ENYO-2821: The AppId input in"Phonegap build UI" should be replaced by a picker.

The appid is now selected from the panel "Edit -> Phonegap build" using a picker.
This picker contains all the appid of a phonegap user account, when an appid is selected the title of the application is also displayed in the right side label.

Ready for merge

Tested on Chrome (Windows 7)
Enyo-DCO-1.1-Signed-off-by: Rafik Adiche mahmoud-rafik.adiche@hp.com