fix email to teachers (don't send to None)
-rw-r--r-- 375 .gitignore
-rw-r--r-- 93 .gitmodules
-rw-r--r-- 34519 LICENSE
-rw-r--r-- 836 NOTICE
drwxr-xr-x - chunks
drwxr-xr-x - contact
drwxr-xr-x - edumed
-rw-r--r-- 230 fabfile.py
-rwxr-xr-x 367 manage.py
-rw-r--r-- 25 requirements-dev.txt
-rw-r--r-- 667 requirements.txt
drwxr-xr-x - stage2
drwxr-xr-x - wtem