Rename fletch -> dartino

tests/coroutine/stack_overflow_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() {
   testRecursion(0);
   testRecursion(10);
   testRecursion(100);
   testRecursion(1000);
 }
 
 void testRecursion(n) {
   var co = new Coroutine(recurse);
   Expect.isTrue(co.isSuspended);
   Expect.equals(42, co(n));
   Expect.equals(87, co(87));
   Expect.equals(99, co(42));
   Expect.isTrue(co.isDone);
 }
 
 int recurse(n) {
   if (n == 0) {
     Expect.equals(87, Coroutine.yield(42));
     Expect.equals(42, Coroutine.yield(87));
     return 99;
   } else {
     return recurse(n - 1);
   }
 }