Blazegraph extension to improve performance for Wikibase

Element	Missed Instructions	Cov.	Missed Branches	Cov.	Missed	Cxty	Missed	Lines	Missed	Methods	Missed	Classes
Total	4,587 of 12,837	64%	484 of 1,057	54%	536	1,213	1,057	2,863	219	678	24	130
org.wikidata.query.rdf.blazegraph.ldf		0%		0%	113	113	210	210	45	45	11	11
org.wikidata.query.rdf.blazegraph.mwapi		65%		53%	86	203	176	499	27	92	2	14
org.wikidata.query.rdf.blazegraph.throttling		55%		73%	57	145	150	315	37	93	1	13
org.wikidata.query.rdf.blazegraph.constraints		38%		26%	72	96	124	187	33	53	4	11
org.wikidata.query.rdf.blazegraph.geo		49%		39%	34	61	114	232	10	33	1	6
org.wikidata.query.rdf.blazegraph		72%		69%	50	151	100	391	29	100	4	20
org.wikidata.query.rdf.blazegraph.inline.literal		72%		59%	37	74	36	150	7	31	0	3
org.wikidata.query.rdf.blazegraph.inline.uri		38%		35%	15	25	46	72	6	14	1	3
org.wikidata.query.rdf.blazegraph.filters		80%		75%	26	83	41	206	14	56	0	10
org.wikidata.query.rdf.blazegraph.events		90%		82%	14	94	29	235	7	74	0	12
org.wikidata.query.rdf.blazegraph.label		94%		83%	27	135	22	289	1	58	0	9
org.wikidata.query.rdf.blazegraph.categories		50%		n/a	1	4	5	14	1	4	0	1
com.bigdata.rdf.internal		80%		66%	4	11	4	23	2	8	0	2
org.wikidata.query.rdf.blazegraph.vocabulary		100%		100%	0	18	0	40	0	17	0	15