This moves changes initially made to our fork of the Sufia Gem into our own app, where they arguably belong.  Covers only those alterations made to get the GenericFile model more in line with what we do.  Will see if I can get controller/job changes pushed over next
update_metadata_from_upload_screen is now correctly overriden inside our version of generic_files_controller.rb.
Not switching everyone over to local dev copy of the Sufia gem by default
Merge pull request #37 from nu-lts/feature/move_changes_out_of_core

Feature/move changes out of core