Code review comment for lp:~widelands-dev/widelands-website/better_notification_mail

I had forgotten to update the packages of the virtual environment the last time. Did this now. The content of email send by django-messages are defined by django-messages itself, so the old templates (templates/notification/messages_*.txt) are obsolete and i have removed them in this branch.

django messages uses this template:

http://bazaar.launchpad.net/~widelands-dev/widelands-website/trunk/view/head:/templates/django_messages/new_message.html