fix unpleasant binning caused by numeric error

A plain division of value offset by step size could assign a value to
'wrong' bin. E.G., floor(0.15 / 0.05) = floor(2.9999...6) = 2.

We now round the quotient to certain precision digits so as to
tolerate the numeric error and make the binning more in favor of human
interpretation.
Merge branch 'master' into summary2
Updated Compression to only use floats if completely lossless (which pretty much means don not use floats).
Merge branch 'master' of github.com:0xdata/h2o
shorten some tests (time). test_GBM_manyfiles_train_test.py fails with ignore_cols_by_name random choices
Merge branch 'master' of github.com:0xdata/h2o
params forced to be static. https://0xdata.atlassian.net/browse/HEX-120'0
Added C4SChunk to support loss-less compression of float-like numbers (e.g. 1723.35).
Merge branch 'master' of github.com:0xdata/h2o
Updated NewChunk compression to completely ignore floats (never used anyways, float conversion is almost always lossy).
shorten the KMeans test. move the GBM airlines into the 164 jenkins release tests
update archiving, turn off extra logging
Merge branch 'master' of https://github.com/0xdata/h2o
remove a little printing for cloned clouds
Merge branch 'master' of github.com:0xdata/h2o
limit grid search to 10 points; h2o_import typo fix
Merge branch 'master' of https://github.com/0xdata/h2o
Updated VectorGroup to have it's own type not to clash with VECs.
Merge branch 'master' of github.com:0xdata/h2o
Edited example code