Merge change 362 into donut

* changes:
  generalize -t option to add and remove tags in fingerprints
tree: b79740ea07505a95297ac6fecc4a36e1acb781e5
  1. core/
  2. libs/
  3. target/
  4. tools/
  5. buildspec.mk.default
  6. cleanspec.mk
  7. envsetup.sh