Use premis hasOriginalName (and hasSize) predicates on fedora:binary resources

Expose the premis:hasOriginalName propertyfrom the HTTP API using
the Content-Disposition ("filename") header for both fcr:content
and a POST with a binary payload.

Expose originalFileName throughout the kernel's Datastream API.

Fixes https://www.pivotaltracker.com/story/show/61500736