Django-emailtools-reloaded

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- Tested against Python 3.6.
- Tested against Django 2.0, 2.1 and 2.2.
- Dropping Django 1.6 and 1.7 support.
- Dropping Python 3.4 support.

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Re-branded as `django-email-tools-reloaded`, since original package author
didn't have time to maintain the package and wasn't willing to grant
access to the PyPI.

- Python 3 support.
- Reworked test settings, sorted imports, updated tox for compatibility with
Django 1.8, 1.9, 1.10 and 1.11.
- Drop support for Python 2.6.
- Added wheel support.

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- Bugfix: actually attach attachments
- Bugfix: actually use the headers parameter

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- make ``from_email`` default to ``settings.DEFAULT_FROM_EMAIL``

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- remove ``message`` methog on email callables in favor of direct class instantiation.
- make ``as_callable`` use an subclass of the email message with the overridden
``**kwargs`` calling arguments.

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Initial Release