dlib RuntimeError: Unable to open `shape_predictor_68_face_landmarks.dat`


`RuntimeError: Unable to open /home/simon/face_morpher/data/shape_predictor_68_face_landmarks.dat`

This can be fixed by downloading this data into the `data` directory

```bash
mkdir data
wget http://dlib.net/files/shape_predictor_68_face_landmarks.dat.bz2
bunzip2 shape_predictor_68_face_landmarks.dat.bz2
mv shape_predictor_68_face_landmarks.dat data/
```

