Added code to generate Universally Unique IDentifier (UUID). CWB plans to use this to track tests and groups of tests more precisely than with a "testID".

Found code here http://www.mathworks.com/matlabcentral/fileexchange/21709-uuid-generation/content/uuidgen.m
Minor comment additions
Completion of SIN_getPlaylist.
Added SubjectID as input to generate subject-specific testing information, which must be used by various auxiliary functions.
Added specific.genPlaylist description to options structure.