Merge pull request #48 from ozamasa/master

Change event image display
Merge branch 'master' of https://github.com/zomeki/zomeki-development
Forgot to commit
Fix edition relation
Keep prev editions up to 3
Fix prev editions count
Revert 672c20d79d828451fa01290e992ccff9e7343052
Add class to approval required doc
Keep selected categories even if link, accessibility and validation error occured
Measure against "ActionDispatch::Cookies::CookieOverflow"
Fix submit buttons
fix table_check_cell
Change html tag to holiday
Merge pull request #51 from ozamasa/master

Change html tag to holiday
Merge branch 'acc_checker5' of https://github.com/qqtq32/zomeki-development into qqtq32-acc_checker5
Fix against mobile client
Just change permission
Merge branch 'master' of github.com:zomeki/zomeki-development
Not uploaded file is now analyzed
Merge branch 'master' of github.com:zomeki/zomeki-development