- Make usage language more accurate by stating "repositories"

- Have usage counter be based on a 4 weeks TTL
- Add a simple usage counter breakage test

endpoints/api/superuser.py

@@ -64,7 +64,7 @@ class UsageInformation(ApiResource):
     if SuperUserPermission().can():
       return {
         'usage': model.get_repository_usage(),
-        'allowed': app.config.get('MAXIMUM_CONTAINER_USAGE', 20)
+        'allowed': app.config.get('MAXIMUM_REPOSITORY_USAGE', 20)
       }
 
     abort(403)