feat/sparql-in-memory

[adlerfaulkner]

Changes the in memory storage option to use an RDF/JS store so that we can use a single translation between the OGM interface and SPARQL to query both SPARQL endpoints and in memory

[coveralls]

Pull Request Test Coverage Report for Build 6738317583

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 36 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.009%) to 92.084%

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Files with Coverage Reduction	New Missed Lines	%
src/util/SparqlUtil.ts	3	95.8%
src/SklEngine.ts	33	82.47%

Totals
Change from base Build 6702402769:	-0.009%
Covered Lines:	1099
Relevant Lines:	1180

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💛 - Coveralls