webpack: Disable ModuleConcatenationPlugin

Until a new release of react-loadable is made with the
fix applied inhttps://github.com/jamiebuilds/react-loadable/commit/65abc58456a1bf027b883be78fbe32da9d6a4f53

Author: smspillaz

internals/webpack/webpack.prod.babel.js

@@ -4,7 +4,11 @@ const config = require('./webpack.base.babel');
 
 module.exports = (options) => config({
   plugins: [
-    new webpack.optimize.ModuleConcatenationPlugin(),
+    // We need to disable this until a release
+    // of react-loadable is shipped with:
+    // https://github.com/jamiebuilds/react-loadable/commit/65abc58456a1bf027b883be78fbe32da9d6a4f53
+    //
+    // new webpack.optimize.ModuleConcatenationPlugin(),
     new webpack.optimize.CommonsChunkPlugin({
       name: 'vendor',
       children: true,