Bug fixes.

  - FIXED: Record a message | Hit home | App not in task manager - see
doc/task_manager_bug.txt
  - FIXED: Our app is frequently removed from the task manager. It was
being removed due to finish() when an intent that should not put us in
the foreground was handled when we were not in the foreground. see
doc/task_manager_bug
  - FIXED: Error messages during release of mediaRecorder and camera -
I get in the log: E/BufferQueue(181): [SurfaceView] queueBuffer:
BufferQueue has been abandoned! - see doc/video_play_and_record.txt