[SPARK-8519][SPARK-11560][SPARK-11559] [ML] [MLlib] Optimize KMeans implementation#10306

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yanboliang:spark-8519

Commits on Dec 15, 2015

Commits on Dec 16, 2015

disable one test case of PowerIterationClustering
yanboliang
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Commits on Dec 17, 2015

fix iteration terminal condition
yanboliang
committed