Merge branch 'stable-3.0'

* stable-3.0:
  Upgrade bazlets to latest stable-2.15
  Upgrade bazlets to latest stable-2.14

Change-Id: I05b31e8e4b2dffda59ba5e4b43a00ff152c99150
diff --git a/.bazelversion b/.bazelversion
new file mode 100644
index 0000000..09d1d01
--- /dev/null
+++ b/.bazelversion
@@ -0,0 +1,2 @@
+0.29.0
+