Missing libraries

[alankrantas]

Looks like the esp-dl (https://github.com/espressif/esp-dl, former esp-face) repo has changed so much that many libraries went missing in this example. My temporary solution is go to this forked repo and copied all the .c and .h files under image_util and lib into the project dir to make it work.

It would be great if you can update it to fit Espressif's new APIs.