Linking accounts with an OpenStreetMap account does not work if confirmation is required.

[sim6]

Log in with OpenStreetMap account and log out.
Log in with GitHub account and link it with the previous OpenStreetMap account.

Before #1857 works, but not after commit f963d20

Internal server error, program!

Traceback (most recent call last):
  File "/home/sim6/www.gittip.com/env/local/lib/python2.7/site-packages/algorithm.py", line 288, in run
    new_state = function(**deps.as_kwargs)
  File "/home/sim6/www.gittip.com/env/local/lib/python2.7/site-packages/aspen/algorithms/website.py", line 88, in get_response_for_resource
    return {'response': resource.respond(request)}
  File "/home/sim6/www.gittip.com/env/local/lib/python2.7/site-packages/aspen/resources/dynamic_resource.py", line 52, in respond
    exec self.pages[1] in context
  File "/home/sim6/www.gittip.com/www/on/openstreetmap/associate.spt", line 97, in 
    raise request.resource.respond(request)
  File "/home/sim6/www.gittip.com/env/local/lib/python2.7/site-packages/aspen/resources/dynamic_resource.py", line 52, in respond
    exec self.pages[1] in context
  File "/home/sim6/www.gittip.com/www/on/confirm.html.spt", line 45, in 
    username = account.get_user_name()
AttributeError: 'OpenStreetMapAccount' object has no attribute 'get_user_name'

[chadwhitacre]

I've marked this three stars, regression in the merge w/ #1857, it would seem.