Add a failing test for Topping.initialize.
Made code pass '.initalize' test by setting name.
Added set vegetarian topping test.
Code now able to set toppings as vegetarian.
Added '.initialize' method test to see if Pizza class could record toppings.
Code able to pass test for Pizza class to be able to store toppings.
Added test to default the toppings to cheese only if pizza has no toppings.
Changed code to set default toppings to cheese if no toppings.