[fix] ensure path works on windows because path.join doesnt like URLs

Author: jcrugzz

lib/http-proxy/common.js

@@ -1,5 +1,4 @@
 var common = exports,
-    path   = require('path'),
     url    = require('url'),
     extend = require('util')._extend;
 
@@ -72,7 +71,9 @@ common.setupOutgoing = function(outgoing, options, req, forward) {
     ? url.parse(req.url).path
     : req.url;
 
-  outgoing.path = path.join(targetPath, outgoingPath);
+  outgoing.path = targetPath
+    ? targetPath + '/' + outgoingPath
+    : outgoingPath;
 
   return outgoing;
 };