Pass events to custom charts

Currently I needed to be able to pass 'select', 'ready',... events to custom created charts.
This module is great but the events need to be added to the chart before the draw function is called.
See: https://developers.google.com/chart/interactive/docs/events

I wrote a small patch so everyone is able to bind his own custom events to the chart.
E.g:

 'events' => array(
    array(
        'event_name' => 'click',
        'func' => 'handleClick',
      ),
      array(
        'event_name' => 'select',
        'func' => 'handleSelect',
      ),
    ),

In google_chart_tools.js

if (element) {
   // Add listener
   chart[settings.chart[chartId]] = new google.visualization[settings.chart[chartId].chartType](element);
   // Add event listener
   var events = settings.chart[chartId].events;
   for (e in events) {
       var funct = window['handleReady'];
       google.visualization.events.addListener(chart[settings.chart[chartId]], events[e].event_name, window[events[e].func]);
    }
    chart[settings.chart[chartId]].draw(data, options);
}

I did not report this as a bug because it's a small feature.