LIB: SlidingLayer
 an easy way to include an autonomous layer/view that slides from the side of your screen and which is fully gesture ready
Preview: http://www.youtube.com/watch?v=162oD0XPM40
Author: @CesarValiente

Signed-off-by: scott <scott@ubuntu>

Conflicts:
	packages/SystemUI/AndroidManifest.xml
	packages/SystemUI/res/values/probam_attrs.xml
	packages/SystemUI/res/values/probam_dimens.xml

Change-Id: I68bf7a4c9af928561e2c6970101ea4709ae17323