DeskClock: Add option to toggle unlock on dismissal of alarm

* Still need easy implementation to turn screen back off.

Change-Id: I70995cd1719c1f8e349fc2b50c76f279e384d27e
Signed-off-by: bmc08gt <bmc08gt.teamb00sted@gmail.com>

Conflicts:
	src/com/android/deskclock/SettingsActivity.java