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
 Add option to start widgets maximized

Conflicts:
	core/java/android/provider/Settings.java
Fix lockscreen timeouts
Custom Lockscreen background
SystemUI: Remove the dark pixel artifacts from the back arrow drawable

The arrow had some mostly transparent pixels that made it look
kind of like the device had defective pixels. Found by Cyril Mottier.

Change-Id: Ia78453868ebe7e3291d01c96b9beafc78ea3cdcc
Lockscreen: Fix mdpi layout issues

Before: http://i.imgur.com/gXNUt97.png
After: http://i.imgur.com/ppevA6M.png

Signed-off-by: Michael Bestas <mikeioannina@gmail.com>

Change-Id: I5bc893f12096d288d04d7cfa442b471002178a3a
Clarify the documentation of SparseArray.indexOfValue.

Bug: https://code.google.com/p/android/issues/detail?id=53297
Change-Id: I28725a2d03d4c11948bfe4fb90d730c86bf41481