hotfix for IE icon issue

Based on the discussion at [this StackOverflow thread](http://stackoverflow.com/questions/26388937/how-can-i-stop-ie-from-compounding-relative-font-sizes-in-pseudo-elements/) and [this open Microsoft bug report](https://connect.microsoft.com/IE/feedback/details/813398/ie-11-css-before-with-font-size-in-em-units-ignores-css-precedence-rules), it looks like IE can't handle relative font sizes in pseudoelements. Instead of cascading and allowing relative font sizes to be overridden, like all the other browsers, IE takes all the pseudoelement relative font sizes it can find and multiplies them all together. Hilarity ensues, as evidenced in mlaa/cac-advanced-profiles#79. Moving back to absolute font sizes on this one is a necessary evil, it looks like. 

I don't know why this branch can't be automatically merged, but I'm guessing it's the ever-complicated sourcemap, which can just be checked out of the hotfix branch, since it doesn't need to be properly merged.