edgecase/ruby_koans — pull request #84 by wyaeld (2013-02-25 03:35:50+00:00)
Title: Ensure RubyKoans works under Ruby 2.0

There are a several if_ruby_version checks in the edgecase.rb that don't check for 2.0, and the AssertionError definition needs to happen, so this is a tiny pull to address that. Otherwise you just get the following:
```
ruby_koans/koans/edgecase.rb:399:in `rescue in meditate': uninitialized constant EdgeCase::Sensei::AssertionError (NameError)
```