitCode(line + (idx != lines.length - 1 ? "\n" : "")).map(function(item) {
+						if(/^\s*$/.test(item)) {
+							pos += item.length;
+							return item;
+						}
+						var res = new SourceNode(idx + 1, pos, name, item);
+						pos += item.length;
+						return res;
+					})
+				);
+			})
+		);
+		node.setSourceContent(name, value);
+		return node;
+	}
+
+	listMap(options) {
+		return new SourceListMap(this._value, this._name, this._value)
+	}
+
+	updateHash(hash) {
+		hash.update(this._value);
+	}
+}
+
+require("./SourceAndMapMixin")(OriginalSource.prototype);
+
+module.exports = OriginalSource;
diff --git a/node_modules/webpack-sources/lib/PrefixSource.js b/node_modules/webpack-sources/lib/PrefixSource.js
new file mode 100644
index 00000000..972e45f9
--- /dev/null
+++ b/node_modules/webpack-sources/lib/PrefixSource.js
@@ -0,0 +1,76 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+var Source = require("./Source");
+var SourceNode = require("source-map").SourceNode;
+
+var REPLACE_REGEX = /\n(?=.|\s)/g;
+
+function cloneAndPrefix(node, prefix, append) {
+	if(typeof node === "string") {
+		var result = node.replace(REPLACE_REGEX, "\n" + prefix);
+		if(append.length > 0) result = append.pop() + result;
+		if(/\n$/.test(node)) append.push(prefix);
+		return result;
+	} else {
+		var newNode = new SourceNode(
+			node.line,
+			node.column,
+			node.source,
+			node.children.map(function(node) {
+				return cloneAndPrefix(node, prefix, append);
+			}),
+			node.name
+		);
+		newNode.sourceContents = node.sourceContents;
+		return newNode;
+	}
+};
+
+class PrefixSource extends Source {
+	constructor(prefix, source) {
+		super();
+		this._source = source;
+		this._prefix = prefix;
+	}
+
+	source() {
+		var node = typeof this._source === "string" ? this._source : this._source.source();
+		var prefix = this._prefix;
+		return prefix + node.replace(REPLACE_REGEX, "\n" + prefix);
+	}
+
+	node(options) {
+		var node = this._source.node(options);
+		var append = [this._prefix];
+		return new SourceNode(null, null, null, [
+			cloneAndPrefix(node, this._prefix, append)
+		]);
+	}
+
+	listMap(options) {
+		var prefix = this._prefix;
+		var map = this._source.listMap(options);
+		return map.mapGeneratedCode(function(code) {
+			return prefix + code.replace(REPLACE_REGEX, "\n" + prefix);
+		});
+	}
+
+	updateHash(hash) {
+		if(typeof this._source === "string")
+			hash.update(this._source);
+		else
+			this._source.updateHash(hash);
+		if(typeof this._prefix === "string")
+			hash.update(this._prefix);
+		else
+			this._prefix.updateHash(hash);
+	}
+}
+
+require("./SourceAndMapMixin")(PrefixSource.prototype);
+
+module.exports = PrefixSource;
diff --git a/node_modules/webpack-sources/lib/RawSource.js b/node_modules/webpack-sources/lib/RawSource.js
new file mode 100644
index 00000000..c09b1cd9
--- /dev/null
+++ b/node_modules/webpack-sources/lib/RawSource.js
@@ -0,0 +1,38 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+var Source = require("./Source");
+var SourceNode = require("source-map").SourceNode;
+var SourceListMap = require("source-list-map").SourceListMap;
+
+class RawSource extends Source {
+	constructor(value) {
+		super();
+		this._value = value;
+	}
+
+	source() {
+		return this._value;
+	}
+
+	map(options) {
+		return null;
+	}
+
+	node(options) {
+		return new SourceNode(null, null, null, this._value);
+	}
+
+	listMap(options) {
+		return new SourceListMap(this._value);
+	}
+
+	updateHash(hash) {
+		hash.update(this._value);
+	}
+}
+
+module.exports = RawSource;
diff --git a/node_modules/webpack-sources/lib/ReplaceSource.js b/node_modules/webpack-sources/lib/ReplaceSource.js
