change filepath function to work on win.

lib/paperboy.js

@@ -6,18 +6,19 @@ var
 
 
 exports.filepath = function (webroot, url) {
+  var pathSep=process.platform =='win32' ? '\\' : '/'
   // Unescape URL to prevent security holes
   url = decodeURIComponent(url);
   // Strip nullbytes (they can make us believe that the file extension isn't the one it really is)
   url = url.replace(/\0/g, '');
   // Append index.html if path ends with '/'
   fp = path.normalize(path.join(webroot, (url.match(/\/$/)=='/')  ? url+'index.html' : url));
   // Sanitize input, make sure people can't use .. to get above webroot
-  if (!/\/|\\$/.test(webroot[webroot.length - 1])) { webroot = path.normalize(webroot + '/'); }
+  if (webroot[webroot.length - 1] !== pathSep) webroot += pathSep;
   if (fp.substr(0, webroot.length) != webroot)
     return(['Permission Denied', null]);
   else
-    return([null, fp]);
+     return([null, fp.replace('/',pathSep)]);
 };
 
 exports.streamFile = function (filepath, headerFields, stat, res, req, emitter) {