Add validator that checks for duplicate pathnames

Project owner can now configure duplicate pathnames validator. Commits
which contain duplicate pathnames will be rejected. If y and z are
pathnames and y.equalsIgnoreCase(z), then y and z are duplicates.

Change-Id: Iaac644a07fc88e855cc9a041f0237157bda9d010
7 files changed
tree: aa528a9c2227c3ac8e7cf02d7f20dd4473d366cb
  1. .settings/
  2. lib/
  3. src/
  4. .buckconfig
  5. .gitignore
  6. BUCK
  7. LICENSE