Updated settings file to only allow beta host for staging, updated local env
version change

Module [django-storages-py3k]:
  * __init__.py
Move `/S3.py` to `/storages/utils/S3.py`

This makes it possible to directly import the `S3.py` utility module
when django-storages is installed as pip-package, e.g.
`from storages.utils.S3 import CallingFormat`.