Only accept file input
Run from command line
Refactor nested loops to be in each_cell_with_index method
Refactor nested loops to be each_cell method
Refactor and rename cell and grid names
Remove debugger
Add game runner class with repeating output with history
Add larger game of life board
Split grid and cell intro seperate files
Test no input file error
Abstract out alive and dead markers, cells should care how they are initialized