Rename fletch -> dartino

tests/coroutine/fiber_yield_channel_receive_test.dart

 // Copyright (c) 2015, 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.
 
 // Test that fibers that are blocked in a receive on a channel wake up
 // when there are messages on that channel.
 
-import 'dart:fletch';
+import 'dart:dartino';
 
 import 'package:isolate/isolate.dart';
 
 main() {
   var channel = new Channel();
   var initPort = new Port(channel);
   var isolate = Isolate.spawn(() => worker(initPort));
   var port = channel.receive();
   for (int i = 0; i < 10; i++) {
     port.send(1);
@@ skipping 10 matching lines @@
     while (running) {
       Fiber.yield();
     }
   });
   while (running) {
     var msg = channel.receive();
     if (msg == 0) running = false;
     Fiber.yield();
   }
 }