Django-braces

* :support:`30 backported` Tests for all mixins (from rafales).
* :feature:`26 backported` New :ref:`CsrfExemptMixin` for marking views as being CSRF exempt (from jarcoal).
* :support:`- backported` Some documentation updates and a spelling error correction (from shabda).
* :bug:`-` :ref:`SuccessURLRedirectListMixin` raises ``ImproperlyConfigured`` if no ``success_list_url`` attribute is supplied (from kennethlove).

* :bug:`25` Try importing the built-in ``json`` module first, drop back to Django if necessary.
* :support:`- backported` Django 1.5 compatibility.

* :bug:`21 major` Fixed signature of :ref:`UserFormKwargsMixin` ``.get_form_kwargs``
* :feature:`22` Updated :ref:`JSONResponseMixin` to work with non-ASCII characters and other datatypes (such as datetimes)
* :bug:`- major` Fixed all mixins that have ``raise_exception`` as an argument to properly raise a ``PermissionDenied`` exception to allow for custom 403s.