Deduplication: add failing integration test
Deduplication: scaffold the worker
Implement DuplicateDetector
Make duplicate anonymous contacts non-actionable
Deduplication: don't fail silently when can't save
Deduplication: retry every 2 hours
Deduplication: add triggering rake task with lock
Merge pull request #144 from alphagov/anonymous-feedback-deduplication

Anonymous feedback de-duplication batch processing