title: ng-bind on <title> doesn't work
body: <p>Using 1.3.0-rc1 (latest now).</p>
  
  <p>I tried:</p>
  
  <pre><code>&lt;title ng-bind="title"&gt;&lt;/title&gt;
  
  &lt;title&gt;{{title}}&lt;/title&gt;
  </code></pre>
  
  <p>But nothing.</p>
  
  <p>If I do <code>{{title}}</code> anywhere in <code>&lt;body&gt;</code> it works.</p>
  
  <p>I'm doing:</p>
  
  <pre><code>app.main.run(function($rootScope) {
      $rootScope.$on('$routeChangeSuccess', function(event, current, previous) {
          if (current.hasOwnProperty('$$route')) {
              $rootScope.title = current.$$route.title;
          }
      });
  });
  </code></pre>
  
  <p>I can see my <code>title</code> in the model. What's going on with the <code>&lt;title&gt;</code> tag?</p>