Adds full metadata editing for Collections (same DC fields as GenericFiles)

Fixes hydra-editor style partials in views/records.

refs gwu-libraries/gw-sufia#82
refs gwu-libraries/gw-sufia#25
Thanks, @flyingzumwalt 

@mtribone @jcoyne is this going to set us back on the Bootstrap3ification of Sufia, or is it cool?