raulghm/Font-Awesome-Stylus — pull request #7 by justinlocsei (2014-06-27 14:04:28+00:00)
Title: Fix literal variable-name inclusion in rotation mixins

Stylus was getting confused by the attempted interpolation of the rotation value in the `filter` property and was rendering the `filter` value with a literal `{$rotation}` string in it. Using string addition resolves the value of the variable and generates a valid `filter` value.