cacheBuster = function cacheBuster(url) {
                    var dc = new Date().getTime();
                    if (url.indexOf('?') >= 0) {
                        if (url.substring(0, url.length - 1) === '&') {
                            return url + '_dc=' + dc;
                        }
                        return url + '&_dc=' + dc;
                    } else {
                        return url + '?_dc=' + dc;
                    }
                }
Load a js/css file
@param type
@param path
@param params
@returns promise