Django-mailer

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* Django 1.10 support.
* Fixed reprs for Message and MessageLog.

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* More helpful admin for Message and MessageLog
* Handle exceptions from really old Django versions

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* Save the ``Message-ID`` header on ``Message`` explicitly to enable finding
emails using this identifier.

This includes a database schema migration.

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* Deprecated calling ``send_mail`` and ``send_html_mail`` using ``priority``
kwargs ``"high"``, ``"medium"``, and ``"low"``. Instead you should use
``PRIORITY_HIGH``, ``PRIORITY_MEDIUM`` and ``PRIORITY_LOW`` from
``mailer.models``.

* Fixed bug with migrations for Django 1.7, which wanted to create a migration
to 'fix' the EmailField length back down to 75 instead of 254.

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* Included migrations - for both South and Django 1.7 native migrations.

Note:

* If you use South, you will need at least South 1.0
* You will need to use '--fake' or '--fake-initial' on existing installations.

These migrations were supposed to be in 1.0.0 but were omitted due to a
packaging error.

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* Throttling of email sending
* Django 1.8 support
* Admin tweaks and improvements
* Various other fixes, especially from Renato Alves <alves.rjcgmail.com> - thank you!