Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
Having it upstream fontawesome would be quite an achievement 🙂 But https://github.com/mlwilkerson/fa-custom-icon-demo has a demo on adding custom icons inside a custom app.