Step 12

Great tutorial, awesome job guys!

While I was going through the steps I felt there was something missing though: The ability to create reusable components with Angular.

After some research, I found out it's not actuallu missing from Angular, it's just missing from the tutorial.

Please consider adding another step that teaches how to use module directives to accomplish this.
I've made a quick sample of how the code could look in this pull request (app/using_components.html).
Of course, it can be improved, but it gives the idea.