Merge branch 'stable-2.15'

* stable-2.15:
  Update bazlets to the latest on stable-2.14 to use 2.14.7 release API
  Properly escape the subject
  PropertyExtractor: Add null check for event.submitter

Change-Id: I135d0ec0589279663c4aee458c3aa7d310b76dda
tree: 09d8ea10e086f92d904ebb0fb2130c08b06e5420
  1. .settings/
  2. src/
  3. tools/
  4. .gitignore
  5. bazlets.bzl
  6. BUILD
  7. LICENSE
  8. WORKSPACE