Allow registration to be started from service

This will allow us to integrate WhisperPush registration with the
CMAccount setup wizard.

Change-Id: I6e974aa08b439c769411a6a8f6112eda9ab087bf
Notify user of new incoming sessions

Change-Id: I8a2162b22b62910a096593beba5c7d7b8721c4cd
Merge "Allow registration to be started from service" into cm-11.0
Merge "Notify user of new incoming sessions" into cm-11.0