command.js

/* 
    Original by Paul Irish and Modified from
    http://www.paulirish.com/2008/how-to-iterate-quickly-when-debugging-css/
*/
(function() {
    var i, a, aLength, s;
    
    a = document.getElementsByTagName('link');
    aLength = a.length;
    for (i=0; i < aLength; i++) {
        s = a[i];
        if (s.rel.toLowerCase().indexOf('stylesheet') >= 0 && s.href) {
            var h = s.href.replace(/(&|\?)forceReload=\d+/,'');
            s.href = h + (h.indexOf('?') >= 0 ? '&' : '?') + 'forceReload=' + (new Date().valueOf());
        }
    }
})();

command.json

{
    "name": "Refresh CSS",
    "description": "Reload just your CSS. Great for iterating quickly in JavaScript heavy applications.",
    "link": "http://goo.gl/jjYy1V"
}