settings: Allow Mock SMS (2/2)

This change brings the possibility of simulate the reception of SMS on real devices. Fow now,
the only way of simulate the reception of SMS is using the android emulator, but this hasn't have
a CM10 image.

This change enable the Settings part, at Settings/Developer Options/Allow mock SMS

Require: http://review.cyanogenmod.com/#/c/23017/1

Patch 2: Change mock locations and mock sms titles to not match the summary
Patch 3: Remove mock locations and mock sms summaries

Change-Id: Ibfa9745a4d03b7a54195883f17b7d041937087eb

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