Merge branch 'stable-2.12'

* stable-2.12:
  Bump plugin API version used to 2.12 release
  Build with API version 2.12-rc0
  Build with API version 2.11.5

Change-Id: Id3ddd7ed99180f6a1e7dfe48c35bb6d87f1e0453
tree: d0b20d132772e3adcc0aed7e87dc3b826316fa9b
  1. lib/
  2. src/
  3. .buckconfig
  4. .gitignore
  5. BUCK