thoughtbot/bourbon — pull request #234 by renatocarvalho (2013-06-03 21:29:04+00:00)
Title: Using "image-url" instead "image_url" to prevent wrong image paths

On a rails 4 app having "config.assets.digest = true". The "image_url" on the mixin outputs the css asset name without the fingerprinted names. And that makes the image does not appear.