Added the Webpack '-p' command line parameter for doing production builds.

Author: maratbn

BUILD_INSTRUCTIONS

@@ -67,7 +67,7 @@
 
 (11) Bundle / transpile the JavaScript with Webpack for deployment:
 
-    $ ./node_modules/webpack/bin/webpack.js --config ./webpack.config.js
+    $ ./node_modules/webpack/bin/webpack.js -p --config ./webpack.config.js
 
     ...