Better caching, more slice smarts

Do DeepSlice rollups BEFORE the MR job.
Better handling printing Frames with no names.
Missed index
Bump master to 2.5.
was the OutWrapper thing redundant in build_cloud_with_hosts? it's in build_cloud()

changed tree counts in rf_covtype20x_fvec (which is only doing covtype)
still have to adapt test_rf_predict_fvec.py to the new predict output for fvec (percent, not just class result?)
always run 50 files. also h2e (h2o_exec) import was missing
Merge branch 'master' of github.com:0xdata/h2o
typo
use column number for exec
C1 not C0
don't run the c2/c3 fvec tests
Don't stop when hitting 0% classification error on training set for MNIST.
Fix pop empty scope

Weaver knows about com.oxdata.math
Merge branch 'master' into cliffc-scope
Scope nuke frames correctly
DRF test polishment.
edits to docs
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Updated RebalanceDataset. Added Vec.makeZeros() call to make multiple zero vecs at the same time.
Merge branch 'master' of github.com:0xdata/h2o
minor mods to docs
added test of silent regularization to goldens