Course admins can now access student grades by going to profile/[userid]

--HG--
branch : visible-grades

student/models.py

@@ -106,5 +106,5 @@ def add_user_to_group(group, user):
 
 def remove_user_from_group(group, user):
     utg = UserTestGroup.objects.get(name = group)
-    utg.users.add(User.objects.get(username = user))
+    utg.users.remove(User.objects.get(username = user))
     utg.save()