enabling the ability to use the SPARQL backend for remote endpoint that did not contain a SysOntology
SPARQL Backend: if no graphs configured the store will be queried to receive available graphs
Merge branch 'feature-remoteSparqlEndpoint' of github.com:AKSW/Erfurt into feature-remoteSparqlEndpoint

Conflicts:
	library/Erfurt/Store/Adapter/Sparql.php