title: Add timestamps to compiled sass/scss
body: <p>Is it possible to automatically add a timestamp on the compiled CSS file using SASS?
  e.g.</p>
  
  <pre><code>/* CSS Compiled on: {date+time} */
  ...compiled css goes here...
  </code></pre>
  
  <p>I've checked the SASS and Compass docs but no mention of such a feature.</p>