new file mode 100644
index 00000000..f2f781f7
--- /dev/null
+++ b/node_modules/webpack-sources/lib/ReplaceSource.js
@@ -0,0 +1,333 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+var Source = require("./Source");
+var SourceNode = require("source-map").SourceNode;
+var SourceListMap = require("source-list-map").SourceListMap;
+var fromStringWithSourceMap = require("source-list-map").fromStringWithSourceMap;
+var SourceMapConsumer = require("source-map").SourceMapConsumer;
+
+class Replacement {
+	constructor(start, end, content, insertIndex, name) {
+		this.start = start;
+		this.end = end;
+		this.content = content;
+		this.insertIndex = insertIndex;
+		this.name = name;
+	}
+}
+
+class ReplaceSource extends Source {
+	constructor(source, name) {
+		super();
+		this._source = source;
+		this._name = name;
+		/** @type {Replacement[]} */
+		this.replacements = [];
+	}
+
+	replace(start, end, newValue, name) {
+		if(typeof newValue !== "string")
+			throw new Error("insertion must be a string, but is a " + typeof newValue);
+		this.replacements.push(new Replacement(start, end, newValue, this.replacements.length, name));
+	}
+
+	insert(pos, newValue, name) {
+		if(typeof newValue !== "string")
+			throw new Error("insertion must be a string, but is a " + typeof newValue + ": " + newValue);
+		this.replacements.push(new Replacement(pos, pos - 1, newValue, this.replacements.length, name));
+	}
+
+	source(options) {
+		return this._replaceString(this._source.source());
+	}
+
+	original() {
+		return this._source;
+	}
+
+	_sortReplacements() {
+		this.replacements.sort(function(a, b) {
+			var diff = b.end - a.end;
+			if(diff !== 0)
+				return diff;
+			diff = b.start - a.start;
+			if(diff !== 0)
+				return diff;
+			return b.insertIndex - a.insertIndex;
+		});
+	}
+
+	_replaceString(str) {
+		if(typeof str !== "string")
+			throw new Error("str must be a string, but is a " + typeof str + ": " + str);
+		this._sortReplacements();
+		var result = [str];
+		this.replacements.forEach(function(repl) {
+			var remSource = result.pop();
+			var splitted1 = this._splitString(remSource, Math.floor(repl.end + 1));
+			var splitted2 = this._splitString(splitted1[0], Math.floor(repl.start));
+			result.push(splitted1[1], repl.content, splitted2[0]);
+		}, this);
+
+		// write out result array in reverse order
+		let resultStr = "";
+		for(let i = result.length - 1; i >= 0; --i) {
+			resultStr += result[i];
+		}
+		return resultStr;
+	}
+
+	node(options) {
+		var node = this._source.node(options);
+		if(this.replacements.length === 0) {
+			return node;
+		}
+		this._sortReplacements();
+		var replace = new ReplacementEnumerator(this.replacements);
+		var output = [];
+		var position = 0;
+		var sources = Object.create(null);
+		var sourcesInLines = Object.create(null);
+
+		// We build a new list of SourceNodes in "output"
+		// from the original mapping data
+
+		var result = new SourceNode();
+
+		// We need to add source contents manually
+		// because "walk" will not handle it
+		node.walkSourceContents(function(sourceFile, sourceContent) {
+			result.setSourceContent(sourceFile, sourceContent);
+			sources["$" + sourceFile] = sourceContent;
+		});
+
+		var replaceInStringNode = this._replaceInStringNode.bind(this, output, replace, function getOriginalSource(mapping) {
+			var key = "$" + mapping.source;
+			var lines = sourcesInLines[key];
+			if(!lines) {
+				var source = sources[key];
+				if(!source) return null;
+				lines = source.split("\n").map(function(line) {
+					return line + "\n";
+				});
+				sourcesInLines[key] = lines;
+			}
+			// line is 1-based
