Oh! I haven't noticed this change, this is awesome

Hi !

I'm currently trying to make a PR to implement a feature, i've created a field bodyClass into the Category settings and now i don't find how i can inject it into the body class when i'm into the topic list and reading a topic.

I've found that buildBodyClass is related to the URL, but i don't find how to use my custom attribute

There is any documentation about the source code?