You may checkout this app by cloning it at github.com/relroy/capstone (remember to go into that folder)
Things you may want to cover:
Ruby version 2.1.3
This app has specific gem dependencies so be sure to bundle once you have cloned the app.
I have tests that I am working on soon to include for this app.
Please feel free to use a different markup language if you do not plan to run rake doc:app.