Fix for PUB-663. Add Bernoulli distribution family as a loss function for 2 class categorical response in GBM.
Fix for PUB-663. Add a test of GBM with Bernoulli distribution, comparing with R gbm for prostate.csv dataset.
Add Junit test of Bernoulli loss function with prostate.csv
Re-orient the variable importance table for easier comparison with R
Merge branch 'anqi-gbm'