BI = backward incompatible change

0.2.0
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 * BI: renamed Notice.user to Notice.recipient
 * BI: renamed {{ user }} context variable in notification templates to
   {{ recipient }}
 * BI: added nullable Notice.sender and modified send_now and queue to take
   an optional sender
 * added received and sent methods taking a User instance to Notice.objects
 * New default behavior: single notice view now marks unseen notices as seen
 * no longer optionally depend on mailer; use django.core.mail.send_mail and
   we now encourge use of Django 1.2+ for mailer support
 * notifications are not sent to inactive users
 * users which do not exist when sending notification are now ignored
 * BI: split settings part of notices view to its own view notice_settings

0.1.5
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 * added support for DEFAULT_HTTP_PROTOCOL allowing https absolute URLs