Update project authors statements to Dartino

tests/debugger/implicit_rethrow_test.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.
 
 // FletchDebuggerCommands=r,q
 
 main() {
   try {
     throw 42;
   } on String catch (e) {
     print('not rethrowing from here');
   }
 }