Enyo 2403: UI for "Phonegap build"

Enyo-2403:
A UI widgets are added in the pannel "Phonegap build" to let the user choose all the parameters for the file "config.xml" used  to build the native applications for serveral plateform (Android, IOS, Black Berry, ...).

In this pull request, the file config.xml isn't genereted yet from the "Phonegap build" pannel.

The UI should be improved to fit well in the "Project -> Edit" pop-up.

Tested on the following web browsers:  Chrome, Firefox,  Safari & Internet Explorer
OS : Windows 7 Entreprise

Ready to be merged.

Enyo-DCO-1.1-Signed-off-by: Rafik Adiche mahmoud-rafik.adiche@hp.com