Added webpack build config

webpack.prod.config.js

@@ -0,0 +1,18 @@
+var webpack = require('webpack');
+var config = require('./webpack.base.config');
+
+config.plugins = (config.plugins || []).concat([
+  new webpack.DefinePlugin({
+    'process.env': {
+      NODE_ENV: '"production"'
+    }
+  }),
+  new webpack.optimize.UglifyJsPlugin({
+    compress: {
+      warnings: false
+    }
+  }),
+  new webpack.optimize.OccurenceOrderPlugin()
+]);
+
+module.exports = config;