Mms: add blacklist functionality - CM

Taken from the patch for the Phone app.

Original code written for CM7 by Cytown, Cyanogen and nhnt11.

Modified for CM10.1 by Danny Baumann and dvtonder.

Adapted for the MMS app by jt1134.

Change-Id: Ie229c31fbac3f6b9cb311664c446228e0aaae588

Conflicts:
	res/values/strings.xml
	src/com/android/mms/ui/MessagingPreferenceActivity.java