Superuser: Add some AOSP icon love

Patch Set 1-2:	* replace some of the current Icons with the AOSP one's
Patch Set 3:    * rebased

		  Before: http://goo.gl/KSKrs
		  After:  http://goo.gl/5sjJK

Change-Id: I87a7f8f0138e954a9d71d3dbdc60277533e2189c