+			if(mapping.line > lines.length) return null;
+			var line = lines[mapping.line - 1];
+			return line.substr(mapping.column);
+		});
+
+		node.walk(function(chunk, mapping) {
+			position = replaceInStringNode(chunk, position, mapping);
+		});
+
+		// If any replacements occur after the end of the original file, then we append them
+		// directly to the end of the output
+		var remaining = replace.footer();
+		if(remaining) {
+			output.push(remaining);
+		}
+
+		result.add(output);
+
+		return result;
+	}
+
+	listMap(options) {
+		this._sortReplacements();
+		var map = this._source.listMap(options);
+		var currentIndex = 0;
+		var replacements = this.replacements;
+		var idxReplacement = replacements.length - 1;
+		var removeChars = 0;
+		map = map.mapGeneratedCode(function(str) {
+			var newCurrentIndex = currentIndex + str.length;
+			if(removeChars > str.length) {
+				removeChars -= str.length;
+				str = "";
+			} else {
+				if(removeChars > 0) {
+					str = str.substr(removeChars);
+					currentIndex += removeChars;
+					removeChars = 0;
+				}
+				var finalStr = "";
+				while(idxReplacement >= 0 && replacements[idxReplacement].start < newCurrentIndex) {
+					var repl = replacements[idxReplacement];
+					var start = Math.floor(repl.start);
+					var end = Math.floor(repl.end + 1);
+					var before = str.substr(0, Math.max(0, start - currentIndex));
+					if(end <= newCurrentIndex) {
+						var after = str.substr(Math.max(0, end - currentIndex));
+						finalStr += before + repl.content;
+						str = after;
+						currentIndex = Math.max(currentIndex, end);
+					} else {
+						finalStr += before + repl.content;
+						str = "";
+						removeChars = end - newCurrentIndex;
+					}
+					idxReplacement--;
+				}
+				str = finalStr + str;
+			}
+			currentIndex = newCurrentIndex;
+			return str;
+		});
+		var extraCode = "";
+		while(idxReplacement >= 0) {
+			extraCode += replacements[idxReplacement].content;
+			idxReplacement--;
+		}
+		if(extraCode) {
+			map.add(extraCode);
+		}
+		return map;
+	}
+
+	_splitString(str, position) {
+		return position <= 0 ? ["", str] : [str.substr(0, position), str.substr(position)];
+	}
+
+	_replaceInStringNode(output, replace, getOriginalSource, node, position, mapping) {
+		var original = undefined;
+
+		do {
+			var splitPosition = replace.position - position;
+			// If multiple replaces occur in the same location then the splitPosition may be
+			// before the current position for the subsequent splits. Ensure it is >= 0
+			if(splitPosition < 0) {
+				splitPosition = 0;
+			}
+			if(splitPosition >= node.length || replace.done) {
+				if(replace.emit) {
+					var nodeEnd = new SourceNode(
+						mapping.line,
+						mapping.column,
+						mapping.source,
+						node,
+						mapping.name
+					);
+					output.push(nodeEnd);
+				}
+				return position + node.length;
+			}
+
+			var originalColumn = mapping.column;
+
+			// Try to figure out if generated code matches original code of this segement
+			// If this is the case we assume that it's allowed to move mapping.column
+			// Because getOriginalSource can be expensive we only do it when neccessary
+
+			var nodePart;
+			if(splitPosition > 0) {
+				nodePart = node.slice(0, splitPosition);
+				if(original === undefined) {
+					original = getOriginalSource(mapping);
+				}
+				if(original && original.length >= splitPosition && original.startsWith(nodePart)) {
+					mapping.column += splitPosition;
+					original = original.substr(splitPosition);
+				}
+			}
+
+			var emit = replace.next();
+			if(!emit) {
+				// Stop emitting when we have found the beginning of the string to replace.
