CLOUDSRV-2211 Eliminate dependency between Push and device and user registration / CLOUDSRV-2448 update on titanium mobile api doc

CLOUDSRV-2211 Eliminate dependency between Push and device and user registration / CLOUDSRV-2448 update on titanium mobile api doc

ACS API on push notification updates
https://jira.appcelerator.org/browse/CLOUDSRV-2447