GIRAPH-915: With BigDataIO some messages can get ignored (majakabiljo via pavanka)
GIRAPH-922: SimpleEdgeStore has a bug causing NPE (pavanka)
fix build error (pavanka)
GIRAPH-919: Add worker to worker communication (majakabiljo)
GIRAPH-916: Wrong number of vertices stored reported to command line (majakabiljo)
GIRAPH-923: Upgrade Netty version to a latest stable one (pavanka)
GIRAPH-713: Provide an option to do request compression (pavanka)
GIRAPH-925: Unit tests should pass even if zookeeper port not available (edunov via pavanka)
GIRAPH-903: Detect crashes of Netty threads (edunov via pavanka)
GIRAPH-912: Support succinct representation of messages in messagestores (pavanka)
GIRAPH-929: setIfUnset for EnumConfOption (pavanka)
GIRAPH-921: Create ByteValueVertex to store vertex values as bytes without object instance (akyrola via majakabiljo)
GIRAPH-924: Fix checkpointing (edunov via majakabiljo)
Merge remote-tracking branch 'upstream/trunk' into trunk