Added Django manage command to send messages.
Removed unused "args" help text.
Fixed some awkward formatting.
Removed debug code.
Added setting and default for the number of emails to send at a time.
Renamed command to send_queued_messages to prevent potential conflicts with other apps.
Fixed an error caused by a missing import.
Fixed warning when timezone support is enabled.
Added support for MAILQUEUE_LIMIT to the run_mail_job view.
Moved duplicate code into a new custom model manager.
Updated documentation for the management command and related changes.
Merge pull request #12 from rspeed/master

Django management command for sending queued messages