Add support for the node net module.

frog/lib/node/path.dart

Index: frog/lib/node/path.dart
===================================================================
--- frog/lib/node/path.dart	(revision 0)
+++ frog/lib/node/path.dart	(revision 0)
@@ -0,0 +1,15 @@
+// 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('path');
+
+class path native "require('path')" {
+  static bool existsSync(String filename) native;
+  static String dirname(String path) native;
+  static String basename(String path) native;
+  static String extname(String path) native;
+  static String normalize(String path) native;
+  // TODO(jimhug): Get the right signatures for normalizeArray and join
+}
+