Update Kaggle CTR script to use bernoulli distribution for GBM.
GBM - depth 10, min.obs 10, bins 20, trees 100, lr 0.1
LogLoss on training data: 0.392463
LogLoss on validation data: 0.4027492
LB: 0.4033703
Merge branch 'master' of https://github.com/h2oai/h2o