Implement basic user authentication

Added the app "authentication", that uses Django's generic views to
provide user login and logout.
Implement object level permissions for decks

The module "guardian" is added to the requirements to acheive object
level permissions for decks.
Initial commit
Add docs build folder to gitignore
Replace author string
Edit conf.py to make autodoc work with django
Expanded test
Fix readthedocs support
Add documentation skeleton with example code
Fix style error
Add static path to docstring conf
Add sphinx and napoleon to requirements.txt
Require login for deck operations