Let there be PG everywhere
Create a simple User model and serializer
User controller

…serve up all of our users to our Ember app
The Routes

A few things are happening here:

* We are constraining against the format with a custom `FormatTest`
class. We only want to map certain routes to `JSON` requests and
certain routes to `HTML` requesets.
* The `get '*foo'...` will greedily match all routes except `/` so we
have the following line. For now, we want to direct all `HTML` requests
to a single `controller#action`.