Add Display Rotation settings

Originaly authored by Robert Burns (burnsra)

Change-Id: I4f96b3f804ee4732b277c35340790f3561d69764

Conflicts:
	res/values/strings.xml
	src/com/android/settings/DisplaySettings.java
Clean up powermenu

Change-Id: Ida5f9fa7dd5c880e8ac29c25b7c2118ce2d14be2