@dzucconi (cc @dblock): Using a HAL fetcher lib to create models and such

I wrote a wrapper library around [Traverson](https://github.com/basti1302/traverson) that allows you to crawl the HAL links & create Backbone models/collections via a `spooky.new Sections, 'articles[0].sections', (err, sections) ->` interface. It also parses out the _links and _embedded stuff before instantiating the models/collections removing the need for the base collections. For now I've dropped sections and other models to keep things simple.

Still plenty of TODOs, the library is sparse on tests and auth is a big unknown right now. Regardless this gets things wired up.
This just avoids having to write a base model or parse function that excludes the HAL _links _embedded stuff, which I think is a nice thing to keep out of our models.