Rename fletch -> dartino

tests/unsorted/process_exit_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';
 
 main() {
   Expect.equals(42, run(createInt));
   Expect.equals("fisk", run(createString));
 
   var list = run(createList);
   Expect.equals(3, list.length);
   Expect.equals(1, list[0]);
@@ skipping 24 matching lines @@
   channel.receive().send(fn);
   return channel.receive();
 }
 
 void helper(Port port) {
   Channel channel = new Channel();
   port.send(new Port(channel));
   var fn = channel.receive();
   Process.exit(value: fn(), to: port);
 }