Kill app longpress back (2/2)

Conflicts:
	res/values/purity_strings.xml
Settings for clear all recents button

Conflicts:
	res/values-it/purity_strings.xml
	res/values/purity_arrays.xml
	res/values/purity_strings.xml
	res/xml/purity_system_settings.xml
	src/com/android/settings/purity/SystemSettings.java