Added ability to specify which dimension should be resized in the retina media query. Added more browser prefixes. #3
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I found some cases where I wanted the height to be set and the width at auto (for example, a horizontally spanning background image) so I've added a new variable to the @Mixins. Width is still the default, but if you add a second variable called "height" it will set that value instead.
Also, expanded the media queries to include a bunch more browser prefixes.