Add "include Notification"
Refactor Comment#create
Merge pull request #90 from re-born/refactor

Refactor Comment#create
Tweak re_arrange
Merge pull request #94 from re-born/tweak-helper

Tweak re_arrange
Modify tags view
Merge pull request #95 from re-born/modify-tags-view

Modify tags view
Change datatype of first_image_url
Merge pull request #97 from re-born/change-datatype

Change datatype of first_image_url