visionmedia/nib — pull request #155 by vincentcr (2012-12-20 13:06:02+00:00)
Title: image mixin does not scale properly if size is omitted

Using the `image` mixin without specifying the size results in `background-size: auto auto`. This results in an unscaled image in retina displays. `background-size: 100% auto`, however, works.

This patch changes the default width to 100%.