Merge branch 'stable-3.0'

* stable-3.0:
  Upgrade bazlets to latest stable-2.16 to build with 2.16.14 API
  Upgrade bazlets to latest stable-3.0 to build with 3.0.5 API
  Add config option for ignoring comments from specific author(s).

Change-Id: I8b1c53f4b22c875731805da56972d28f87a2041a