Shared infrastructure for varimp computing.
WIP varimp on the fly
Merge remote-tracking branch 'origin/master' into mm_fix_varimp

Conflicts:
	src/main/java/hex/gbm/SharedTreeModelBuilder.java
Merge branch 'master' of github.com:0xdata/h2o into mm_fix_varimp
did we lose lambda max in glm2 submodels?
Merge branch 'master' of github.com:0xdata/h2o
Fix color of ROC curve on x/y axis.
Merge branch 'master' of https://github.com/0xdata/h2o
auc json schema?
Merge branch 'master' of github.com:0xdata/h2o
update test to match fv one
better
Merge branch 'master' of github.com:0xdata/h2o
Merge branch 'arno-deeplearning2'
Reduce the length of examples to conform with CRAN guidelines.
Merge branch 'master' of https://github.com/0xdata/h2o
Updated quantile page with Kevin's implementation from Summary2.
Merge branch 'master' of github.com:0xdata/h2o
Fix help string.
Update JSON interface for AUC. Always return all metrics for threshold criteria, and one long vector of specified metric of interest, together with all CMs.