Readonly api finished

After way too much time, I've finally got the API working. This one requires the latest version of Django REST Framework so make sure you're up to date.

Also, if you want to explore the API or do more in-depth testing in a friendlier way, you can put this in your `settings/local.py` and it will let you visit an HTML UI at `/api/v1/` without needing to pass an authentication header:

    REST_FRAMEWORK = {
        'PAGINATE_BY': 25,
        'DEFAULT_FILTER_BACKENDS': (
            'cyder.api.v1.filter.SearchFieldFilter',
        )
    }