Add custom notification header option

* Tried this one awhile back and didnt seem to work...
well alot has changed since then so lets give it another whirl.

Change-Id: I2ac7cf1ec3fee117a1bc8257b99a46419881035b
Signed-off-by: scott <scott@ubuntu>

Conflicts:
	res/values/bs_strings.xml
	res/xml/notification_drawer_qs_settings.xml
	src/com/android/settings/slim/NotificationDrawerQsSettings.java