Add support for the node net module.

frog/lib/node/tty.dart

Index: frog/lib/node/tty.dart
===================================================================
--- frog/lib/node/tty.dart	(revision 0)
+++ frog/lib/node/tty.dart	(revision 0)
@@ -0,0 +1,13 @@
+// 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('tty');
+#import('node.dart');
+
+// module tty
+
+class tty native "require('tty')" {
+  static bool isatty(int fd) native;
+  static void setRawMode(bool mode) native;
+}