mediagoblin/media_types/blog/views.py has an undefined reference to WARNING.

Adding a comment with a non-ASCII character results in a server error when sending a notification email. Running py2 with close-to-latest master code. Eg, trying to add something like "テストコメントです！" results in the error below.

2016-03-28 20:45:19,114 INFO    [mediagoblin.notifications.task] Sending notification email about <Notification #7: <LocalUser #13 verified user "ayleph">: None (unseen)>
===== Email =====
From address: mediagoblin@goblinrefuge.com
To addresses: ayleph@thisshitistemp.com
Subject: Goblin Refuge Beta - machalus commented on your post
-- Body: --
Error - <type 'exceptions.UnicodeEncodeError'>: 'ascii' codec can't encode characters in position 130-139: ordinal not in range(128)
URL: http://pumpdev.goblinrefuge.com/u/ayleph/m/43/comment/add/
File '/path/to/mediagoblin/lib/python2.7/site-packages/Paste-1.7.5.1-py2.7.egg/paste/exceptions/errormiddleware.py', line 144 in __call__
  app_iter = self.application(environ, sr_checker)
File '/path/to/mediagoblin/mediagoblin/app.py', line 342 in __call__
  return self.call_backend(environ, start_response)
File '/path/to/mediagoblin/lib/python2.7/site-packages/Werkzeug-0.9.6-py2.7.egg/werkzeug/wsgi.py', line 588 in __call__
  return self.app(environ, start_response)
File '/path/to/mediagoblin/mediagoblin/app.py', line 276 in call_backend
  return self._finish_call_backend(request, environ, start_response)
File '/path/to/mediagoblin/mediagoblin/app.py', line 318 in _finish_call_backend
  response = controller(request)
File '/path/to/mediagoblin/mediagoblin/decorators.py', line 281 in wrapper
  return controller(request, media=media, *args, **kwargs)
File '/path/to/mediagoblin/mediagoblin/decorators.py', line 47 in wrapper
  return controller(request, *args, **kwargs)
File '/path/to/mediagoblin/mediagoblin/decorators.py', line 74 in new_controller_func
  return controller(request, *args, **kwargs)
File '/path/to/mediagoblin/mediagoblin/decorators.py', line 103 in wrapper
  return controller(request, *args, **kwargs)
File '/path/to/mediagoblin/mediagoblin/user_pages/views.py', line 210 in media_post_comment
  trigger_notification(link, media, request)
File '/path/to/mediagoblin/mediagoblin/notifications/__init__.py', line 63 in trigger_notification
  email_notification_task.apply_async([cn.id, message])
File '/path/to/mediagoblin/lib/python2.7/site-packages/celery-3.1.20-py2.7.egg/celery/app/task.py', line 557 in apply_async
  link=link, link_error=link_error, **options)
File '/path/to/mediagoblin/lib/python2.7/site-packages/celery-3.1.20-py2.7.egg/celery/app/task.py', line 755 in apply
  request=request, propagate=throw)
File '/path/to/mediagoblin/lib/python2.7/site-packages/celery-3.1.20-py2.7.egg/celery/app/trace.py', line 355 in eager_trace_task
  uuid, args, kwargs, request)
File '/path/to/mediagoblin/lib/python2.7/site-packages/celery-3.1.20-py2.7.egg/celery/app/trace.py', line 253 in trace_task
  I, R, state, retval = on_error(task_request, exc, uuid)
File '/path/to/mediagoblin/lib/python2.7/site-packages/celery-3.1.20-py2.7.egg/celery/app/trace.py', line 240 in trace_task
  R = retval = fun(*args, **kwargs)
File '/path/to/mediagoblin/mediagoblin/notifications/task.py', line 44 in run
  message['body'])
File '/path/to/mediagoblin/mediagoblin/tools/mail.py', line 140 in send_email
  print(message_body)
File '/path/to/mediagoblin/lib/python2.7/site-packages/PasteScript-1.7.5-py2.7.egg/paste/script/serve.py', line 530 in write
  fileobj.write(text)
UnicodeEncodeError: 'ascii' codec can't encode characters in position 130-139: ordinal not in range(128)

Notably, some cruft from the mongodb days (and the transition from which) are still around. We don't need models_v0.py and stuff.

Look for this stuff and tear it out!