Merge pull request #33 from alisoncallahan/bio2rdfapi

Added fix to xmlapi.php to consider additional string patterns for parsi...
removed biopax2bio2rdf because of arc dependency
added homepage and parent dataset
added release parameter
separated the metadata declaration from label+description
removed label generation when label is provided
changed expansion on any protocol scheme
added nq suffix to filename
added new lines for warning and notice messages
removed automatic download, and added dataset graph option
cache time of 0 should force download
minor
Added check in initialize function to ensure that indir and outdir end with slash