added Element.remove() and Vertex.addEdge(Vertex,String). Easy for all implementations. Hard for wrappers. Lots of Wrapper code changed.
Fixed a ConcurrentModificationException bug in TinkerGraph. JavaDoc.
Merge remote-tracking branch 'upstream/master'
updated LICENSE year.
fixed #354. transaction closed after indices loaded.
Added tests to cover transaction consistency across threads.
Merge remote-tracking branch 'upstream/master'
Check if directory exists in load and save methods