Wagtailtrans

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- Add support for ``Wagtail 1.11``
- Update language selector templatetag to work with pages without language as well
- Update language selector to order language selector based on language positions

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- Add ``include_self=False`` kwarg to ``TranslatablePage.get_translations()`` to have the page return itself as well
- Add language selector template tags
- Update ``Language`` management to make use of ``wagtail.contrib.modeladmin``
- Update ``Tox`` and ``Travis`` test matrix to include ``Wagtail 1.10`` support

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This release drops support for wagtail 1.6 and adds support for wagtail 1.8 and 1.9

- Add new ``wagtailtrans`` logo.
- Add admin view for translating with ``WAGTAILTRANS_SYNC_TREE = False``, prevents issues with not having a ``_meta`` on the ``TranslationForm``.
- Update ``TranslationMiddleware`` to also use the ``Accept-Language`` HTTP header
- Fix: Update middleware to prevent errors on empty database
- Fix: backwards compatibility with Django 1.8 for ``wagtailtrans.templatetags``

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- Add ``TranslationMiddleware`` for earlier language activation (replaces django ``LocaleMiddleware``)
- Add ``language_id`` filter to ``wagtailtrans.models.TranslatablePage`` so search results can be filtered by language
- Update documentation

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- Implement models following `Wagtail RFC9 <https://github.com/takeflight/wagtail-rfcs/blob/0008-translations/draft/0009-translations.rst>`_ by Tim Heap
- Force language of child pages to language of parent
- Support storing of translated pages
- Support copying content of canonical pages when creating translations

- Add translation information to the ``TranslatablePage.settings_panels``
- Add dropdown page menu for adding translations
- Add Language admin-UI in settings-menu
- Add ``WAGTAILTRANS_SYNC_TREE`` setting to control which way trees behave
- Add ``WAGTAILTRANS_TEMPLATE_DIR`` to override the admin template dir (pre Wagtail 1.8)
- Add ``WAGTAILTRANS_LANGUAGES_PER_SITE`` setting to allow different page languages per site
- Add SiteLanguages as SiteSetting in settings-menu (``WAGTAILTRANS_LANGUAGES_PER_SITE``)
- Add ``wagtailtrans.models.TranslatablePage.get_admin_display_title`` to display the page language in the admin explorer (Wagtail 1.8+)