Rename fletch -> dartino

tests/unsorted/messaging_many_to_single_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.
 
-import 'dart:fletch';
+import 'dart:dartino';
 
 import 'package:expect/expect.dart';
 
 const int PROCESSES = 200000;
 
 void main() {
   var channel = new Channel();
   var port = new Port(channel);
   Stopwatch watch = new Stopwatch()..start();
   for (int i = 0; i < PROCESSES; i++) {
     Process.spawnDetached(() => portResponder(port));
     Expect.equals(null, channel.receive());
   }
   print("Took ${watch.elapsedMicroseconds} us to start $PROCESSES process and"
         "sending one message.");
 }
 
 void portResponder(Port output) {
   output.send(null);
 }