Basic item body lazy-loading sketched in, untested.
Scrubs out not-working item_body mutator.
Adds Number-typecasting to all number-y fields on the record model.
In the record model defaults() method, just merge the style defaults with the exhibit_id, instead of manually assigning all the style fields.
Uses official jQuery UI bower package, which now includes compiled assets.
Updates css / build paths to point to jQuery UI theme in official bower package.