mixinternet/mix-rails — pull request #3 by rafbgarcia (2013-02-17 20:38:26+00:00)
Title: Retirado coffee-filter

estava dando erro, pois não precisa a partir da versão 4 do haml.

https://github.com/paulnicholson/coffee-filter

"Haml >= 4.0 includes built-in support for coffeescript."