Add \SMW\SPARQLStore\TurtleTriplesBuilder

- Move code from SparqlStore to TurtleTriplesBuilder
- Add SimpleQueryLookupWithoutBaseStoreIntegrationTest
- Add SparqlStore::doSparqlDataUpdate to update only the Sparql back-end
- Add TurtleTriplesBuilderTest
Merge pull request #361 from SemanticMediaWiki/sparql-triples-builder

Add \SMW\SPARQLStore\TurtleTriplesBuilder