Need some condition-check before matrix algebra
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                 Key: HAMA-153
                 URL: https://issues.apache.org/jira/browse/HAMA-153
             Project: Hama
          Issue Type: Bug
          Components: implementation
            Reporter: Samuel Guo
            Priority: Minor


some conditions will be checked before we construct the result matrix and 
compose the matrix algebra map/reduce job.
for examples,
A + B, we need check that A.rows = B.rows & A.columns = B.columns
A * B, we need check that A.columns = B.rows.

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