Rails 4.1 support?

Hi there,

Is there a plan for Rails 4.1 support? When working on upgrading an existing app to 4.1.0.beta1, octopus is failing to load because of the removal of HasAndBelongsToMany as an association type (rails/rails@5864b9a894a784aea3500d7b72ab78b6f23c6fe9). I have only been using octopus for a month or so, but if it's as simple as removing the code that expects that association type to exist from octopus, I'd be happy to issue a PR.

Wanted to get some thoughts first!