message: fix hello_world example drawing outside the window
diff: @@ -34,7 +34,9 @@ impl event::EventHandler for MainState {
  fn draw(&mut self, ctx: &mut Context) -> GameResult<()> {
  graphics::clear(ctx);
  - let dest_point = graphics::Point::new(0.0, 0.0);
  + // Drawables are drawn from their center.
  + let dest_point = graphics::Point::new(self.text.width() as f32 / 2.0 + 10.0,
  + self.text.height() as f32 / 2.0 + 10.0);
  graphics::draw(ctx, &mut self.text, dest_point, 0.0)?;
  graphics::present(ctx);
  Ok(())
  