Update require and package.json dependencies

I'm pretty sure the existing implementation wouldn't work unless the dependencies were manually placed in `node_modules`. Anyway, this uses wolfy87's published `eventEmitter` on npm and (temporarily) my fork of eventie with a proper package.json. Would be happy to swap it out for yours if [eventie#3](https://github.com/desandro/eventie/pull/3) gets merged :D