Initial support for Django 1.10 and Python 3

[meredithdutton]

This:

• replaces except Exception, e with except Exception as e for Py3 support
• moves to django.shortcuts.render from render_to_response for Dj1.10 support
• changes the requirement to include Django 1.9 and Django 1.10
• fixes an import to try the Py3 module path
• stops using django.conf.urls.patterns

This should maintain Django 1.8 support (having looked back through the Django docs)

[maiksprenger]

Note that there's @koriaf's fork, and a fork based on that which probably is the best candidate for Python 3 and Django 1.11 support: https://github.com/py-pa/django-oidc

[koriaf]

may be some day someone will be able to merge all these forks to single codebase which works fine for both Pythons. :-)

[vstoykov]

At that day Python 2 will probably EOL and only Python 3+ compatible version would be needed 😉