trying to fix travis.ci problems
trying to fix travis.ci problems

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