[SPARK-18239][SPARKR] Gradient Boosted Tree for R#15746

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felixcheung wants to merge 4 commits intoapache:masterfrom

felixcheung:rgbt

Commits on Nov 3, 2016

Commits on Nov 4, 2016

update from feedback - doc default values, classifications with numeric label (force index label & predicted label to string), tests
felixcheung
committed

Commits on Nov 7, 2016

Add more tests from feedback, took a shot at updating doc for a couple of ml models
felixcheung
committed