Merge branch 'stable-3.0' into stable-3.1

* stable-3.0:
  Make persistent task keys stable

Change-Id: I2cf44bc4e9810c83fa7afee4290fca25dc50724b
tree: bf48a7faaf2948e9aa0df99c55fc94e8d4775c9d
  1. .gitignore
  2. .mailmap
  3. .settings/
  4. BUILD
  5. LICENSE
  6. src/