[SPARK-9750][MLlib] Improve equals on SparseMatrix and DenseMatrix#8042

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feynmanliang wants to merge 6 commits intoapache:masterfrom

feynmanliang:SPARK-9750

Commits on Aug 7, 2015

Add failing sparse matrix equals tests
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Fix failing test
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Add casts
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Commits on Aug 10, 2015

Add equality based on matrix semantics, not representation
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Commits on Aug 11, 2015

Sparse matrix compare for equals
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Breeze compare for dense matrices as well, in case other is sparse
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