Compress images with cjpeg

```
ls *.jpg | while read file; do echo $file; /usr/local/Cellar/mozjpeg/2.0.1/bin/cjpeg -quality 60 -optimize -outfile out_$file $file; done
ls out_* | while read file; do mv $file $(echo $file | cut -d'_' -f 2-); done
```