ixCB is just a wrapper for a fancy checkbox transition.
It uses jquery and rails3.1 asset pipeline.
Add gem 'ixCB' to your Gemfile as asset.
After strating the server ixCB adds necessary lines to your application.css and application.js in order to maintain asset pipeline requirements.
Now, you are ready to use it! When you add a checkbox use data-on and data-off attributes to label checkbox.
At one of the javascript file you have included type $("your-checkbox-identifier").ixCB({labels['sth-positive', 'sth-negative']})