[3/3] Install persistence support

New fragment to control install persistence settings.

PS3: Rebase

Change-Id: I76600aa38f450954e9a22c1e549502d3a069aae4

Conflicts:
	res/values/strings.xml
RC: show back action arrow in main menu

Change-Id: I1bfee2c094d996d4615a77b84b713d05d0b55edd
Signed-off-by: Jonathan Steadman <xxwhitehawk@gmail.com>