Update project authors statements to Dartino

tests/service_tests/performance/performance_service.idl

-// 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.
 
 service PerformanceService {
   int32 echo(int32 n);
 
   int32 countTreeNodes(TreeNode* node);
   TreeNode* buildTree(int32 n);
 }
 
 struct TreeNode {
   List<TreeNode> children;
 }