querystring: remove prepended ? from query field

Fixes an issue that caused the first querystring to be parsed prepending
a "?" in the first variable name on relative urls with no #fragment

Reviewed-by: Trevor Norris <trev.norris@gmail.com>

lib/url.js

@@ -132,7 +132,7 @@ Url.prototype.parse = function(url, parseQueryString, slashesDenoteHost) {
       if (simplePath[2]) {
         this.search = simplePath[2];
         if (parseQueryString) {
-          this.query = querystring.parse(this.search);
+          this.query = querystring.parse(this.search.substr(1));
         } else {
           this.query = this.search.substr(1);
         }

test/simple/test-url.js

@@ -867,6 +867,20 @@ var parseTestsWithQueryString = {
     'search': '',
     'pathname': '/',
     'path': '/'
+  },
+  '/example?query=value':{
+    protocol: null,
+    slashes: null,
+    auth: null,
+    host: null,
+    port: null,
+    hostname: null,
+    hash: null,
+    search: '?query=value',
+    query: { query: 'value' },
+    pathname: '/example',
+    path: '/example?query=value',
+    href: '/example?query=value'
   }
 };
 for (var u in parseTestsWithQueryString) {