Study phase stimuli lists

Hey Almas,
I've got the study phase stimuli list generation working.  This pull request contains a sample folder with one random run of the stimgen.  You mentioned that SuperLab can't parse more than one column from a file, so there are two separate input files for the study phase: study-img listing the image paths, and study-occupation listing the occupation strings.  Hopefully this will get you bootstrapped for writing the Superlab script!

I'll try to got the matching phase and test phase lists generated tomorrow.

Also, I'm uploading the latest face composites so I'll send you a link to that when it's up (probably tomorrow).