Update project authors statements to Dartino

platforms/stm/stm32_cube_f7_demos.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.
 
 {
   'variables': {
     'discovery_projects': '<(stm32_cube_f7)/Projects/STM32746G-Discovery',
   },
   'target_defaults': {
     'include_dirs': [
       '<(stm32_cube_f7)/Drivers/CMSIS/Include/',
@@ skipping 601 matching lines @@
             '-O',
             'binary',
             '<(PRODUCT_DIR)/<(project_name).elf',
             '<(PRODUCT_DIR)/<(project_name).bin',
           ],
         },
       ],
     },
   ],
 }