a minor nothing tweak.
better method name for StartStep inquiry and more work on TinkerElementStepStrategy to make it more concise.
Renamed baseGraph() to getBaseGraph() for consistency.
removed MessageCombiner interface for now in GraphComputer. I want a general solution to multi-typed messages, but Giraph is too strick on its combiner interfaces. Moreover, even if I ignore Giraph, its awkward for TinkerGraph. Added a note to docs about message combinbing and future support. Ref #279
renamed strategy() to getStrategy() in StrategyWrappedGraph.
Merge remote-tracking branch 'origin/master'
Renamed Item to Result in gremlin-driver.