Mms: Add privacy mode notifications

This add privacy mode feature to notifications, user and message are hidden in
status bar and notifications area when privacy mode is enabled

Patch set 1-4 : Initial commits
Patch ser 5   : Slight wording change of summary string

Change-Id: I20f5fd198d51d7079345708725a58ef2c2a71b7f

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

Signed-off-by: travp624 <travp624@gmail.com>
Mms : Default privacy mode to off

Change-Id: I3d4037816662707c795c60e0db47f0adbb2e08ab
Mms: Use a more familiar 'mark as read' icon

The existing 'mark as read' icon is a bit confusing and doesn't make clear
where it is for. This commit replaces the existing cion with the read icon
which is used in Email and Gmail.

Before: http://goo.gl/GXKfj
After:  http://goo.gl/RTEwa

Change-Id: I3c7ae7aa6173e29e687a7e0d564b2d54fcc61a51