fix loadCSS for relative URLs
fix loadCSS for relative URLs

adds support for relative URLs and URLs with level-navigation
Krinkle/loadCSS,filamentgroup/loadCSS,vovaane/loadCSS,jonasdk/loadCSS,Krinkle/loadCSS,eeebb/loadCSS,jonasdk/loadCSS,WeRockStar/loadCSS,Diaosir/loadCSS,eeebb/loadCSS,montyanderson/loadCSS,filamentgroup/loadCSS,geekz/loadCSS,vovaane/loadCSS,montyanderson/loadCSS,geekz/loadCSS,WeRockStar/loadCSS,Diaosir/loadCSS