mdo/preboot — pull request #46 by justinph (2013-10-17 19:03:34+00:00)
Title: simplify media queries for retina-image mixin

'min--moz-device-pixel-ratio' is now an unsupported media query from Mozilla. According to Chris Coyer (this)[http://css-tricks.com/snippets/css/retina-display-media-query/] works cross-browser and is much less verbose.