Rails REPL

Not sure if this is desirable, since Rails isn't a programming language...

Wanted to be able to use this with the rails environment loaded so I quickly put together something to run a `rails console` repl. Tested on OSX with Rails 3.2 and works fine. It uses pry and is basically just a mix of the existing Ruby REPL + rails environment.

It doesn't have send line support - tried to get it working but gave up.