Drop bpz namespace (fixes #32)

This fixes codefortulsa/BPZAround.me#32 .  Django REST Framework can't deal with namespaces (see [stackoverflow](http://stackoverflow.com/questions/19612398/how-to-add-namespace-url-to-a-django-rest-framework-router-viewset), [long discussion in pull request](https://github.com/tomchristie/django-rest-framework/pull/1143)).

I nominate @groovecoder for code review.