Fixed conditions for checking media-type when loading local RDF files.
Fixed conditions for checking media-type when loading local RDF files.

antoniogarrote/rdfstore-js,antoniogarrote/rdfstore-js,JuniperChicago/rdfstore-js,ahmadassaf/RDF-Store-JS,ahmadassaf/RDF-Store-JS,antoniogarrote/rdfstore-js,ahmadassaf/RDF-Store-JS,nicola/rdfstore-js,JuniperChicago/rdfstore-js,nicola/rdfstore-js,antoniogarrote/rdfstore-js,JuniperChicago/rdfstore-js,ahmadassaf/RDF-Store-JS,JuniperChicago/rdfstore-js,nicola/rdfstore-js,nicola/rdfstore-js