Update project authors statements to Dartino

pkg/file/lib/file.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.
 
 /// File access APIs. Only supported when Fletch is running on a Posix platform.
 ///
 /// Usage
 /// -----
 /// ```dart
 /// import 'package:file/file.dart';
 ///
@@ skipping 173 matching lines @@
   static bool existsAsFile(String path) => sys.access(path) == 0;
 }
 
 class FileException implements Exception {
   final String message;
 
   FileException(this.message);
 
   String toString() => "FileException: $message";
 }