Added SQLite store to plugin.py.
Added SQLite store to plugin.py.

Fixes issue 59

dbs/rdflib,ssssam/rdflib,RDFLib/rdflib,yingerj/rdflib,armandobs14/rdflib,ssssam/rdflib,avorio/rdflib,dbs/rdflib,dbs/rdflib,ssssam/rdflib,yingerj/rdflib,avorio/rdflib,marma/rdflib,RDFLib/rdflib,avorio/rdflib,avorio/rdflib,marma/rdflib,RDFLib/rdflib,dbs/rdflib,ssssam/rdflib,RDFLib/rdflib,armandobs14/rdflib,yingerj/rdflib,armandobs14/rdflib,marma/rdflib,marma/rdflib,armandobs14/rdflib,yingerj/rdflib