[MOSYNC-2819] Android: Made update to Camera handling so that Camera.open(index) is called on API level 9 and above. Camera.open() returns null if the device has no back facing camera, which was the cause of the bug on Nexus 7.
[MOSYNC-2819] Android: Fixed merge conflicts in camera code.
[MOSYNC-2819] Examples: Updated CameraDemo to use a focus listener so that the camera preview is visible when the app is opened after pressing home key on Android. Also updated comments and made the code a bit more clear, improved formatting etc.
Merge pull request #368 from divineprog/ThreeTwoOne

[MOSYNC-2819] Android: Made update to Camera handling so that Camera.ope...