Add support for the node net module.

frog/minfrog.dart

 // 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('minfrog');
 
 #import('lib/node/node.dart');
+#import('lib/node/path.dart');
+#import('lib/node/fs.dart');
+#import('lib/node/vm.dart');
 #import('file_system_node.dart');
 #import('lang.dart');
 
 void main() {
   // Get the home directory from our executable.
   var homedir = path.dirname(fs.realpathSync(process.argv[1]));
 
   // Note: we create a copy of argv here because the one that is passed in is
   // potentially a JS Array object from outside the sandbox. Hence it will have
   // the wrong prototype.
@@ skipping 21 matching lines @@
       process.argv.addAll(options.childArgs);
       // TODO(jmesserly): we shouldn't force the child process to patch argv.
       // Instead, we should be injecting code into the child to fix argv's
       // prototype (and possible the proto of require, process, and console).
       vm.runInNewContext(code, createSandbox());
     }
   } else {
     process.exit(1);
   }
 }