Use DefaultVertexQuery for RexsterGraph.

RexsterGraph no longer supports the Vertex Query API in a native way in relation to Rexster.
Merge remote-tracking branch 'origin/master'

Conflicts:
	CHANGELOG.textile
Fixed #415 ... used ? wildcard instead of T for Comparable for compatibility with said classes in issue tracker.
Add a BatchGraph constructor for just the graph and buffer size.
Support factory instantiation of graphs.
Blueprints-DexGraph now works with dexjava 4.8.2
Added missing graph.shutdown() to newly added test case
Merge pull request #416 from SparsityTechnologies/master

Blueprints-DexGraph goes to dexjava 4.8.2
Merge pull request #417 from tinkerpop/testfix

Added missing graph.shutdown() to newly added test case
Merge branch 'master' of https://github.com/tinkerpop/blueprints