First cut at converting PreservationEvent model from ActiveFedora to ActiveRecord
Added #preservation_events_permissions, called from #custom_permissions.
Added migration for PreservationEvent ActiveRecord model
Added and modified PreservationEvent model tests
Finished the PreservationEvent post-migration work
Merge branch 'develop' into pe-post-migration
To hopefully fix Travis CI build failure
Removed commmented code
Merge pull request #233 from duke-libraries/pe-post-migration

Pe post migration