Django-email-confirm-la

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- Support automatically login after email confirmation via `EMAIL_CONFIRM_LA_AUTOLOGIN` setting
- Use `uuid.uuid4()` to generate confirmation key

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- Fix migration dependencies
- New parameter ``old_email`` in `post_email_confirmation_confirm` signal

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- Reset migration
- Fix ``EmailConfirmationValidator``

- Full refactoring
- Drop support for Django 1.4

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- Fix `14 <https://github.com/vinta/django-email-confirm-la/issues/14>`_ Admin raises an `AttributeError` when `content_object` doesn't exist

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- New admin action: Re-send confirmation email
- New setting: ``EMAIL_CONFIRM_LA_EMAIL_BACKEND``
- Change ``EMAIL_CONFIRM_LA_DOMAIN`` default value to ``''``, fail fast
- Fix circular import