[RingingActivity] added some logging
[CallActivity] added some logging
[SimlarService] added a comment about TaskStackBuilder
[CallActivity] prevent CallTimer from running more than once
[SimlarServiceCommunicator] register does not start a stopped service anymore
[SimlarService] now has static boolean mRunning
[CallActivity] make sure finish delayed is only called once
[SimlarServiceCommunicator] now unregisters when service finishes
[MainActivity] now starts other activities if service is running
[SimlarService] fixed bug when going down with no connected activity
[SimlarService] make sure we register MainActivity if terminateCall is invoked
[SimlarService] make sure we register RingingActivity before starting it
Merge pull request #142 from simlar/enhance-gui-stability-pullrequest

Enhance GUI stability Pullrequest