title: Change the Title on a Google Maps Marker
body: <p>Given a google maps marker how can I change the title ?</p>
  
  <pre><code>var _marker = new google.maps.Marker({
    position: aPoint,
    map: mmap,
    title:"old title"
  });
  </code></pre>
  
  <p>I have tried</p>
  
  <pre><code>_marker.setTitle("new title");  
  </code></pre>
  
  <p>and</p>
  
  <pre><code>_marker.title = "new title";
  </code></pre>
  
  <p>but the title is still "old title"</p>