Unit tests

[cjoudrey]

Possibly using Vows?

[timlind]

I haven't done any automated assertion testing yet. I prefer to do tests through practical examples that are designed to take into account the units and what they are meant to do. So I'll probably change the examples a bit for that. There's still quite a bit of modifying that I want to get done to extend the functionality first though. Feel free to have at it though.