Settings: Forward port Kill app back long press

Original author: DaneshM

PatchSet2
- rebased

Patchset3
- cleanup whitespaces

Change-Id: I5e9ae7da762615722ce9dc09c4b7053b77736a62

Conflicts:
	res/values/strings.xml
	res/xml/development_prefs.xml
	src/com/android/settings/DevelopmentSettings.java
Settings: Volume expandable and link

Conflicts:

	res/values/strings.xml

Change-Id: Id16e19e40243aaa2ca18bb3b1cbc6f50f19d06a8

Conflicts:
	res/values/arrays.xml
	res/values/strings.xml
	src/com/android/settings/RingerVolumePreference.java
	src/com/android/settings/SoundSettings.java