python-yadis dependency

[tuxcanfly]

python-yadis (http://pypi.python.org/simple/python-yadis/) is a part of python-openid 2.0.0. So it is no longer an external dependency.

Fixed in my branch at:
http://github.com/tuxcanfly/Django-Socialauth/commit/c1cc044040728751fab8952921f703515ca7a296

[tuxcanfly]

Thanks ad05226