Merge pull request #490 from juharris/GraphSailConnection-track_prev_subject

GraphSailConnection: Tracking the previous subject -- yes, this is smart. Nice.
Removed some deprecated calls and unnecessary casts
Reimplemented GraphSail's unique statements constraint, with a 30% decrease in indexing time (based on a 1M-triple SP2Bench data set). Put another way, you now only pay an extra 4% for uniqueStatements, rather than 40%
Merge pull request #482 from juharris/SailGraph.loadRDF

SailGraph.loadRDF: customized with RDFParser and RDFHandler
Merge branch 'master' of github.com:tinkerpop/blueprints

Conflicts:
	blueprints-graph-sail/src/main/java/com/tinkerpop/blueprints/oupls/sail/GraphSail.java