Add a failing test for Topping.initialize
Add new initialize method to Topping that sets a name. Also corrected spelling error in pizza_spec of the word 'olives'
Added failing test for vegetarian in Topping class
Added vegetarian argument for initialize method of Topping, which defaults to false. The tests for vegetarian now pass in pizza_spec.rb
Added a failing test for the Pizza class' initialize method, which should have an instance variable of toppings that holds an array of toppings
Added initialize method for Pizza class. It has an instance variable which holds an array of ingredients, called ingredients.
Added failing test for Pizza class initialize method, which should default the toppings to cheese only if there are no toppings passed in
Changed toppings in the Pizza initialize method to have a default value of an instance of Topping with name cheese