Refactor metagraph into it's own package
Merge MetaGraph and DendriteGraphFactory
Cleanup MetaGraph and add tests for MetaGraph.getGraph{,s}
Remove unnecessary metadata back pointers
Throw an exception if getting a vertex of the wrong type
clean up dead code
Fix bin/dendrite run-jung-pagerank
Fix a duplicated dependency
Merge pull request #46 from Lab41/tests-and-cleanup

Tests and cleanup