Clean up cookbook structure

This does a few things:

* Moves default attribute overriding from the default recipe to the attributes file
* Removes unnecessary nil check on `default.deis.public_ip`
* Runs `apt::default` early in the run in the `default` recipe to update package repositories
* Make most recipes include `default`. This is essentially a no-op since we use `deis::controller` directly, but it's good practice - these recipes implicitly depend on what default does anyway, so make it explicit.
* Updates copyright year and company name