Ensure URI generation is referencing new go_context.jsonld

[dustine32]

This can be done relatively easily by calling uri() on the ontobio writer (TurtleRdfWriter). Recent ontobio update points to this new JSONLD. There may still be a few rdflib.term.URIRef() calls that explicitly set prefix (possibly incorrectly).

For context:
geneontology/go-site#617
biolink/ontobio#167

[dustine32]

This was fixed in #9 . The expand_uri_wrapper() method now used points to go_context.jsonld for prefixes.