Power Widget - picked from SlimBean, originally from CM

Conflicts:
	core/java/android/app/ContextImpl.java
	core/res/res/values/public.xml

Conflicts:
	packages/SystemUI/res/drawable/stat_power_background.xml
	packages/SystemUI/res/layout/status_bar_expanded.xml
	packages/SystemUI/res/values/strings.xml
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java