Write some save/write routines. Create FaceDatum and vector<FaceDatum>
which contains first, last names + emails + face icon.
I save each face to a file, whose name is first + last name.
The face found is cropped to a standard size (it is a subset of the image).
The faces are saved. The text data is stored in face_list.txt
Works on the mac (without the Kinect.) Use #define TEST  when running
on the Mac since I have problems with the Kinect.

One lingering problem. When testing against faces, a second face identical to the first
should be recognized as being the first, no?