Traceback (most recent call last):
  File "api.py", line 56, in <module>
    maas_access.post(u"users/", "new", **data)
  File "/usr/lib/python2.7/dist-packages/apiclient/maas_client.py", line 248, in post
    path, kwargs, as_json=as_json)
  File "/usr/lib/python2.7/dist-packages/apiclient/maas_client.py", line 222, in _formulate_change
    body, headers = encode_multipart_data(params, {})
  File "/usr/lib/python2.7/dist-packages/apiclient/multipart.py", line 156, in encode_multipart_data
    message = build_multipart_message(chain(data, files))
  File "/usr/lib/python2.7/dist-packages/apiclient/multipart.py", line 110, in build_multipart_message
    for payload in make_payloads(name, content):
  File "/usr/lib/python2.7/dist-packages/apiclient/multipart.py", line 104, in make_payloads
    "%r is unrecognised: %r" % (name, content))
AssertionError: u'is_superuser' is unrecognised: 0