Cucumber tests & option to pick from ruby-1.9.3 / ruby-1.8.7 / jruby

CapHub is awesome.
However, there were two things bugging me:

1.) There are no tests and this is version 0.0.1. That made my boss go "Mmmmhhhhhhhhhhhhh really?". Now there are tests. Even if you don't like the stuff I did for reason (2.), please tell me and I will split the pull requests, because I think tests really make sense and should be maintained.

2.) We have lazy developers. God, even I am lazy. I like the most comfort I could get.
Seeing that I sometimes have to deal with JRuby, Ruby 1.9 and less and less with Ruby 1.8 projects I have to set up, I added a flag specifying the ruby version that should be in the .rvmrc, so I can get started riiight awaaay!