[jvm-packages] Expose setCustomObj & setCustomEval for XGBoostClassifier & XGBoostRegressor.

[yanboliang]

No description provided.

[codecov-io]

Codecov Report

Merging #3486 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master    #3486      +/-   ##
============================================
- Coverage     45.68%   45.66%   -0.02%     
  Complexity      188      188              
============================================
  Files           166      166              
  Lines         13171    13175       +4     
  Branches        445      445              
============================================
  Hits           6017     6017              
- Misses         6950     6954       +4     
  Partials        204      204

Impacted Files	Coverage Δ	Complexity Δ
.../dmlc/xgboost4j/scala/spark/XGBoostRegressor.scala	61.81% <0%> (-0.76%)	16 <0> (ø)
...dmlc/xgboost4j/scala/spark/XGBoostClassifier.scala	63.54% <0%> (-0.64%)	18 <0> (ø)

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