Feincms3

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- Removed all dependencies from ``install_requires`` to make it easier
to replace individual items.
- Enabled the use of ``i18n_patterns`` in ``ROOT_URLCONF`` by importing
and adding the urlpatterns contained instead of ``include()``-ing the
module in ``apps_urlconf``.
- Modified the cleansing configuration to allow empty ``<a>`` tags
(mostly useful for internal anchors).
- Fixed crash when adding a page with a path that exists already (when
not using a statich path).

~~~~~~~~~~~~~~~~~~~

- Updated the translation files.
- Fixed crashes when path of pages would not be unique when moving
subtrees.

~~~~~~~~~~~~~~~~~~~

- Fixed a crash where apps without ``required_fields`` could not be
saved.
- Added a template snippet based renderer for plugins.
- Prevented adding the exact same application (that is, the same
``app_instance_namespace``) more than once.

~~~~~~~~~~~~~~~~~~~

- Made application instances (``feincms3.apps``) more flexible by
allowing programmatically generated instance namespace specifiers.

~~~~~~~~~~~~~~~~~~~

- Lots of work on the documentation.
- Moved all signal receivers into their classes as staticmethods.
- Fixed a crash on an attempted save of an ``External`` plugin instance
with an empty URL.
- Added an incomplete testsuite, and add the Travis CI badge to the README.
- Removed the requirement of passing a context to ``render_list`` and
``render_detail``.

~~~~~~~~~~~~~~~~~~~

- The external plugin admin form now checks whether the URL can be
embedded using OEmbed or not.
- Added the ``plugin_ckeditor.js`` file required for the rich text
editor.
- Added a ``SnippetInline`` for consistency.
- Ensured that choice fields have a ``get_*_display`` method by setting
dummy choices in advance (menus, snippets and templates).
- Added automatically built documentation on
`readthedocs.io <http://feincms3.readthedocs.io/>`_.