add admin and product acitons implement controller functions and views
add devise, user add is_admin to determine identity
fix word spelling error
fix quantity error
form replace by simple_form
add bootstrap nav style
add register link
add index
link to root index
- admin product add destroy / show
- add carrierwave /nested form for upload mutil photos
- add root index
update form layout
update views layout

- admin/product :  new/show/index
add current_user is_admin check to show new/delete
fix user permission, normal user can't show admin
add photo migration
add uploader for photo
add user permission check in admin/product
typesetting
remove unused property
add product index