Update project authors statements to Dartino

pkg/immutable/test/rbtree_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.
 
 library immutable.rbtree_test;
 
 import 'package:immutable/immutable.dart';
 
 import 'package:test/test.dart';
 
 main() {
@@ skipping 40 matching lines @@
 
         insertRange(0, NUM - 1);
         for (int i = 0; i < NUM; i++) {
           expect(tree.lookup(i), 100 + i);
         }
       });
     });
   });
 }