Add a menu to open battery info

PS 2: Add Screen on time
PS 3: Add deep sleep time
PS 4: Clean up
PS 5: Don't show as action, only show in menu

Change-Id: I53da7364879c9fd16ae1d98495aef7b985afd1fa

Conflicts:
	res/values/cfx_strings.xml
	src/com/android/settings/fuelgauge/PowerUsageSummary.java