Removed goal "Respond to user zoom on image resource".

See #5 for discussion

Author: marcoscaceres-remote

ResponsiveImages.html

@@ -212,7 +212,6 @@ <h1>Goals</h1>
     <ul>
           <li>Respond to different screen pixel width/height.</li>
           <li>Respond to different screen pixel densities.</li>
-          <li>Respond to user zoom on image resource.</li>
           <li>Provide user agents with information they need to select the most appropriate image source given low bandwidth situations.</li>
           <li>Will fallback gracefully on older user agents.</li>
           <li>Can be polyfilled effectively.</li>