Save half of maximum memory used from messaging

                 Key: GIRAPH-104
             Project: Giraph
          Issue Type: Improvement
            Reporter: Avery Ching
            Priority: Critical

Currently, the amount of memory that Giraph uses for messaging is huge.  This 
JIRA will reduce the messaging memory by half and provide periodic updates of 
memory for debugging.  Details are below:

Refactored RandomMessageBenchmark to an internal vertex class.  Added 
aggregators to RandomMessagesBenchmark to track bytes, messages, and time for 
the messaging.  Adjusted the postSuperstep() to be called after the flush() for 
more accurate timings.

Added periodic minute updates for message flushing (which can take a while, 
especially on the memory benchmark).  This helps to see how progress is going 
and gives an ETA.

Memory optimizations include:
- Clear the message list after computation 
- Free vertex messages on the source as the flush is going on 
- TreeMap -> HashMap for VertexMutations
- Sizing the ArrayList properly in transientInMessages

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