title: Compass sprite background color
body: <p>Can compass generate a sprite with a solid background?</p>
  
  <p>I mean without alpha channel.</p>
  
  <p>I want the white background for reducing a file size.</p>
  
  <p><a href="http://minus.com/lb1IZXN3fe4aKq" rel="nofollow">See what I want</a></p>