workaround
Add migration
Merge pull request #17 from hoshinotsuyoshi/user_find_or_create_by

Use User.find_or_create_by
Close EventListener
Merge pull request #18 from hoshinotsuyoshi/close_eventlistener

Close eventlistener
puma
Merge pull request #19 from hoshinotsuyoshi/puma

puma
Remove Turbolinks