Add an inline thumbnail library file for collections and communities
Can now add a thumbnail to a collection via the front end.
Images now resize correctly without use of Hydra derivatives.
Remove completely extraneous inline_thumbnail module, add thumbnail content datastream to community/collection in the expected way.
Add thumbnails to communities.
Refactor out logic for creating inline thumbnails into a 'service object', which may or may not be prudent.  Fix update methods to also account for thumbnails.
Moves thumbnail out of the params[:set] space.  Making it an accessible attribute didn't seem like the right move.
Merge pull request #144 from nu-lts/feature/thumbnails_on_collections

Feature/thumbnails on collections