Add support for RequireJS

[cblair]

I know this repo is called node-oauth, but its probably not hard to make it compatible with RequireJS and then you could change the name to oauth and take over the world. How hard can it be?

I've started this at https://github.com/cblair/node-oauth, I'll finish and start a PR or give up if I find an easier RequireJS oauth solution.

Thanks!

[cblair]

Things went swimmingly until hitting require('crypto'). At this point, I'm not converting and using the best alternative to that node.js library (crypto-js I think).

Running away for now.