Rename fletch -> dartino

src/vm/natives_posix.cc

 // 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_POSIX)
+#if defined(DARTINO_TARGET_OS_POSIX)
 
 #include "src/vm/natives.h"
 
 #include <unistd.h>
 
 #include "src/vm/process.h"
 
-namespace fletch {
+namespace dartino {
 
 BEGIN_NATIVE(UriBase) {
   char* buffer = reinterpret_cast<char*>(malloc(PATH_MAX + 1));
   char* path = getcwd(buffer, PATH_MAX);
   Object* result = Failure::index_out_of_bounds();
   if (path != NULL) {
     int length = strlen(path);
     path[length++] = '/';
     path[length] = 0;
     result = process->NewStringFromAscii(List<const char>(path, length));
   }
   free(buffer);
   return result;
 }
 END_NATIVE()
 
-}  // namespace fletch
+}  // namespace dartino
 
-#endif  // defined FLETCH_TARGET_OS_POSIX
+#endif  // defined DARTINO_TARGET_OS_POSIX