Kinda like a hosted Hadoop cluster.

RubyMine is very nice, but I think that I would avoid it during learning stages. It adds a lot of complexity, like most IDEs do, which can cause you to spend a lot of your time at the beginning learning the IDE rather than learning the language (Ruby) or the framework (Rails.)

I gave up, at least for the moment, and just went with the production Rails 4.1.6 version which went in without a problem.

Cool, thanks for the heads up.