More robust with appropriate libraries

• Using megaparsec now, some bugs have been automatically fixed by replacing my naive implementation
• Using haskeline, so anything you would get from gnu readline, you got it!
• Setup basic testing with hspec

Very minimal Haskell rewrite

Now in Haskell. Also starting to give a more Clojure feel to the syntax.

Just releasing so I can bug people to play with it

There's not much code I've written just yet, most of it was just a step-by-step reproduction of the metacircular evaluator from SICP. (Not even a complete reproduction yet, though)
If anyone knows if there's any kind of legal issue with GPL'ing this, please let me know.