fix relative path resolution after accidental file:/// prepend

Author: blahah

lib/url.js

@@ -47,7 +47,7 @@ url.cleanResourcePath = function(path, pageUrl) {
   } else if (/^file:\/\/\/?/i.test(path) ||
             (/^\//.test(path))) {
     // root relative path
-    var relative = path.replace(/^(file:)?\/+/gi, '');
+    var relative = path.replace(/^(file:)?\/+/gi, '/');
     return nodeurl.resolve(pageUrl, relative)
   } else {
     return nodeurl.resolve(pageUrl, path);