Update Mnist expert example code.
Add helper for maxValue of double[].
Merge branch 'master' of https://github.com/0xdata/h2o
Revert fix, pending resolution of PUB-519.
Modify logic for testing whether adaptive rate is used or not.
Update Drednet examples.
Simplify fprop + bprop code, introduce a mat-vec helper.

Speedup bprop by not checking for Inf.
Merge branch 'master' of https://github.com/0xdata/h2o
Add fast_mode to NeuralNet and update JUnit tests.
Don't fuss in AUC if all predictions are 0 or 1 (since isInt() is true in that case)
Replace missing columns with 0s during adapt() to handle mismatching train/test sets for sparse data.