added HashSet to GremlinKryo serialization classes as its needed for new Path representation.
Update the semantics of the LoadGraphWith annotation.
Get giraph optout annotations looking sensible again.
Remove notion of FeatureOverride.
Get rid of @Ignore on giraph graph computer tests.  Converted to integration test.
CHANGELOG updates.
Update changelog with work from recent days.
Merge remote-tracking branch 'origin/master'

Conflicts:
	CHANGELOG.asciidoc
all methods that are expensive in Gremlin-Groovy are now moved to SugarPlugin. g.V().out() is the norm now... for @dkuppitz. Updated the docs -- painful. Fixed #80.
Memory.get() and SideEffects.get() no longer return Optional but instead throw an IllegalArgumentException. Added a boolean exists(key) method as a helper.