FortAwesome/Font-Awesome — pull request #4456 by Supuhstar (2014-09-16 15:25:07+00:00)
Title: Added rule to make .fa-spinner.spin step

Smooth spinning of .fa-spinner looks silly. I made it step and now it looks nice! SSCCE: http://jsfiddle.net/Supuhstar/r2krzam6/2/