Django-post-office

-------------
* Adds Django 1.8 compatibility.

-------------
* Fixes a migration error. Thanks garry-cairns!

-------------
* Support for Django 1.7 migrations. If you're still on Django < 1.7,
South migration files are stored in ``south_migrations`` directory.

-------------
* **IMPORTANT**: in older versions, passing multiple ``recipients`` into
``mail.send()`` will create multiple emails, each addressed to one recipient.
Starting from ``1.0.0``, only one email with multiple recipients will be created.
* Added ``LOG_LEVEL`` setting.
* ``mail.send()`` now supports ``cc`` and ``bcc``.
Thanks Ștefan Daniel Mihăilă (stefan-mihaila)!
* Improvements to ``admin`` interface; you can now easily requeue multiple emails.
* ``Log`` model now stores the type of exception caught during sending.
* ``send_templated_mail`` command is now deprecated.
* Added ``EMAIL_BACKEND`` setting to the new dictionary-styled settings.

-------------
* ``send_queued_mail`` now accepts an extra ``--log-level`` argument.
* ``mail.send()`` now accepts an extra ``log_level`` argument.
* Drop unused/low cardinality indexes to free up RAM on large tables.

-------------
* ``send_queued_mail`` now accepts ``--lockfile`` argument.
* Lockfile implementation has been modified to use symlink, which is an atomic operation
across platforms.