Update project authors statements to Dartino

tests/unsorted/closure_this_property_set_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 {
   int x = 0;
   foo(y) {
     return () { x = y; };
   }
 }
 
 main() {
   var a = new A();
   var f = a.foo(42);
   Expect.equals(0, a.x);
   f();
   Expect.equals(42, a.x);
 }