Update project authors statements to Dartino

pkg/immutable/lib/src/linked_list.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;
 
 // TODO(kustermann): Consider making a sentinal for an empty list instead of
 // representing empty lists as `null`.
 class LinkedList<T> {
   final T head;
   final LinkedList<T> tail;
@@ skipping 17 matching lines @@
   int get length {
     int count = 1;
     LinkedList<T> current = tail;
     while (current != null) {
       count++;
       current = current.tail;
     }
     return count;
   }
 }