Initial support for RDF containers and multiple creators.
Comma-separate creators in format()
Update NEWS.
Cleanup leftover test code.
Support property semantics and RDFa output in the HTML formatter.
Use different predicates for text and URL properties.
Include both rel and property in the RDFa is there a urlProperty and a textProperty.
Update NEWS.
Merge pull request #16 from commonsmachinery/rdfa-output

Rdfa output