Rename fletch -> dartino

samples/raspberry-pi2/basic/door-bell.dart

 // 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.
 //
 // A door bell example. Illustrates watching GPIO pin state with events.
 //
 // For breadboard layout and connections to the Pi, see:
-// https://storage.googleapis.com/fletch-archive/images/buzzer-schematic.png
+// https://storage.googleapis.com/dartino-archive/images/buzzer-schematic.png
 
 import 'package:gpio/gpio.dart';
 import 'package:raspberry_pi/raspberry_pi.dart';
 import 'package:os/os.dart';
 
 main() {
   // GPIO pin constants.
   const int button = 16;
   const int speaker = 21;
 
@@ skipping 15 matching lines @@
 
     // Sound bell.
     for (var i = 1; i <= 3; i++) {
       gpio.setPin(speaker, true);
       sleep(100);
       gpio.setPin(speaker, false);
       sleep(500);
     }
   }
 }