Steam backend not using stateless mode

[redlulz]

Logging in with Steam and the Django app prints an exception to the Django console:

ERROR:root:Missing required parameter in response from https://steamcommunity.com/openid/login: ('http://specs.openid.net/auth/2.0', 'assoc_type')
Traceback (most recent call last):
  File "~/py3VirtualEnv/local/lib/python3.3/dist-packages/openid/message.py", line 455, in getArg
    return self.args[args_key]
KeyError: ('http://specs.openid.net/auth/2.0', 'assoc_type')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "~/py3VirtualEnv/local/lib/python3.3/dist-packages/openid/consumer/consumer.py", line 1280, in _requestAssociation
    assoc = self._extractAssociation(response, assoc_session)
  File "~/py3VirtualEnv/local/lib/python3.3/dist-packages/openid/consumer/consumer.py", line 1397, in _extractAssociation
    OPENID_NS, 'assoc_type', no_default)
  File "~/py3VirtualEnv/local/lib/python3.3/dist-packages/openid/message.py", line 458, in getArg
    raise KeyError((namespace, key))
KeyError: ('http://specs.openid.net/auth/2.0', 'assoc_type')

Using stateless mode makes the exception go away. This should probably be the default for the Steam backend.

[omab]

I've pushed a fix for this, thanks for the report.