add quantity to line items, initialize data
error handling
add item price in cart page
add cart test
Merge branch 'feature/task_e_a_smarter_cart' into develop
moving the cart to sidebar
creating an ajax-based cart
highlighting changes
remove cart notice
hiding an empty cart
making images clickable
testing ajax changes
Merge branch 'feature/task_f_add_a_dash_of_ajax' into develop