Django-superform

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* Fix formset rendering in Django 1.9. `17`_
* Add support for Django 1.9's ``get_bound_field``. `18`_

.. _17: https://github.com/gregmuellegger/django-superform/pull/17
.. _18: https://github.com/gregmuellegger/django-superform/pull/18

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* ``SuperForm.composite_fields`` dict is not longer shared between form
instances. Every new form instances get's a deep copy. So changes to it
won't leak into other instances of the same form class.

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* `11`_: Fix ``CompositeBoundField`` to allow direct access to nested form
fields via ``form['nested_form']['field']``.
* Support for Django's Media handling in nested forms. See `3`_ and `5`_.
* Do not populate errorlist representations without any errors of nested
formsets into the errors of the super form. See `5`_ for details.

.. _3: https://github.com/gregmuellegger/django-superform/issues/3
.. _5: https://github.com/gregmuellegger/django-superform/pull/5
.. _11: https://github.com/gregmuellegger/django-superform/issues/11

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* Django 1.8 support.
* Initial values given to the ``__init__`` method of the super-form will get
passed through to the nested forms.
* The ``empty_permitted`` argument for modelforms used in a ``ModelFormField``
is set depending on the ``required`` attribute given to the field.

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* Initial release with proof of concept.