change code of methods:
 initialize(), handleClick(), draw(), constructor in Board
 draw() in Hex
delete parameters of methods:
 isAbove(), isBelow(), Hex constructor
change variable name: gridSize(Board) --> boardSize
add variables and methods: orb, isClicked, updateOrb(), updateClick() in Hex
take out constant value of hexagon from Hex
clicked tile can be unclicked
move unused code from board.js to junk.js