- structured data parser should set the media type explicitly if it does not receive it; added a default keyword argument, too
- Dataset is now a Graph as opposed to a ConjunctiveGraph, though this may change in future
Merge branch 'master' of https://github.com/RDFLib/rdflib
Merge branch 'master' of https://github.com/RDFLib/rdflib

Conflicts:
	rdflib/graph.py