upgrade paperclip
downgrade to slightly lower
lock
track that a field is changed without using updated_at because paperclip goes and modifies field_updated_at AFTER reprocessing (ogawdwhy)
attempt to use md5 fingerprint for deciding when to enqueue resizes
try paperclip 3.4.1 again
use new style mongoid dirty checking to determine when to enqueue
Merge pull request #2 from substantial/upgrade-paperclip

Upgrade paperclip