[add]add is_hidden
[feature]hide the products
[feature]add time now method
[migrate]add time_tag
[feature]add the show method
Merge branch 'hide_product' into dev

Conflicts:
	app/controllers/admin/products_controller.rb
	app/views/shops/_products.html.erb
[feature]change application.css
[delete]delete the application.css.scss
[fix]adjust the interface of admin
[feature]add linux command for running with printer
[chore]change the test