add account/order to view orders

- rails g controller account/order
- add namespace account, resources orders in route.rb
- order.rb add scope :recent to get order list
- controller def a show method to get @orders
- new a index.html.erb to show orders list
fix redirect error path
fix order status error : pay button must be hidden when order paid
admin can see user's order

- rails g controller admin/orders
- add resources: orders in namespace admin in route.rb
- add 2 functions to render user-email and order state
- controlller add show method
- build a admin/orders/index.html.erb to show all orders
- common/_navbar.erb.html add link to admin_orders_path
admin can chage order state

- admin/orders_controller 建立 ship/shipped/cancel/return 改變訂單狀態
- add ship/shipped/cancel/return in routes.rb
- new admin/orders/_state_option.html.erb
  case the order.aasm_state to show different states
-  helpers/admin/orders_helper add  render_order_option_for_admin(order)  to render partial _state_option.html.erb
- build admin/orders/show.erb.html