+				// Emit the part of the string before splitPosition
+				if(splitPosition > 0) {
+					var nodeStart = new SourceNode(
+						mapping.line,
+						originalColumn,
+						mapping.source,
+						nodePart,
+						mapping.name
+					);
+					output.push(nodeStart);
+				}
+
+				// Emit the replacement value
+				if(replace.value) {
+					output.push(new SourceNode(
+						mapping.line,
+						mapping.column,
+						mapping.source,
+						replace.value,
+						mapping.name || replace.name
+					));
+				}
+			}
+
+			// Recurse with remainder of the string as there may be multiple replaces within a single node
+			node = node.substr(splitPosition);
+			position += splitPosition;
+		} while (true);
+	}
+}
+
+class ReplacementEnumerator {
+	/**
+	 * @param {Replacement[]} replacements list of replacements
+	 */
+	constructor(replacements) {
+		this.replacements = replacements || [];
+		this.index = this.replacements.length;
+		this.done = false;
+		this.emit = false;
+		// Set initial start position
+		this.next();
+	}
+
+	next() {
+		if(this.done)
+			return true;
+		if(this.emit) {
+			// Start point found. stop emitting. set position to find end
+			var repl = this.replacements[this.index];
+			var end = Math.floor(repl.end + 1);
+			this.position = end;
+			this.value = repl.content;
+			this.name = repl.name;
+		} else {
+			// End point found. start emitting. set position to find next start
+			this.index--;
+			if(this.index < 0) {
+				this.done = true;
+			} else {
+				var nextRepl = this.replacements[this.index];
+				var start = Math.floor(nextRepl.start);
+				this.position = start;
+			}
+		}
+		if(this.position < 0)
+			this.position = 0;
+		this.emit = !this.emit;
+		return this.emit;
+	}
+
+	footer() {
+		if(!this.done && !this.emit)
+			this.next(); // If we finished _replaceInNode mid emit we advance to next entry
+		if(this.done) {
+			return [];
+		} else {
+			var resultStr = "";
+			for(var i = this.index; i >= 0; i--) {
+				var repl = this.replacements[i];
+				// this doesn't need to handle repl.name, because in SourceMaps generated code
+				// without pointer to original source can't have a name
+				resultStr += repl.content;
+			}
+			return resultStr;
+		}
+	}
+}
+
+require("./SourceAndMapMixin")(ReplaceSource.prototype);
+
+module.exports = ReplaceSource;
diff --git a/node_modules/webpack-sources/lib/Source.js b/node_modules/webpack-sources/lib/Source.js
new file mode 100644
index 00000000..dccf7378
--- /dev/null
+++ b/node_modules/webpack-sources/lib/Source.js
@@ -0,0 +1,45 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+var SourceNode = require("source-map").SourceNode;
+var SourceMapConsumer = require("source-map").SourceMapConsumer;
+
+class Source {
+
+	source() {
+		throw new Error("Abstract");
+	}
+
+	size() {
+		return this.source().length;
+	}
+
+	map(options) {
+		return null;
+	}
+
+	sourceAndMap(options) {
+		return {
+			source: this.source(),
+			map: this.map()
+		};
+	}
+
+	node() {
+		throw new Error("Abstract");
+	}
+
+	listNode() {
+		throw new Error("Abstract");
+	}
+
+	updateHash(hash) {
+		var source = this.source();
+		hash.update(source || "");
+	}
+}
+
+module.exports = Source;
diff --git a/node_modules/webpack-sources/lib/SourceAndMapMixin.js b/node_modules/webpack-sources/lib/SourceAndMapMixin.js
new file mode 100644
index 00000000..d0898274
--- /dev/null
+++ b/node_modules/webpack-sources/lib/SourceAndMapMixin.js
@@ -0,0 +1,38 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+module.exports = function mixinSourceAndMap(proto) {
+	proto.map = function(options) {
+		options = options || {};
+		if(options.columns === false) {
+			return this.listMap(options).toStringWithSourceMap({
+				file: "x"
+			}).map;
+		}
+
+		return this.node(options).toStringWithSourceMap({
+			file: "x"
+		}).map.toJSON();
+	};
+
+	proto.sourceAndMap = function(options) {
+		options = options || {};
+		if(options.columns === false) {
+			//console.log(this.listMap(options).debugInfo());
+			return this.listMap(options).toStringWithSourceMap({
+				file: "x"
+			});
+		}
+
+		var res = this.node(options).toStringWithSourceMap({
+			file: "x"
+		});
+		return {
+			source: res.code,
+			map: res.map.toJSON()
+		};
+	};
+}
diff --git a/node_modules/webpack-sources/lib/SourceMapSource.js b/node_modules/webpack-sources/lib/SourceMapSource.js
new file mode 100644
