Rename fletch -> dartino

tests/unsorted/messaging_process_die_early_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';
 import 'package:isolate/process_runner.dart';
 
 const int PROCESSES = 5000;
 const int MESSAGES = 10;
 
 void main() {
   withProcessRunner((runner) {
     for (int i = 0; i < PROCESSES; i++) {
@@ skipping 12 matching lines @@
   }
 }
 
 void portReceiver(Port output) {
   Channel input = new Channel();
   output.send(new Port(input));
   for (int i = 0; i < MESSAGES ~/ 2; i++) {
     input.receive();
   }
 }