Settings: Forward port long-press-back to kill app (1/2)

Change-Id: I996a9322e613b921dc57044e9cb3d45f11b6df67
Settings: Forward port long-press-back to kill app (1/2)
From Danesh Mondegarian <daneshm90@gmail.com>
Conflicts:
	src/com/android/settings/DevelopmentSettings.java
Settings: last app action in long press

Change-Id: I72d9cb5bca5eedd20ea80ee69d370a478e59def4