implement logic for guest user's to maintain an order of items after sign up
closes 60127902

add test to check that logged in user has no orders before adding anything

add test for logged in user adding item to order

Add guest column to users table

implement creation of guest user upon adding item to cart

update user nav bar to show links for guest

update creation of order for guestss

complete guest user order and account transition

Remove testing stuff

WIP, update session#destroy to remove order from session params

guest user order logic, TESTS GO GREEN
merge guest-user into master
update gitignore