remove dead CommonsChunkPlugin config

Author: davidsbailey

apps/Gruntfile.js

@@ -648,27 +648,6 @@ describe('entry tests', () => {
             }
           }
         }
-
-        // new webpack.optimize.CommonsChunkPlugin({
-        //   name: 'common',
-        //   chunks: _.keys(appsEntries),
-        //   minChunks: 2
-        // }),
-        // new webpack.optimize.CommonsChunkPlugin({
-        //   name: 'code-studio-common',
-        //   chunks: _.keys(codeStudioEntries).concat(['common']),
-        //   minChunks: 2
-        // }),
-        // new webpack.optimize.CommonsChunkPlugin({
-        //   name: 'essential',
-        //   minChunks: 2,
-        //   chunks: [
-        //     'peer_reviews',
-        //     'plc',
-        //     'pd',
-        //     'code-studio-common',
-        //   ]
-        // }),
       },
       plugins: [
         ...(process.env.ANALYZE_BUNDLE ? [