ENYO-2306: fix PhoneGap build integration (incl. w/ proxies)

Tested on ChromeCanary/OSX & IE10/Win7.

CAVEAT: the build process is broken to long file names on Win7: building a simple index.html works, but not a full Enyo/Bootplate debug tree. This is to be handled as a separated issue .

* ENYO-2306: make PhoneGap work behind corporate HTTP proxies
* ENYO-2306: switch bdPhoneGap to npmlog
* ENYO-2306, ENYO-2307: PhoneGap restore  `/op/build` globally
* ENYO-2306: PhoneGap restore  `/op/build` for unsigned applications
* ENYO-2306: bdPhoneGap: re-implement getToken() & getUserData()
* ENYO-2306: replace `phonegapbuildapi` by `phonegap-build-api` (2/2)
* ENYO-2306: replace `phonegapbuildapi` by `phonegap-build-api`

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>