PUB-784: Resolve merge conflicts, WIP toward sparsity constraints.
Merge branch 'arno-deeplearning2' of https://github.com/0xdata/h2o into arno-deeplearning2
PUB-603: Working example of bias-driven sparse auto-encoder.
Merge branch 'master' into arno-deeplearning2

Conflicts:
	src/test/java/water/JUnitRunnerDebug.java