Cucumber rails2 v0.3.3

This enables support for capybara 1.1.x and rails 2.3. I'm still forced to use rails 2 :(.
This is not intended for master. It's based on v0.3.2. Don't know how to pull request into a separate branch.
This is a backport of #130 and 68044f45fdfd0f7c1006699be9a15f11fbed2ac1, and a fix for #110