Removed download commands
Removed download commands

The list of commands to download H2O on Hadoop was out of date.
Replaced this with a link to the Download page, which always includes
the most up-to-date commands.

h2oai/h2o-dev,h2oai/h2o-3,spennihana/h2o-3,spennihana/h2o-3,spennihana/h2o-3,michalkurka/h2o-3,jangorecki/h2o-3,h2oai/h2o-dev,h2oai/h2o-3,mathemage/h2o-3,h2oai/h2o-3,michalkurka/h2o-3,michalkurka/h2o-3,spennihana/h2o-3,h2oai/h2o-dev,mathemage/h2o-3,h2oai/h2o-3,h2oai/h2o-dev,mathemage/h2o-3,michalkurka/h2o-3,h2oai/h2o-3,jangorecki/h2o-3,michalkurka/h2o-3,spennihana/h2o-3,h2oai/h2o-3,mathemage/h2o-3,mathemage/h2o-3,mathemage/h2o-3,mathemage/h2o-3,h2oai/h2o-dev,michalkurka/h2o-3,h2oai/h2o-dev,h2oai/h2o-3,h2oai/h2o-3,jangorecki/h2o-3,spennihana/h2o-3,h2oai/h2o-dev,spennihana/h2o-3,jangorecki/h2o-3,jangorecki/h2o-3,jangorecki/h2o-3,jangorecki/h2o-3,michalkurka/h2o-3