Update project authors statements to Dartino

pkg/fletch_agent/tool/client.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.
 
 library fletch_agent.client;
 
 import 'dart:io';
 import 'dart:typed_data';
 
 import '../lib/messages.dart';
 import '../lib/agent_connection.dart';
@@ skipping 149 matching lines @@
       }
       await connection.signalVm(pid, signal);
       print('Send signal $signal to VM: id=$pid');
       break;
     default:
       print('Invalid command: $cmd');
       exit(1);
   }
   socket.close();
 }