imathis/octopress — pull request #1258 by pluton8 (2013-05-19 13:01:37+00:00)
Title: image_tag plugin: automatically set proper image size for retina @2x images

If src is defined, and the filename has the '@2x' suffix, and if the
size is not specified, get image's dimensions and set width and height
half that size. This behavior is like on iOS.