Completed TODO 1 on these classes...

HumanPlayer
moved tests into main method
documentation checked
ALL conventions obeyed
CLASS COMPLETED

ConnectFourPiece
moved tests into main
documentation checked
ALL conventions obeyed
CLASS COMPLETED

GUI
documentation checked
ALL conventions obeyed
CLASS COMPLETED

ConnectFourGameGUI
tests checked
documentation checked
documentation added
accessor methods added
ALL conventions obeyed
CLASS COMPLETED