Quicksettings: Sleep tile.

* Click goes to sleep.
* Long click opens display settings.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
Change-Id: I3eeae514535e9edff72f233e18d8f8dfaadf3517

Conflicts:
	packages/SystemUI/res/values/snacks_strings.xml
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettings.java