Fix minor code issues.
Merge branch 'master' of https://github.com/0xdata/h2o
Resolve PUB-368 - Allow choice of sampling strategy for validation set.
Either uniform or stratified.
Also disable Poisson distribution as default stratified sampling strategy,
since it may lead to 0 class counts for small data sets.
Fix probabilities after oversampling, following the math by Guido Deutsch.
TODO: To be verified and extended to multi-class.
Add skeleton for generalized AUC computation.
Implement generalized AUC computation, similar to ConfusionMatrix.
TODO: use percentiles
Clean up AUC computation.
Use AUC in NN.
Tidy up R grammer
Merge branch 'master' of github.com:0xdata/h2o
Add named-column selection Console

Disallow $ in names
When peeking for a char, if allowed to treat \n as whitespace but peek
fails roll back parse-ptr to the 1st newline.  Next layer up of parsing
might not treat \n as whitespace so cannot peek past it.
Missed test bits
more accurate on some corner cases (Summary2)
interesting floor/round tradeoffs. This gets the 1% quantile for 4 cylinders in cars.csv correct (only 4/405=3, so answer is 4)
Fix in variable importance voting.
Merge branch 'master' of github.com:0xdata/h2o
return nothing if a col is empty due to all NAs or other reasons (better than bogus data)? in any case, Summary2 asserted so this prvents the assert. looks okay in browser with all NA (says "Empty column, no summary")
Merge branch 'master' of https://github.com/0xdata/h2o
Refactoring/Cleanup of AUC and prob correction code.
cleaned up the merge of the hcnt2_min/max arrays during the mapreduce. Seemed to have helped the NA issue.