[1/2] Base: Double tap to sleep

Double tap statusbar to sleep.

OmniGears: https://gerrit.omnirom.org/#/c/4611/

Change-Id: I4c54718e8ec8774677d13917b3a7ffa3b4b18cb5

Conflicts:
	core/java/android/provider/Settings.java
set transition speeds to .5