Mid hack compressing out zeros
Merge branch 'master' of github.com:0xdata/h2o
Compress most non-primitive array types

RLE for any embedded nulls & the array length
Merge branch 'master' into cliffc-gbm5
Fix MRTask2 bug calling reduce extra time

Tiny dataset, on a 3+ cluster to trigger it
Reenable FVecTest
remove some debug prints
Further compression of Long arrays (but not int)

Look at long arrays before wire-shipping.  Ship as bytes, shorts or ints
if the values all fit in a smaller form-factor.  Appears to reduce the
i/o size during a deep GBM/DRF histogram shipping to 1/4th.
Merge branch 'master' of github.com:0xdata/h2o