patch for <link> support

I added this patch on line 441 to add support for "link" tag

if(link.getAttribute("media").replace(/^\s\s_/, '').replace(/\s\s_$/, '') != ""){ text = "@media " + link.getAttribute("media").replace(/^\s\s_/, '').replace(/\s\s_$/, '') + "{" + text + "}"; }

has not been fully tested, it worked for me, something similar could be added for "style" tag.
