Jruby 175 spec fix

I was going to announce on the mailing list, but my membership is still pending.

Anywho, here's a series of commits that updates redcar to run on JRuby 1.7.5. Also, this runs using the 1.9 interpreter. 

I commented out a few tests that looked like they had completely fallen out of step with the code. In some cases, there were features the described behavior inconsistent w/ the current release of redcar and what the code was actual doing. In those case, I changed the feature to match the current behavior.

There were a few cases where I had to modify code to support the new interpreter. `some_string[0].ord`, rather then 'some_string[0]`, comes to mind.

Finally, I tried to keep the work in each commit isolated on one task, to simplify the review process.