Feature/integrate open id authentication #14

Created by: ghost

• Login with google oauth
• Some cleanup
• Circular dependencies resolved with the urls.py

Warning: Login in Settings with oauth for testing purposes only and localhost only!

Tested Application:

./manage.py check
./manage.py test

Application manually Tested:

• login through google oauth
• get permission denied for views
• add rights as admin to user
• access views with permissions

@das-g & @wasabideveloper please review