Mark MediaObject, MasterFile, Derivative, and Admin::Collection as migratable
First stab at R1=>R2 MediaObject, MasterFile, and Derivative migrations
Remove collections from descMetadata after assigning Collection objects
Smarter, just-in-time collection creation
First cut at a migration of the system groups
Add 'ActiveRecord' migrations for avalon.yml and MediaObjects.
Don't change discover/read rights if the object already has explicit ones defined
Replace the 'collection_manager' group with 'manager' in object rights
Create an administrator group if it does not already exist and use the first person in group_manager as the default value
Newly-instantiated groups shouldn't be dirty
Freeze rubyzip at v0.9.9.
The 'manager' group can exist at migration time, as long as 'collection_manager' doesn't.
Fix tests that fail because of duplicate usernames
Switch EncodingProfileDocument from NokogiriDatastream to OmDatastream
Merge pull request #130 from avalonmediasystem/feature/VOV-1872

feature/vov 1872 (Upgrade & Migrate from R1 to R2)