Reduce an rows of intermediate
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                 Key: HAMA-103
                 URL: https://issues.apache.org/jira/browse/HAMA-103
             Project: Hama
          Issue Type: Improvement
            Reporter: Edward J. Yoon
            Assignee: Edward J. Yoon
             Fix For: 0.1.0


Current multiplication map emit the n^2 rows to intermediate files. So, It have 
a lot of overhead to read/write them.
Summation also can be moved to map phase.

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