Updated controller such that a proxy, passed in at the very beginning of the upload process, would be carried through and used to designate the depositor for the object plus all its derivatives.
Merge branch 'develop' into proxying
Merging in changes to proxying branch.
Update proxy to use employee instead of user object.
Merge branch 'develop' into proxying
Update view to check proxy_staff?
Gets proxy upload mostly working
Adds a field for storing the proxy_uploader to the drs_properties_datastream.
Make the changes necessary to get proxying working for real, which were various.  Fixes #468
Fix tests.
Add methods for looking up proxy_uploader/getting the true depositor on the solr document.
Merge pull request #470 from NEU-Libraries/proxying

Proxying