Android camera fixes for Android 2.x.
Merge branch 'ThreeTwoOne' of https://github.com/MoSync/MoSync into ThreeTwoOne
[Camera] numberOfCameras cleaned on Android.
Merge pull request #369 from florinleu/ThreeTwoOne

Three two one
[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.