Django-phonenumber-field

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* Removed hardcoded dependency to phonenumbers library. Now developers have to
manually install either phonenumbers or phonenumberslite.
* Added Romanian locale
* Added Bangla locale
* Update French locale
* Update Italian locale

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* Statically depend on phonenumbers
Previously the phonenumberslight dependency was used dynamically in setup.py
if it already was installed, causing problems with building wheels and
with pipenv.
* Added Ukrainian locale
* Added Simplified Chinese locale

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* Add Django 2.0 support
* Drop Support for Django<1.11
* Translations: Swedish

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* Add rest_framework Serializer
* Hashable phonenumber object
* Various bugfixes and improvements

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* Django 1.10 support
* Bugfixes and cleanup
* Translations: Brazilian Portuguese, Spanish, Norwegian, Dutch, Azerbaijani, Turkish and French

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* Django 1.9 support
* README updated and links fixed
* support for HTML5.0 tel input type added
* locale files are now included
* new translations: Danish, Esperanto, Polish, all translations reformatted, Russian translation expanded
* PhoneNumberField.get_prep_value changed to enable setting ``null=True``
* new widget added: ``PhoneNumberInternationalFallbackWidget``
* new backward compatible requirement phonenumberslite instead of phonenumbers
* lots of tests
* dropped support for ``PHONENUMER_DEFAULT_REGION`` setting with typo