Rename fletch -> dartino

tests/unsorted/spawn_port_argument_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';
 
 main() {
   Channel channel = new Channel();
   final Port port = new Port(channel);
   Process.spawnDetached(() => run(port));
   int id = channel.receive();
   Expect.equals(port.id, id);
   Expect.equals(port.id, channel.receive().id);
@@ skipping 22 matching lines @@
   port.send(0);
 }
 
 class Immutable {
   const Immutable();
 }
 
 class Mutable {
   var bar;
 }