Close #9

I fixed this, was kind of a simple fix but I am unsure if we want to submit a bug report to rubinius. Not sure they should check for either symbol or string or if ruby MRI is supporting stuff the specification doesn't say it should.

First of all the assert_match should be case insensitive for the private constant. Second we need to use a symbol when creating the constant. I'll let the specs run and see what happens.