add publish date to posts table
Add shcedule page
Add schedule route
add schedule action to admin posts controller
rename the publish helper
Add publish date if post doesn't have
change the scope publish(including the published date validation
rename the publish date i18n
add link to i18n
add link to shcedule.html in admin's nav
Done publish date, publish(select), and classification of countries
add publish date to admin posts index
Add datepicker gem and done setting
Add page/*.js to precompile and set page/posts.js