Nan Zhu 428453f7d6 [jvm-packages] fix the persistence of XGBoostEstimator (#2265) ...

* add back train method but mark as deprecated

* fix scalastyle error

* fix the persistence of XGBoostEstimator

* test persistence of a complete pipeline

* fix compilation issue

* do not allow persist custom_eval and custom_obj

* fix the failed tesl

2017-05-08 21:58:06 -07:00

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