ENYO-2306: fix PhoneGap build integration (Windows & OSX)

This is a pretty large refactoring of the PhoneGap integration, so code review is likely to provide less information about stability compared to functional testing.

Tested Ok on OSX/ChromeCanary & Win7/IE10. More testing on more platform welcome.

* ENYO-2306: refactor Phonegap Build integration (Windows integration) (HEAD, enyojs/ENYO-2306.2, ENYO-2306.2)
* ENYO-2306: refactor Phonegap Build integration

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>