first commit
before homework week 2
Merge branch 'store-v1'
生成訂單後清空購物車
從購物車刪除物品
user can change qty in cart
add total amount to cart, cant buy product with no stock
add account/orders and redirect to account/orders#index after payment
send email after paid by credit card and add link to order in email
add admin/orders, can set order state in index and show
before doing hw3
Merge branch 'store-v2'