Adding webpack code splitting (#3377)

webapp/webpack.config.js

@@ -105,7 +105,13 @@ var config = {
             'process.env': {
                 NODE_ENV: JSON.stringify('production')
             }
+        }),
+        new webpack.optimize.CommonsChunkPlugin({
+            minChunks: 2,
+            children: true,
+            name: 'main'
         })
+        //new webpack.optimize.AggressiveMergingPlugin()
     ],
     resolve: {
         alias: {
@@ -144,9 +150,6 @@ if (!DEV) {
             comments: false
         })
     );
-    config.plugins.push(
-        new webpack.optimize.AggressiveMergingPlugin()
-    );
     config.plugins.push(
         new webpack.optimize.OccurrenceOrderPlugin(true)
     );