Update project authors statements to Dartino

tests/unsorted/20_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 'package:expect/expect.dart';
 
 class A {
   static int s = 3;
 
   int f = 2;
   A();
 }
 
 
 void main() {
   var i = 4;
   i += 5;
   Expect.equals(9, i);
   A.s += 4;
   Expect.equals(7, A.s);
   A a = new A();
   a.f += 1;
   Expect.equals(3, a.f);
 }