url: significantly improve the performance of the url module

(landed by @rvagg)

PR-URL: #1561
Reviewed-By: Domenic Denicola <[email protected]>
Reviewed-By: Rod Vagg <[email protected]>

Author: petkaantonov

lib/_http_client.js

@@ -20,7 +20,7 @@ function ClientRequest(options, cb) {
   OutgoingMessage.call(self);
 
   if (typeof options === 'string') {
-    options = url.parse(options);
+    options = url.parse(options).toJSON();
   } else {
     options = util._extend({}, options);
   }

lib/https.js

@@ -107,7 +107,7 @@ exports.Agent = Agent;
 
 exports.request = function(options, cb) {
   if (typeof options === 'string') {
-    options = url.parse(options);
+    options = url.parse(options).toJSON();
   } else {
     options = util._extend({}, options);
   }