The git branch, 'deployed', corresponds with the current active CourSys deployment. Take pains to ensure that it's not broken.
In order to deploy CourSys, you'll need superuser access to courses.cs.sfu.ca, as well as the git deployment key.
sudo -su coursys cd /home/coursys/courses git pull sudo /home/coursys/fastcgi/startfs.sh
That last bit restarts the Django CGI. Done!