Add support for angular-fontawesome

[ghost]

Hi, i like your library a lot and i think is the best out there for angular. Currently i'm using it for an online shop https://acuamundo.com

Loading the entire library of icons when you are not using them all is not great. It would be better if to support this: https://fontawesome.com/how-to-use/on-the-web/using-with/angular This will make the entire app load faster.

I'll invite you a 🍺 and a 🍕

[CarlosTorrecillas]

@lukasz-galka , is this something you think you will do at some point?