Remove URL.js usage

[clancychilds]

As of version 0.0.1, there is a dependency on https://nodejs.org/api/url.html. It only uses bits of the parsing library which can probably be done much quicker with some regex-fu. The URL.js requirement adds a lot of bloat to the minified version (I think about 66% of the file!), so it would be great to get that down.