AbstractEmailUser does not normalize emails

[weslord]

I noticed that AbstractEmailUser does not reproduce the .clean() method that Django's AbstractUser provides, which means normalize_email() (lowercasify the domain portion) is not being invoked on save.

https://github.com/django/django/blob/master/django/contrib/auth/models.py#L363-L365:

    def clean(self):
        super().clean()
        self.email = self.__class__.objects.normalize_email(self.email)

I would assume that this is deliberate, but authtools' implementation of UserManager.create_user() does include normalize_email()

https://github.com/fusionbox/django-authtools/blob/master/authtools/models.py#L12-L17

    def create_user(self, email, password=None, **kwargs):
        email = self.normalize_email(email)
        // ...

Which means that users created with manage.py createsuperuserwill have their emails normalized, but users created through the Django Admin will not.

[weslord]

I've submitted a pull request with a fix, on the assumption that calling Django's normalize_email() everywhere is the preferred outcome, and does not conflict with approaches discussed in #11

[bgaudino]

Fixed in #110