Merge branch 'stable-2.12'

* stable-2.12:
  MergeValidationListener: Adjust to the changed onPreMerge() signature

Change-Id: I2297bc0f4582dbe054f28701adc1150136887d08
tree: 5dd04f5767783e08559c4e6ce7a03b2d5f94418b
  1. lib/
  2. src/
  3. .buckconfig
  4. .gitignore
  5. BUCK
  6. LICENSE
  7. pom.xml