code: function (message, type, wait) {
  				var log = document.createElement("article");
  				log.className = "alertify-log" + ((typeof type === "string" && type !== "") ? " alertify-log-" + type : "");
  				log.innerHTML = message;
  				// append child
  				elLog.appendChild(log);
  				// triggers the CSS animation
  				setTimeout(function() { log.className = log.className + " alertify-log-show"; }, 50);
  				this.close(log, wait);
  			}
docs: Add new log message
  If a type is passed, a class name "alertify-log-{type}" will get added.
  This allows for custom look and feel for various types of notifications.
  
  @param  {String} message    The message passed from the callee
  @param  {String} type       [Optional] Type of log message
  @param  {Number} wait       [Optional] Time (in ms) to wait before auto-hiding
  
  @return {undefined}