Add a failing test for Topping.initialize
Changed pizza.rb to pass First Topping test
Add a vegetarian failing test for Topping.initialize
changed pizza.rb to pass vegetarian test
changed pizza_spec.rb, added initalize for pizza to record all toppings
changed pizza.rb, added a toppings array
changed pizza_spec.rb, to test for 0 topping pizzas, must always have 1 topping, cheese