Starts support branch and improve .gitreview

Change-Id: I53389fadcc93710e1e0f8611ac7f956b994be74e
diff --git a/.gitreview b/.gitreview
index 028de3f..aa5bf47 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,3 +3,4 @@
 port=29418
 project=mcast.git
 defaultremote=origin
+defaultbranch=mcast-1.4