GIRAPH-473: InputSplitPathOrganizer should be aware of multiple threads (apresta via ereisman)
GIRAPH-459: Group Vertex Mutations by Partition ID
GIRAPH-477: Fetching locality info in InputSplitPathOrganizer causes jobs to hang (apresta via ereisman)
GIRAPH-431: Support edge and vertex value input formats in GiraphRunner (apresta)
GIRAPH-254: Constant Variable name misspelled in HashMasterPartitioner.java (Gustavo Salazar Torres via ereisman)
GIRAPH-472: Refactor MapFunctions enum to be more general (ereisman)
GIRAPH-453: Pure Hive I/O (nitay)