Update with some new Yeoman prompts and integration with webapp [Marked as experimental initially]

There are minor updates made to the flow to include further platforms and include plugin via plugman from Cordova.

The majority of other changes is in the experimental webapp generator integration, this is a complete deviation from the current grunt file - relying more heavily on cordova CLI for Emulator and Device support, but add some of the new web technologies webapp generator uses (like auto prefixing and livereload)