Merge branch 'stable-2.15' into stable-2.16

* stable-2.15:
  Upgrade bazlets to latest stable-2.15
  Bump required bazel version to 1.0.0rc2
  Upgrade bazlets to latest stable-2.14

Change-Id: I8566c68c4e2cf777aafa7602e69d00618e583b19

.bazelversion

diff --git a/.bazelversion b/.bazelversion
index 09d1d01..8862dba 100644
--- a/.bazelversion
+++ b/.bazelversion
@@ -1,2 +1 @@
-0.29.0
-
+1.0.0rc2