Add support for the node net module.

frog/lib/node/querystring.dart

Index: frog/lib/node/querystring.dart
===================================================================
--- frog/lib/node/querystring.dart	(revision 0)
+++ frog/lib/node/querystring.dart	(revision 0)
@@ -0,0 +1,35 @@
+// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#library('querystring');
+#import('node.dart');
+
+// module querystring
+
+typedef String QuerystringTranslator(String source);
+class Querystring {
+  var _qs;
+  Querystring._from(this._qs);
+  String stringify(Map obj, [String sep, String eq])
+    native "return this._qs.stringify(obj, sep, eq);";
+  Map<String,Object> parse(String str, [String sep, String eq])
+    => new _NativeMapPrimitiveValue(_parse(str, sep, eq));
+  var _parse(String str, String sep, String eq)
+    native "return this._qs.parse(str, sep, eq);";
+
+  QuerystringTranslator get escape()
+    native "return this._qs.escape;"; 
+
+  void set escape(QuerystringTranslator t)
+    native "this._qs.escape = t;";
+
+  QuerystringTranslator get unescape()
+    native "return this._qs.unescape;"; 
+
+  void set unescape(QuerystringTranslator t)
+    native "this._qs.unescape = t;";
+}
+
+Querystring get querystring() => new Querystring._from(require('querystring'));
+