V01.003 created toString to Swimmer.java
V01.004 Added Person and Trainer, Swimmer, NextOfKin now extend Person.
V01.005 New classes that I forgotten.
V01.006 - Gui WIP
Merge branch 'wdoberschuetz-master'
Merge branch 'master' of https://github.com/wdoberschuetz/SwimClubManager
Merge branch 'master' of https://github.com/martadoberschuetz/SwimClubManager