/ csv.rb - rows are read into an array of arrays

[ [a,b,c,d,e] , [a,b,c,d,e] , ... , [a,b,c,d,e] ]
+ Directory entry initializing scripts

materias.rb - Initializes subject entities

==> materias.csv <==
CLAVE,ASIGNATURA

profesores.rb - Initializes posixGroups and posixAccount entities

==> profesores.csv <==
id_prof,num_trab,curp,RFC,nombre