index 00000000..d61bda15
--- /dev/null
+++ b/node_modules/webpack-sources/lib/SourceMapSource.js
@@ -0,0 +1,58 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+var SourceNode = require("source-map").SourceNode;
+var SourceMapConsumer = require("source-map").SourceMapConsumer;
+var SourceMapGenerator = require("source-map").SourceMapGenerator;
+var SourceListMap = require("source-list-map").SourceListMap;
+var fromStringWithSourceMap = require("source-list-map").fromStringWithSourceMap;
+var Source = require("./Source");
+
+class SourceMapSource extends Source {
+	constructor(value, name, sourceMap, originalSource, innerSourceMap) {
+		super();
+		this._value = value;
+		this._name = name;
+		this._sourceMap = sourceMap;
+		this._originalSource = originalSource;
+		this._innerSourceMap = innerSourceMap;
+	}
+
+	source() {
+		return this._value;
+	}
+
+	node(options) {
+		var innerSourceMap = this._innerSourceMap;
+		var sourceMap = this._sourceMap;
+		if(innerSourceMap) {
+			sourceMap = SourceMapGenerator.fromSourceMap(new SourceMapConsumer(sourceMap));
+			if(this._originalSource)
+				sourceMap.setSourceContent(this._name, this._originalSource);
+			innerSourceMap = new SourceMapConsumer(innerSourceMap);
+			sourceMap.applySourceMap(innerSourceMap, this._name);
+			sourceMap = sourceMap.toJSON();
+		}
+		return SourceNode.fromStringWithSourceMap(this._value, new SourceMapConsumer(sourceMap));
+	}
+
+	listMap(options) {
+		options = options || {};
+		if(options.module === false)
+			return new SourceListMap(this._value, this._name, this._value);
+		return fromStringWithSourceMap(this._value, typeof this._sourceMap === "string" ? JSON.parse(this._sourceMap) : this._sourceMap);
+	}
+
+	updateHash(hash) {
+		hash.update(this._value);
+		if(this._originalSource)
+			hash.update(this._originalSource);
+	}
+}
+
+require("./SourceAndMapMixin")(SourceMapSource.prototype);
+
+module.exports = SourceMapSource;
diff --git a/node_modules/webpack-sources/lib/index.js b/node_modules/webpack-sources/lib/index.js
new file mode 100644
index 00000000..f404c29d
--- /dev/null
+++ b/node_modules/webpack-sources/lib/index.js
@@ -0,0 +1,15 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+exports.Source = require("./Source");
+
+exports.RawSource = require("./RawSource");
+exports.OriginalSource = require("./OriginalSource");
+exports.SourceMapSource = require("./SourceMapSource");
+exports.LineToLineMappedSource = require("./LineToLineMappedSource");
+
+exports.CachedSource = require("./CachedSource");
+exports.ConcatSource = require("./ConcatSource");
+exports.ReplaceSource = require("./ReplaceSource");
+exports.PrefixSource = require("./PrefixSource");
diff --git a/node_modules/webpack-sources/package.json b/node_modules/webpack-sources/package.json
new file mode 100644
index 00000000..a5bc1b0f
--- /dev/null
+++ b/node_modules/webpack-sources/package.json
@@ -0,0 +1,50 @@
+{
+  "name": "webpack-sources",
+  "version": "1.3.0",
+  "description": "Source code handling classes for webpack",
+  "main": "./lib/index.js",
+  "scripts": {
+    "pretest": "npm run lint && npm run beautify-lint",
+    "test": "mocha --full-trace --check-leaks",
+    "travis": "npm run cover -- --report lcovonly",
+    "lint": "eslint lib test",
+    "beautify-lint": "beautify-lint lib/**.js test/**.js",
+    "beautify": "beautify-rewrite lib/**.js test/**.js",
+    "precover": "npm run lint && npm run beautify-lint",
+    "cover": "istanbul cover node_modules/mocha/bin/_mocha",
+    "publish-patch": "npm test && npm version patch && git push && git push --tags && npm publish"
+  },
+  "dependencies": {
+    "source-list-map": "^2.0.0",
+    "source-map": "~0.6.1"
+  },
+  "devDependencies": {
+    "beautify-lint": "^1.0.3",
+    "codecov.io": "^0.1.6",
+    "coveralls": "^2.11.6",
+    "eslint": "^3.19.0",
+    "eslint-plugin-nodeca": "^1.0.3",
+    "istanbul": "^0.4.1",
+    "js-beautify": "^1.5.10",
+    "mocha": "^3.4.2",
+    "should": "^11.2.1",
+    "sourcemap-validator": "^1.1.0"
+  },
+  "files": [
+    "lib/"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/webpack/webpack-sources.git"
+  },
+  "keywords": [
+    "webpack",
+    "source-map"
+  ],
+  "author": "Tobias Koppers @sokra",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/webpack/webpack-sources/issues"
+  },
+  "homepage": "https://github.com/webpack/webpack-sources#readme"
+}