django/django — pull request #1232 by gavinwahl (2013-05-29 22:20:46+00:00)
Title: Don't hard-code class names when calling static methods

`UserManager.normalize_email` should be called on the instance, not the class. This has the same effect normally but is more helpful to subclassers. When methods are called directly on the class, subclasses can't override them.