How do I integrate this into my Rails app?

I have an existing Rails 4.1 app and I want to be able to roll out a /blog and have MiddleMan power that.

Ideally, I would like to add middleman to my Gemfile, and include the required files into my app.

I am not seeing anything about that though.

What is the best way to approach this, considering I want a single workflow with my Rails app?

Thanks.