define all the Dublin Core elements as pre-defined properties, and use the dc/elements/1.1 namespace instead of dcterms.
Implement basic SPARQL-based administrative search
wire in a sparql search form.
When storing a URI property that points to a fcrepo4 resource, also store a WEAKREFERENCE node to the same, so we can e.g. query against it easily.
Merge pull request #147 from futures/sparql

SPARQL endpoint for Admin Search

Resolves: https://www.pivotaltracker.com/story/show/60713796