Merge branch 'stable-3.0'

* stable-3.0:
  Upgrade bazlets to latest stable-3.0
  Add .bazelversion
  Upgrade bazlets to latest stable-2.16

Change-Id: I0578a5e82989649d36c1416f5de4f669863773cd
diff --git a/.bazelversion b/.bazelversion
new file mode 100644
index 0000000..8862dba
--- /dev/null
+++ b/.bazelversion
@@ -0,0 +1 @@
+1.0.0rc2