title: Set page title from a child template in Jade
body: <p>I'm wanting to set my page titles in the child templates of the layout via jade. I don't want to set them in the routes since that requires a server restart. Here's what I'm hoping to accomplish:</p>
  
  <p><strong>layout.jade:</strong></p>
  
  <pre><code>!!! 5
    head
      - var title = title || "Default Title Here"
      title #{title}
      // ...
  </code></pre>
  
  <p><strong>child.jade:</strong></p>
  
  <pre><code>- var title = "Child Title Here"
  extends layout
  // ...
  </code></pre>
  
  <p>Any thoughts on how I can accomplish this would be a great help.</p>
  
  <p>Thanks!</p>