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-: IO Formats for handling Yahoo Webgraph
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)
Merge remote-tracking branch 'origin/trunk' into yahoo

Conflicts:
	giraph-hive/src/main/java/org/apache/giraph/hive/common/HiveUtils.java