title: Knockoutjs : How to add title to options in select
body: <p>I use Knockoutjs options binding to populate my selects as this</p>
  
  <pre><code>&lt;select data-bind="value: val, options: options, optionsText: 'text', optionsValue: 'ID'"&gt;
  &lt;/select&gt;
  </code></pre>
  
  <p>But for some option, the text is the same. Then I would like to add a title attribute to add information. Can I do that with knockout without modifying knockoutjs itself ?</p>
  
  <p>May be using a function in optionsText, but I can't see How</p>