Merge branch 'stable-3.1' into stable-3.2

* stable-3.1:
  Replace tika by overviewproject mime-types to detect mime types
  Upgrade bazlets to latest stable-3.0 to build with 3.0.13 API
  Avoid any uses or lookups of ffmpeg by Tika

Change-Id: I4ea7a359bdab7aea526e56ad3ead7bef0846d12b