DeskClock: Add back flip and shake actions

Cherry-picked and ported from:
 * http://review.cyanogenmod.org/#/c/29894/

Change-Id: I222b6cd53a95db6f8662e7aef52aa6922d8a5d6a
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
DeskClock : Fix alarm statusbar icon visibility

Change-Id: Ib82aa6289ca6b54382b322a787f812964f191ce8