FortAwesome/Font-Awesome — pull request #2492 by nielsenramon (2013-11-27 23:25:45+00:00)
Title: Remove -ms-keyframes

Only IE10 supports keyframes and that without the prefix (http://msdn.microsoft.com/en-us/library/ie/hh772747(v=vs.85).aspx). IE9 and lower have no support for keyframes (http://caniuse.com/#search=keyframe).

PR contains deleted -ms-keyframes :-).