bug fix than closed task dont disappear
add gem for tag and versioning
rake acts_as_taggable_on_engine:install:migrations
rake db:migrate
modify reference task to user
add tag in model
add method to get user tag list
delete nouse line
add @tag_list in tasks controller
add taglist in new task form
add tags form function
when click tag, change class to display selecting
新規追加したタグにクリックイベントを紐づける[]
modify relation model & tag
delete comments
tagging in create and index method
apply checkbox in task tag setting
add new tag
no use arrow
contain tag_list in edit response