Rename fletch -> dartino

tests/unsorted/messaging_single_receiver_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 = 100;
 
 void main() {
   Stopwatch watch = new Stopwatch()..start();
   var channel = new Channel();
   var port = new Port(channel);
   for (int i = 0; i < PROCESSES; i++) {
     Process.spawnDetached(() => processRun(port));
   }
   int done = 0;
   while (done < PROCESSES) {
     int i = channel.receive();
     if (i == 0) done ++;
   }
   print("Took ${watch.elapsedMicroseconds} us to run $PROCESSES processes with "
         "$MESSAGES messages.");
 }
 
 void processRun(Port output) {
   for (int i = MESSAGES; i >= 0; i--) {
     output.send(i);
   }
 }