[GcmBroadcastReceiver] added GPL header
[CreateAccountActivity] Code Cleanup: INTENT_EXTRA
[CreateAccount] Code Cleanup: placeholder naming
[PreferencesHelper] Code Cleanup: changed function to private
[GooglePlayServicesHelper] Code Cleanup: added a comment
[LinphoneThread] Code Cleanup
Merge pull request #120 from simlar/codecleanup-again1-pullrequest1

Another Codecleanup Pullrequest