Switch avatars to be built out of CSS and only overlayed with the gravatar when a non-default exists

endpoints/api/superuser.py

@@ -108,7 +108,7 @@ def user_view(user):
     'username': user.username,
     'email': user.email,
     'verified': user.verified,
-    'avatar': avatar.compute_hash(user.email, name=user.username),
+    'avatar': avatar.get_data_for_user(user),
     'super_user': superusers.is_superuser(user.username)
   }