title: Adding !important using a Compass Mixin
body: <p>If I'm using compass for CSS and use a function or mixin like:</p>
  
  <pre><code>   @include background-image(linear-gradient(#a3cce0, #fff)); 
  </code></pre>
  
  <p>is there any easy way to have compass add !important to every line it generates?</p>