Webpack for production build (#134)

* Webpack config for production build

webpack.prod.js

@@ -0,0 +1,41 @@
+/* global module, __dirname, require */
+const path = require('path');
+const webpack = require('webpack');
+const merge = require('webpack-merge');
+const ExtractTextPlugin = require('extract-text-webpack-plugin');
+
+module.exports = merge.smart(require('./webpack.base.js'), {
+  entry: {
+    cms: [
+      './index',
+    ],
+  },
+  output: {
+    path: path.join(__dirname, 'dist'),
+    filename: '[name].js',
+  },
+  module: {
+    loaders: [
+      {
+        test: /\.scss$/,
+        loader: ExtractTextPlugin.extract('style', 'css?modules!sass'),
+      },
+      {
+        test: /\.css$/,
+        loader: ExtractTextPlugin.extract('style', 'css?modules&importLoaders=1&&localIdentName=cms__[name]__[local]!postcss'),
+      },
+    ],
+  },
+  context: path.join(__dirname, 'src'),
+  plugins: [
+    new webpack.DefinePlugin({
+      'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV)
+    }),
+    new webpack.ProvidePlugin({
+      'fetch': 'imports?this=>global!exports?global.fetch!whatwg-fetch'
+    }),
+    new webpack.optimize.OccurenceOrderPlugin(),
+    new webpack.optimize.UglifyJsPlugin(),
+    new ExtractTextPlugin('[name].css', { allChunks: true }),
+  ],
+});