Update project authors statements to Dartino

pkg/immutable/lib/src/red_black_tree.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.
 
 part of immutable;
 
 class RedBlackTree {
   final Node root;
 
   factory RedBlackTree() => new RedBlackTree._(null);
 
@@ skipping 142 matching lines @@
       var newRight;
       if (right == null) {
         newRight = new Node(true, null, null, key, value);
       } else {
         newRight = right.insert(key, value);
       }
       return _rebalance(new Node(isRed, left, newRight, this.key, this.value));
     }
   }
 }