added a test for SPARQL "default" negation (in conjunctive LP querying).  See http://www.w3.org/2005/rules/wg/wiki/negation
added a test for SPARQL "default" negation (in conjunctive LP querying).  See http://www.w3.org/2005/rules/wg/wiki/negation

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