More support for fonts

http://fortawesome.github.io/Font-Awesome/icons/ have little bit weird CSS to support 
<pre>
@font-face {
  font-family: 'FontAwesome';
  src: url('../fonts/fontawesome-webfont.eot?v=4.0.3');
  src: url('../fonts/fontawesome-webfont.eot?#iefix&v=4.0.3') format('embedded-opentype'), url('../fonts/fontawesome-webfont.woff?v=4.0.3') format('woff'), url('../fonts/fontawesome-webfont.ttf?v=4.0.3') format('truetype'), url('../fonts/fontawesome-webfont.svg?v=4.0.3#fontawesomeregular') format('svg');
  font-weight: normal;
  font-style: normal;
}
</pre>
We have to handle double src:url-property.