Form-designer

---

* The form admin uses django-admin-ordering_ for fields if available.
* Now supports sending notification mails to multiple addresses.

---

* Moved the ``FormContent`` to the new module ``form_designer.contents``
to make the form designer usable without FeinCMS_.
* Replaced ``SortedDict`` with ``collections.OrderedDict``.
* Fixed an XSS vulnerability in the administration.
* Dropped compatibility with old Django versions (<1.8).
* Replaced the horrible form submission serialization of ``repr()`` and
``eval()`` with JSON.
* General packaging and code cleanups.

---

* Avoid the deprecated ``mimetype`` argument to HTTP responses.
* Fixed infinite recursion in ``jsonize``.
* Made field type choices lazy so that changing available field types is
easier resp. actually possible.

---

* Improve code coverage, less warnings, less complaining.

---

* Added an app config for a nicer app name.

---

* Built-in support for Django 1.7-style migrations. If you're using South,
update to South 1.0 or better.