Can choose color to paint live cell

enum added to choose colors.  findChosenColor() draws the color set
when creating the grid square object
Can now set the live cell color

Can choose between red, black and green.  Changes made to JMenuItem.
It is now a JRadioButtonMenuItem.  This makes a check mark show up when
an option is selected.  The skeleton for zooming in and out was also
set up.
na
Merge branch 'master' of https://github.com/RyannWilcox/Life

Conflicts:
	bin/gamelife/GridSquare.class