Changed proxyServer and destiny to local variables.

Author: Jorge Leal

test/lib-http-proxy-test.js

@@ -379,9 +379,9 @@ describe('lib/http-proxy.js', function() {
         target: 'ws://127.0.0.1:' + ports.source,
         ws: true
       });
-      proxyServer = proxy.listen(ports.proxy);
+      var proxyServer = proxy.listen(ports.proxy);
       var server = http.createServer();
-      destiny = io.listen(server);
+      var destiny = io.listen(server);
 
       function startSocketIo() {
         var client = ioClient.connect('ws://127.0.0.1:' + ports.proxy);