[SPARK-6791] [ML] Add read/write for CrossValidator and Evaluators#9848

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jkbradley wants to merge 4 commits intoapache:masterfrom

jkbradley:cv-io

Commits on Nov 19, 2015

Commits on Nov 20, 2015

added read/write to CrossValidatorModel
jkbradley
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Commits on Nov 21, 2015

Changed DefaultParamsWriter to save extraMetadata at same level as other metadata. Cleanups to CrossValidator save/load based on code review. Refactoring to eliminate some duplicate code.
jkbradley
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