Rollbacking H2O World banner on front page.
Revert "H2O World banner on H2O page."

This reverts commit d00991da61d27f39691b3c7f3a3761e82a67a7fa.
Learn h2o on front page.
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
fix double printing in dl
mention bernoulli distro in docs

Conflicts:
	R/h2o-package/man/h2o.gbm.Rd