bench: add url parser benchmark

benchmark/url.js

@@ -0,0 +1,22 @@
+var url = require('url'),
+    urls = [
+      'http://nodejs.org/docs/latest/api/url.html#url_url_format_urlobj',
+      'http://blog.nodejs.org/',
+      'https://encrypted.google.com/search?q=url&q=site:npmjs.org&hl=en',
+      'javascript:alert("node is awesome");',
+      'some.ran/dom/url.thing?oh=yes#whoo'
+    ],
+    paths = [
+      '../foo/bar?baz=boom',
+      'foo/bar',
+      'http://nodejs.org',
+      './foo/bar?baz'
+    ];
+
+urls.forEach(url.parse);
+urls.forEach(url.format);
+urls.forEach(function(u){
+  paths.forEach(function(p){
+    url.resolve(u, p);
+  });
+});