[SPARK-6487][MLlib] Add sequential pattern mining algorithm PrefixSpan to Spark MLlib#7258

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zhangjiajin wants to merge 12 commits intoapache:masterfrom

zhangjiajin:master

Commits on Jul 7, 2015

Add new algorithm PrefixSpan and test file.
zhangjiajin
committed

Commits on Jul 9, 2015

Commits on Jul 10, 2015

Add new object LocalPrefixSpan, and do some optimization.
zhangjiajin
committed

Commits on Jul 11, 2015

Modified the code according to the review comments.
zhangjiajin
committed

Commits on Jul 14, 2015