answer button animation, setting bugfix, background image select feature
Merge branch 'voice' of https://github.com/iamroger/voip into voice
incoming tone
ring tone incoming, confirm, hungup
Merge branch 'voice' of https://github.com/iamroger/voip into voice

Conflicts:
	voice/src/org/roger/android/core/core.java
Merge branch 'card' of https://github.com/iamroger/voip into voice
merge
jni unit
incoming call, invoke start activity and will result in detach thread error
I change invoke method to send message
Merge branch 'voice' of https://github.com/iamroger/voip into card