[SPARK-18324][ML][DOC] Update ML programming and migration guide for 2.1 release#16076

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yanboliang wants to merge 3 commits intoapache:masterfrom

yanboliang:spark-18324

Commits on Nov 30, 2016

Programming guide update and migration guide
yanboliang
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Commits on Dec 1, 2016

Address comments.
yanboliang
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Commits on Dec 2, 2016

Remove SPARK-18481 from breaking changes.
yanboliang
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