Update project authors statements to Dartino

src/tools/flashtool/flashtool.gyp

-# 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.
 
 {
   'target_defaults': {
     'include_dirs': [
       '../../../',
     ],
   },
   'targets': [
     {
       'target_name': 'flashtool',
       'type': 'executable',
       'toolsets': ['target'],
       'dependencies': [
         '../../vm/vm.gyp:libfletch',
         '../../vm/vm.gyp:fletch_relocation_library',
       ],
       'sources': [
         'main.cc',
       ],
     },
   ],
 }