Create class SPARQLExtractor - move method extractFromSPARQLEndpoint here
- issue #356
Remove method extractFromSPARQLEndpoint from RDFDataUnit interface.
- issue #356
Remove methods addFromSPARQLEnpoint from RDFDataUnitHelper interface
- issue #356
Remove implementation of methods add/extractFromSPARQLEndpoint in BaseRDFRepo
- issue #356
Update RDF extactor - using SPARQL extractor for extraction
- issue #356
Remove test in RDF module testing extractFromSPARQLEndpoint
- issue #356
Update SPARQLLoaderTest - move 1 test from RDF module
Create SPARQLExtractorTest class in SPARQL extractor module
- move test from RDF module
- issue #356
Add getRDFParser method to RDFDataUnit interface
- neeed for using in SPARQL extractor
- issue #356
Make public method getRDFParser in BaseRDFRepo
- need for SPARQL extractor
- issue #356