Calling statements on a repository should return results from default graph

[RickMoynihan]

There are methods already in sesame which we could leverage to do this... with a thread to pipe things into a sequence etc...

(let [r (repo)]
  (grafter.rdf.protocols/add r [(grafter.rdf.protocols/->Quad ":a" ":a" ":a" nil) (grafter.rdf.protocols/->Quad ":a" ":a" ":a" ":c")])
  (.exportStatements
   (->connection r) nil nil nil false
   (reify org.openrdf.rio.RDFHandler
     (handleStatement [this statement]
       (println statement))
     (handleNamespace [this prefix uri]
       ;;TODO: are namespaces re-written? Need to re-write results if
       ;;so...
       (println prefix))
     (startRDF [this] (println "start"))
     (endRDF [this] (println "end"))
     (handleComment [this comment] (println "comment"))) (into-array Resource [])))