Django-stagesetting

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* Minor changes to allow for easy subclassing or replacement of the middleware,
context processor etc.
* Updated test matrix to cover more versions of Django (1.9+)

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* Admin now displays pretty names for the setting keys.
* ``StaticFilesChoiceField`` and ``DefaultStorageFilesChoiceField`` now both use an
LRU cache to avoid having to enumerate the storage backends/finders repeatedly.

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* When generating a form from an ``OrderedDict``, field ordering is now preserved.
* When a form's values are saved into the database and become stale (because the
underlying form/defaults are added to), the new defaults are transparently
mapped onto the value when it's made available via the middleware,
context processor or template tag.

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* Introduced the ``stagesetting`` template tag.
* Settings are no longer automatically created on app ``ready()``, instead
the defaults are lazily converted when requested via a ``RuntimeSettingWrapper``
* Added ``StaticFilesChoiceField`` and ``DefaultStorageFilesChoiceField``,
which allow for selecting a file that already exists in the given storage.
* When auto-generating a form, the ``STATIC_URL`` and ``MEDIA_URL`` settings
are treated as special, and turned into the aforementioned fields.
* Providing an incomplete defaults dictionary in the second parameter of a
given setting's config will now show *Info* messages to indicate what's
missing.
* When auto-generating a form from a dictionary, HTML-like values will try
to use one of `django-ckeditor`_, `django-tinymce`_, `django-markdown`_,
`django-pagedown`_, or `django-epiceditor`_ for a widget instead of a normal
``textarea``.
* Added support for using `django-bleach`_ when encountering HTML-like values
in an autogenerated form.
* Added initial support for `djangorestframework`_

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* Fixed error introduced in ``0.3.1`` when only providing a dictionary, because
it turns out it wasn't being covered by tests.

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* Fixed issue where providing a dictionary wasn't treating the values as
implicit defaults to be created into the database.