Rename txid into identifier. Make identifier an optional parameter. Pass graph element _id in properties hash in addVertex() method.
Make gremlin property of Element no longer writable
g is no longer global in tests
Add Grex.gremlin() method
Grex.connect() now returns an instance of itself instead of Graph
Move _() method from Graph to Gremlin class. Remove said method from Pipeline.
Make _() no longer append a dot to Gremlin script string
Move addVertex and addEdge methods from Transaction to Graph class. Remove Transaction class.
Update default api to use instances of Gremlin instead of Graph. Update constructors for Gremlin, Graph and Pipeline classes accordingly.
Fix some tests
Fix retain(), but changes API a bit by adding g property to gRex prototype
Fix g.idx() test
Fix tests for addVertex() and addEdge()
Rename and move test files. Remove some console.log().
Update transaction tests