Some code changes; some help still needed from Amy & Tomas
Tutorial and Vignette updates.
Merge branch 'master' of https://github.com/0xdata/h2o
Merge branch 'master' of https://github.com/0xdata/h2o
Revised per Amy's markup; please review changes to the following sections: 3.2, 3.3, 4, 5.1, 5.2, 5.3, 6, 7.1, 7.12
Merge branch 'master' of https://github.com/h2oai/h2o
Proofreading changes
Updated github links
Updated links & PDFs
Updated matrix mul, added few R calls:
   1)removeVecs to let R drop frame columns without invoking slice operator (no copy, just remove the vecs from the frame and from KV)
    2)Order - get indexes of n smallest (largest) elements in the frame and output result as a new frame)
commented out sparse-multiply test
removed matrix test datasets.
Removed copies of test datasets.
Merge branch 'master' of github.com:0xdata/h2o
Added person.
Rollbacking H2O World banner on front page.
Revert "H2O World banner on H2O page."

This reverts commit d00991da61d27f39691b3c7f3a3761e82a67a7fa.
Learn h2o on front page.
fix double printing in dl
mention bernoulli distro in docs