[SPARK-13969][ML] Add FeatureHasher transformer#18513

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MLnick wants to merge 13 commits intoapache:masterfrom

MLnick:FeatureHasher

Commits on Jul 3, 2017

initial WIP
Nick Pentreath
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Further work
Nick Pentreath
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Clean up
Nick Pentreath
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Add tests
Nick Pentreath
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Copy, save/load, clean up
Nick Pentreath
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Move numFeatures to HasNumFeatures shared trait
Nick Pentreath
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Update shared params from codegen run
Nick Pentreath
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Update tests. Null values ignored in feature hashing.
Nick Pentreath
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Commits on Jul 12, 2017

Revert "Move numFeatures to HasNumFeatures shared trait"
Nick Pentreath
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Address various review comments
Nick Pentreath
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Commits on Jul 18, 2017

Address review comments 2
Nick Pentreath
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Commits on Jul 25, 2017

Update doc string with more detailed behavior info
Nick Pentreath
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Commits on Jul 26, 2017

Add @Experimental tag
Nick Pentreath
committed