Release notes and tag for 2.5.0

Change-Id: Iff3a561d04323ff4b175e1f5fd4a508550579696
diff --git a/VERSION b/VERSION
index 69fa968..437459c 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.5.0-dev
+2.5.0