Merge branch 'stable-2.16' into stable-3.0

* stable-2.16:
  Make persistent task keys stable

Change-Id: Iefda465c739f4669b5394d3c57f7abe0d7513b5f
tree: 767fc6f4d27ebdd5e86b610c9e8df7abdd51215c
  1. .gitignore
  2. .mailmap
  3. .settings/
  4. BUILD
  5. LICENSE
  6. src/