all: merge master into release-branch.go1.7

Change-Id: Ifb9647fa9817ed57aa4835a35a05020aba00a24e
diff --git a/VERSION b/VERSION
new file mode 100644
index 0000000..e95a35a
--- /dev/null
+++ b/VERSION
@@ -0,0 +1 @@
+go1.7rc3
\ No newline at end of file