Update artwork user interface.

Add functionality to index page to feature/unfeature artworks as well as
delete them. Allow viewing filtered subsets of all artworks including
featured/fanart/year created.
Add flagging artwork as fanart.
Add best_in_place edit functionality to show page.
Fix layout & thumbnails for three content columns.

Add svg.js to create circular images. Add additional markup so that
descriptions are placed to the right of the thumbnails on tablet
devices.
Add banner banner image and convention picture.

Use foundations data interchange to load file based on screen size. Also
cleaned up controller to fetch only the needed data for landing screen.