users: add extra checks on editing the default user There is no need to be able to edit e-mails or permissions of the default user, so add the same checks as present in many other methods in the users controller.

[tox]
envlist = py{26,27}-{pytest,nose}

[testenv]
setenv =
    PYTHONHASHSEED = 0
deps =
    nose: nose
    pytest: pytest
commands =
    nose: nosetests {posargs}
    pytest: py.test {posargs}