wip
refs #3 Display who clicked like button.
Change like count realtime.
Resolve conflict.
Merge pull request #3 from fortkle/feature_likecount

Like Button Detail Information
Optimize a design.
Optimize a item display.
Add license text.
Modify readme.
refs #4 added migration for comment
refs #4 comment
refs #4 added destry
refs #4 comment edit
refs #4 remove debug alert
 refs #4 refactoring
refs #4 fix edit after edit problem
refs #4 fix html div replace bug
refs #4 refactor 2 => remove unnecessary sentry call
refs #4 move style to css
resolve conflict