Update project authors statements to Dartino

pkg/gpio/lib/gpio.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.
 
 /// GPIO support providing access to controlling GPIO pins.
 ///
 /// Currently this has only been tested with a Raspberry Pi 2.
 ///
 /// Access types
 /// ------------
 /// The library provide two ways of accessing the GPIO pins: direct access or
@@ skipping 374 matching lines @@
   /// Exception message.
   final String message;
   /// OS error number if any.
   final int errno;
   const GPIOException(this.message, [this.errno]);
   String toString() {
     if (errno == null) return message;
     return '$message (error ${errno})';
   }
 }