Update project authors statements to Dartino

src/shared/platform_lk.cc

-// 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.
 
 #if defined(FLETCH_TARGET_OS_LK)
 
 // We do not include platform_posix.h on purpose. That file
 // should never be directly inported. platform.h is always
 // the platform header to include.
 #include "src/shared/platform.h"  // NOLINT
 
@@ skipping 187 matching lines @@
   return 0;
 }
 
 char* Platform::GetEnv(const char* name) { return NULL; }
 
 int Platform::MaxStackSizeInWords() { return 16 * KB; }
 
 }  // namespace fletch
 
 #endif  // defined(FLETCH_TARGET_OS_LK)