[SPARK-12869] Implemented an improved version of the toIndexedRowMatrix#10839

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Commits on Jan 19, 2016

Implemented an improved version of the toIndexedRowMatrix method of the BlockMatrix
Fokko Driesprong
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Commits on Mar 15, 2016

Updated the method based on the suggestion of @mengxr

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Fokko
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Commits on Mar 17, 2016

Resolved conflicts
Fokko Driesprong
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Updated the code based to make use of the Matrix iterator
Fokko Driesprong
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Commits on Mar 21, 2016