Eliminate Render-Blocking Font Awesome CSS

index.html

<script>
    function loadCSS(e, t, n) { 
    	"use strict"; 
        var i = window.document.createElement("link"); 
        var o = t || window.document.getElementsByTagName("script")[0]; 
        i.rel = "stylesheet"; 
        i.href = e; 
        i.media = "only x"; 
        o.parentNode.insertBefore(i, o); 
        setTimeout(function () { i.media = n || "all" }) 
    } 
    loadCSS("https://maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css");
</script>