Update project authors statements to Dartino

src/vm/thread_posix.h

-// Copyright (c) 2014, the Fletch project authors. Please see the AUTHORS file
+// Copyright (c) 2014, 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.
 
 #ifndef SRC_VM_THREAD_POSIX_H_
 #define SRC_VM_THREAD_POSIX_H_
 
 #ifndef SRC_VM_THREAD_H_
 #error "Don't include thread_posix.h directly, include thread.h."
 #endif
 
@@ skipping 32 matching lines @@
   friend class Thread;
 
   explicit ThreadIdentifier(pthread_t thread) : thread_(thread) {}
 
   pthread_t thread_;
 };
 
 }  // namespace fletch
 
 #endif  // SRC_VM_THREAD_POSIX_H_