Framework: Forward port Long press back to kill app (1/2)

Original port: David van Tonder
Original author: DaneshM

Change-Id: I54f4fb861897fe713cffa15422535c5091a0c095

Conflicts:
	core/java/android/provider/Settings.java
	core/res/res/values/symbols.xml
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java