Add a failing test for Pizza::Topping.initialize.
Add name method with attr_accessor for Pizza class
Add a failing test for verifying args passed through Pizza::Topping.initialize.
Add keyword argument vegetarian and use it as the instance var on Pizza::Topping.initialize.
Add a failing that passes the topping array during Pizza::Pie.initialize.
Add instance var toppings on Pizza::Pie.initialzie
Add a failing test which sets default args during Pizza::Pie.initialize.
Add default args to Pizza::Pie using Pizza::Topping class