Settings: Heads up meets SlimKat....SlimKat meets Google IO [5/5]

5. Add in app info screen a checkbox to enable heads up for the app.
   As another possibility aside the longpress on the notification on
   notification drawer.

Change-Id: Ic944d78683d692600ead02a981f220a8a09c9491
heads up from slim

Conflicts:
	AndroidManifest.xml
	res/values/cr_strings.xml