[SPARK-9656] [MLlib] [Python] Add missing methods to PySpark's Distributed Linear Algebra Classes#9441

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dusenberrymw wants to merge 8 commits intoapache:masterfrom

dusenberrymw:SPARK-9656_Add_Missing_Methods_to_PySpark_Distributed_Linear_Algebra

Commits on Apr 21, 2016

Adding remaining methods to PySpark BlockMatrix: cache, persist, validate, transpose.
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Adding remaining method to PySpark CoordinateMatrix: transpose.
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Adding remaining method to PySpark IndexedRowMatrix: computeGramianMatrix. Note that 'multiply' and 'computeSVD' are part of the SPARK-6227 PR.
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Adding remaining methods to PySpark RowMatrix: computeGramianMatrix, computeCovariance, computeColumnSummaryStatistics, columnSimilarities, tallSkinnyQR.
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Improving robustness of PySpark test for Python 2.6.
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Adding experimental tag to QRDecomposition.
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Adding @since annotations, and adding a comment to Scala.
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Adding the subtract method.
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