Added custom headers to EmailMultiAlternatives in send_html_mail function.
Add db_index=True to when_added and priority fields

These two fields are frequently filtered on and would probably benefit from being indexed
- added a cron mode to the management commands
Close connection to db after send_mail command to prevent psql 'unexpected EOF on client connection with an open transaction' error
Ensure db connection is closed for retry_deferred
Forced to default db connection when prioritizing

Problems with transactions when reading from slave db connection
Corrected URL in README
Added simple usage instructions to README, and made usage.txt less Pinax specific
Added some basic tests
Added tox file for testing on multiple Django versions
Python 3 compatibility
Cleaned up test_settings file
Merge pull request #18 from spookylukey/python3

Python 3 compatibility
Merge pull request #15 from jacinda/master

Close connection to db after send_mail command
Merge pull request #14 from alepane21/master

- added a cron mode to the management commands
Merge pull request #9 from nabucosound/971cb0e97c1cdc1d3265dbf4d68c70af64738a5d

Enable headers param in send_html_email
Merge pull request #3 from andybak/patch-1

Add db_index=True to when_added and priority fields
Merge branch 'master' into issue_1

Conflicts:
	mailer/engine.py
	mailer/management/commands/retry_deferred.py
	mailer/management/commands/send_mail.py