Add FusekiDatabaseSimpleQueryLookupIntegrationTest

- Adds \SMW\SPARQLStore\SparqlDBConnectionProvider
- Adds $smwgSparqlDatabaseConnector to mitigate arbitrary class
assignments in $smwgSparqlDatabase
Merge pull request #342 from SemanticMediaWiki/fuseki-integration-test

Add FusekiDatabaseSimpleQueryLookupIntegrationTest