add Settings.System boolean helper methods

Change-Id: I749d15a7c6956d938698f16ebde185b114f7f15a
Fix a programmatic smooth scroll bug

Bug: smoothScrollToPosition() stops at child view of which height is
higher than list view itself.

Change-Id: I695ca9db4c706aa7f365967dd3916f9a01917346
Signed-off-by: Yongyi Li <yongyi.li.cn@gmail.com>
 Implement "real" KitKat color scheme.  pt2 (forgotten values)
    http://forum.xda-developers.com/showthread.php?t=2634743
Use .9.png images for quick settings tile background.

Change-Id: I17cd77006e8da2fe629d63e0932c88041e81f07c

Conflicts:
	packages/SystemUI/res/drawable/qs_tile_background.xml

Conflicts:
	packages/SystemUI/res/drawable/qs_tile_background.xml