Framework: Add option to always show battery status on lockscreen (1/2)

Based on the feature by burnsra in CM7

Authored by Blunden
Tweaked by DvTonder

Screenshot: https://dl.dropbox.com/u/50993944/Screenshot_2012-08-03-08-47-10.png

Patchset 1-8: Initial code
Patchset 9  : Minor tweaks

Change-Id: I642da4dcd82a776a74d77031d37acc76f97b25af

Conflicts:
	core/java/android/provider/Settings.java
	policy/src/com/android/internal/policy/impl/KeyguardStatusViewManager.java
	policy/src/com/android/internal/policy/impl/KeyguardUpdateMonitor.java