title: always trigger "change"-event for <select>, even if the select2-option clicked is already selected
body: <p>I have a native <code>&lt;select&gt;</code>-element based on which I'm initializing a select2-dropdown-menu.
  I bound a change-event via select2 which is called whenever the select2/select-option is changed. However, I need to fire the event even if the currently selected option is selected again.</p>
  
  <pre><code>function onSelectChange(){
      alert('changed');
  };
  
  $("#select").select2().bind('change', onSelectChange);
  </code></pre>
  
  <p>I prepared a <a href="http://jsfiddle.net/rb6pH/1/" rel="nofollow">http://jsfiddle.net/rb6pH/1/</a> - if "Alaska" is currently selected and then selected again via the select2-dropdown, onSelectChange() should fire again, triggering the alert.</p>
  
  <p>I have a hard time expressing myself, please ask if something isn't clear enough.</p>