set unread message count in notifications.

was not able to squash commit requesting new pull

src/org/thoughtcrime/securesms/notifications/MessageNotifier.java

@@ -160,6 +160,7 @@ public class MessageNotifier {
     builder.setContentTitle(recipient.toShortString());
     builder.setContentText(notifications.get(0).getText());
     builder.setContentIntent(notifications.get(0).getPendingIntent(context));
+    builder.setContentInfo(String.valueOf(notificationState.getMessageCount()));
 
     if (masterSecret != null) {
       builder.addAction(R.drawable.check, context.getString(R.string.MessageNotifier_mark_as_read),
@@ -202,6 +203,8 @@ public class MessageNotifier {
                                          notifications.get(0).getIndividualRecipientName()));
     builder.setContentIntent(PendingIntent.getActivity(context, 0, new Intent(context, RoutingActivity.class), 0));
     
+    builder.setContentInfo(String.valueOf(notificationState.getMessageCount()));
+
     if (masterSecret != null) {
       builder.addAction(R.drawable.check, context.getString(R.string.MessageNotifier_mark_all_as_read),
                         notificationState.getMarkAsReadIntent(context, masterSecret));