Colby: Small Wrapper and Functions for Persistent, Immutable Data

Today, I cleaned up an earlier project I'd left hanging around called
Colby. It's a little wrapper around the data structures that the Hamster gem provides, and it adds some functions to make working with
those data structures a little similar to the Clojure-way.

At this point, Colby is very experimental and is only at a 0.0.1
release to reflect its brittleness. However, all specs pass currently
and it's useable as-is. I've pushed the initial release to RubyGems,
so you can start using Colby by just doing gem install colby.

Comments welcome! I realize this may be a bit simple compared to
rouge, which is an awesome project, but I'll keep this around for my own edification.