Earlier quoted context omitted.
From what I've read, Github uses Mustache also. Logic-less templates are nice. It keeps code out of the views.
It keeps code out of the views. ...and put it in controllers, which is terrible for large-scale organization. I would hate to see what their back-end looks like.
I recommend you check out Chris Wanstrath's mustache library for Ruby: https://github.com/defunkt/mustache#readme