Django-countries-with-calling-codes

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* Change rest framework field to be based on ``ChoiceField``.

* Allow for the rest framework field to deserialize by full country name
(specifically the English name for now).

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* Fix for broken CountryField on certain models in Django 1.11.
Thanks aktiur for the test case.

* Update tests to cover Django 1.11

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* Handle "Czechia" translations in a nicer way (fall back to "Czech Republic"
until new translations are available).

* Fix for an import error in Django 1.9+ due to use of non-lazy ``ugettext`` in
the django-countries custom admin filter.

* Back to 100% test coverage.

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* Add sprite flag files (and ``Country.flag_css`` property) to help minimize
HTTP requests.

======================

* Better default Django admin filter when filtering a country field in a
``ModelAdmin``.

* Fix settings to support Django 1.11

* Fix when using a model instance with a deferred country field.

* Allow ``CountryField`` to handle multiple countries at once!

* Allow CountryField to still work if Deferred.

* Fix a field with customized country list. Thanks pilmie!

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* Fix tests for ``COUNTRIES_FIRST_SORT`` (feature still worked, tests didn't).