GIRAPH-682: LongNullHashSetEdges performance issue
GIRAPH-667: all workers suspended at 'saveVertices' when use out of core
Merge branch 'trunk' of https://git-wip-us.apache.org/repos/asf/giraph into trunk
GIRAPH-667
GIRAPH-468: Make Vertex an Interface (nitay)
GIRAPH-681: Graphviz Output Format (nitay)
GIRAPH-686: DiskBackedPartitionStore does not saveVertex after edges are loaded
GIRAPH-673: Input superstep should support aggregators like any
other superstep (Bingjing via aching)
GIRAPH-683: Jython for Computation (nitay)
GIRAPH-694 Setting configuration in GiraphConfiguration causes
non thread safe copies (aching)
GIRAPH-623: Website Documentation: table of parameters
GIRAPH-695: Add getCombiner and getComputation methods for
MasterCompute (aching)
GIRAPH-696: Should be able to spill giraph metrics to a specified directory on HDFS
GIRAPH-697: Clean up message stores (majakabiljo)
GIRAPH-693: Giraph-Hive check user code as soon as possible (nitay)
GIRAPH-688: Make sure Giraph builds against all compatible YARN-enabled Hadoop versions, warns if none set, works w/new 1.1.0 line (ereisman)
GIRAPH-311:  Master halting in superstep 0 is ignored by workers (majakabiljo)
GIRAPH-698: Expose Computation to a user (aching)
GIRAPH-676: A short tutorial on getting started with Giraph
GIRAPH-702: Fix multithreaded output (majakabiljo)