Set notification number for 2 and more messages

This adding feature to show counts only for 2 and more messages
like on Gmail app.

Extension for http://gerrit.aokp.co/#/c/8374/

Change-Id: Ic1d93df19f52742aeff932a7a1b4bb222fdb78b2
Signed-off-by: kecinzer <kecinzer@gmail.com>

Conflicts:
	src/com/android/mms/transaction/MessagingNotification.java