Rename fletch -> dartino

tests/unsorted/messaging_benchmark_test.dart

 // Copyright (c) 2014, the Dartino 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.md file.
 
-import 'dart:fletch';
+import 'dart:dartino';
 
 import 'package:expect/expect.dart';
 
 const int PROCESSES = 1000;
 const int MESSAGES = 1000;
 
 void main() {
   Transceiver child = new Transceiver.spawn(runChild);
   child.send(PROCESSES);
   for (int i = 0; i < MESSAGES; i++) child.send(i);
@@ skipping 54 matching lines @@
   receive() => _input.receive();
   void send(message) => _output.send(message);
 
   static void _setupChild(Port port) {
     Channel child = new Channel();
     port.send(new Port(child));
     Function entry = child.receive();
     entry(new Transceiver._internal(child, port));
   }
 }