There's an issue with using that change:

```
Traceback (most recent call last):
  File "/Users/bacongobbler/git/src/github.com/deis/deis/controller/api/tests/test_release.py", line 198, in test_release_summary
    release3 = self.test_release()
  File "/Users/bacongobbler/git/src/github.com/deis/deis/controller/api/tests/test_release.py", line 47, in test_release
    url, json.dumps(body), content_type='application/json')
  File "/Users/bacongobbler/venv/lib/python2.7/site-packages/django/test/client.py", line 483, in post
    response = super(Client, self).post(path, data=data, content_type=content_type, **extra)
  File "/Users/bacongobbler/venv/lib/python2.7/site-packages/django/test/client.py", line 302, in post
    return self.request(**r)
  File "/Users/bacongobbler/venv/lib/python2.7/site-packages/django/test/client.py", line 444, in request
    six.reraise(*exc_info)
  File "/Users/bacongobbler/venv/lib/python2.7/site-packages/django/core/handlers/base.py", line 114, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/Users/bacongobbler/venv/lib/python2.7/site-packages/rest_framework/viewsets.py", line 78, in view
    return self.dispatch(request, *args, **kwargs)
  File "/Users/bacongobbler/venv/lib/python2.7/site-packages/django/views/decorators/csrf.py", line 57, in wrapped_view
    return view_func(*args, **kwargs)
  File "/Users/bacongobbler/venv/lib/python2.7/site-packages/rest_framework/views.py", line 399, in dispatch
    response = self.handle_exception(exc)
  File "/Users/bacongobbler/venv/lib/python2.7/site-packages/rest_framework/views.py", line 396, in dispatch
    response = handler(request, *args, **kwargs)
  File "/Users/bacongobbler/git/src/github.com/deis/deis/controller/api/views.py", line 402, in create
    return super(AppConfigViewSet, self).create(request, *args, **kwargs)
  File "/Users/bacongobbler/venv/lib/python2.7/site-packages/rest_framework/mixins.py", line 55, in create
    self.post_save(self.object, created=True)
  File "/Users/bacongobbler/git/src/github.com/deis/deis/controller/api/views.py", line 383, in post_save
    config.app.deploy(self.release)
  File "/Users/bacongobbler/git/src/github.com/deis/deis/controller/api/models.py", line 135, in deploy
    self.scale()
  File "/Users/bacongobbler/git/src/github.com/deis/deis/controller/api/models.py", line 149, in scale
    results = self.container_set.filter(type=container_type).aggregate(max('num'))
  File "/Users/bacongobbler/venv/lib/python2.7/site-packages/django/db/models/query.py", line 270, in aggregate
    kwargs[arg.default_alias] = arg
AttributeError: 'unicode' object has no attribute 'default_alias'
```