Detect a face and replace it with Jeffs face

Uses openCv's Haar cascade filters to find faces and then scales repalcement image to scale and then photoshops it on top of face locations.

docker run -it -v $PWD:/data kavolorn/opencv bash

TODO:

1. better mobile image handling
2. non-recompute
3. make it less computationally expensive
4. cache results

From to