message: demo: Add obj loading timing
  This will help us optimize .obj loading for the demo program, which will
  result in an .obj parser that will hopefully be useful to somebody one
  day.
diff: @@ -194,7 +194,9 @@ int main(int argc, char** argv)
  if (argc > 1)
  {
  + clock_t start = clock();
  mesh = readOBJ(argv[1]);
  + clock_t end = clock();
  if (mesh.vertices.empty())
  {
  @@ -202,7 +204,7 @@ int main(int argc, char** argv)
  return 0;
  }
  - printf("Using %s (%d vertices, %d triangles)\n", argv[1], int(mesh.vertices.size()), int(mesh.indices.size() / 3));
  + printf("Using %s (%d vertices, %d triangles); read in %f msec\n", argv[1], int(mesh.vertices.size()), int(mesh.indices.size() / 3), double(end - start) / CLOCKS_PER_SEC * 1000);
  }
  else
  {
  