Add plug to Iroh and a sample crawler

The crawler is a headless browser; PhantomJS. It's a hell to use, but it runs javascript, which might come in handy if we want to do something with those buttons. 

I'm using [phridge](https://github.com/peerigon/phridge) because it allows for 'native' PhantomJS javascript. Phantom doesn't run on node; is a whole other process, project and architecture. phridge is one of many bridges.

IMO Phantom is the way to go. Have a look and check it out.