Remove unused core app admin.py
Use Django 1.6 and South

This seems like a better choice because 1.7 is
still in active development and third party apps
might not have support for it yet, limiting our
choices. In the near future when 1.7 is out
you will be able to upgrade from South.
Add default admin user fixture for development
Add instructions to use admin site in development
Merge pull request #6 from jpadilla/master

Downgrade to Django 1.6 with South