Starting 1.7.0 version

Change-Id: I3c567235e187116edd8b795d2a6e6dfcf3937c67
diff --git a/VERSION b/VERSION
index 9edc58b..de023c9 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.6.4
+1.7.0-dev