WIP design of the advanced search
Added dropdown for advanced search link
Finished prototype for the advanced search
Fix the homepage form
Mobile optimized the advanced search dropdown
Add CopyrightedUrl model to Works

* Allows for multiple CopyrightedUrls to be associated with a work.
* Fixes a bug in highlighting
* Fixes a spelling problem
* Includes CopyrightedUrls in serialized json responses
* Updates seed data
* Fixes DeterminesWorkKind to handle arrays of copyrighted URLs