0.12.0

Release 0.12.0 (2018-04-11)

Release notes are here: https://blog.bazel.build/2018/04/11/bazel-0.12.html

Baseline: b33e5af

Cherry picks:

• 3694099:
  Automated rollback of commit
  c2b332b.
• dbf7798:
  Emit SJD errors even if we don't know the label of a dependency
• 4c3098c:
  Android tools: remove mtime-modifications
• a1068c4:
  NDK cc_toolchains: include bundled runtime libraries in
  cc_toolchain.all_files
• b1be581:
  runfiles,Python: remove library from @bazel_tools
• 0a46220:
  Fix visibility of def_parser for remote builds
• 3c5373c:
  Remove visibility attribute from
  //third_party/def_parser:def_parser
• f54d7e5:
  Enable bulk writes in the HttpBlobStore
• 04ce86e:
  remote/http: properly complete user promise

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