New setting under "Debug settings" that enables the development shortcut

Resolve Conflicts:
	src/com/android/settings/DevelopmentSettings.java

Conflicts:
	res/values/slim_strings.xml
	src/com/android/settings/DevelopmentSettings.java

Change-Id: I0dd66e8c01bf1c3aa98b4b49aa5cb0c3b9f4ebe2