Merge branch 'stable-3.0'

* stable-3.0:
  Upgrade wiremock to 2.25.1
  Remove bazel-genfiles from .gitignore
  Replace bazel-genfiles with bazel-bin in documentation
  Upgrade bazlets to latest stable-3.0 to build with 3.0.3 API
  Bump bazel version to 1.0.0

Change-Id: Ie090830bc8817917ee21707cd9d2d85329b8ecaf