am 6af8f100: Merge "Upgrade Proguard to 5.1."

* commit '6af8f1004e0efe02a138286a34e833d1f3d227d7':
  Upgrade Proguard to 5.1.
tree: 9ac962825d41c4fb8ad1ec0fc2e8b441b42d3869
  1. bin/
  2. build/
  3. docs/
  4. examples/
  5. lib/
  6. src/
  7. Android.mk
  8. CleanSpec.mk
  9. NOTICE
  10. README