Check if event is triggered by a human
<p>I have a handler attached to an event and I would like it to execute only if it is triggered by a human, and not by a trigger() method. How do I tell the difference?</p>

<p>For example,</p>

<pre><code>$('.checkbox').change(function(e){
  if (e.isHuman())
  {
    alert ('human');
  }
});

$('.checkbox').trigger('change'); //doesn't alert
</code></pre>
