QS: Add dock battery tile (1/2)

Add a dinamic tile for devices with dock battery

Patchset 2: New icon set
            Rebased

Change-Id: I5e0e84da0b0f248fa9eb568c5d506b00cf3998b0
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>

Conflicts:

	packages/SystemUI/src/com/android/systemui/quicksettings/DockBatteryTile.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsController.java
	packages/SystemUI/src/com/android/systemui/statusbar/policy/BatteryController.java
	packages/SystemUI/src/com/android/systemui/statusbar/policy/DockBatteryController.java