jpegoptim need -d option to define output folder

``` bash
$jpegoptim -h
  jpegoptim v1.2.3  Copyright (c) Timo Kokkonen, 1996-2009.
  Usage: jpegoptim [options] <filenames>

    -d<path>, --dest=<path>
                    specify alternative destination directory for
                    optimized files (default is to overwrite originals)
...
```