Update project authors statements to Dartino

tests/unsorted/immutability_test.dart

-// Copyright (c) 2015, the Fletch project authors. Please see the AUTHORS file
+// 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 'package:expect/expect.dart';
 
 // This class is missing: final fields and const constructor.
 class Fisk {
   int age;
@@ skipping 74 matching lines @@
 }
 
 testImmutable(obj) {
   Expect.isTrue(isImmutable(obj));
 }
 
 testMutable(obj) {
   Expect.isFalse(isImmutable(obj));
 }