So it looks like the pusher addon on heroku gives us `PUSHER_URL` which the `pusher` gem [uses](https://github.com/pusher/pusher-gem/blob/master/lib/pusher.rb#L53) to set the key, secret, and app id. Anyway we could switch to expecting a `PUSHER_URL` in the `.env`? That way it would make both production and development pull in configuration the same way.

Once that change is made we wont need an initializer at all, which is kinda nice.