Refactor: extract RetroController#show's find or create logic out into private func
Refactor: extract RetroController#show's find or create logic out into private func

tnewell5/remote_retro,stride-nyc/remote_retro,stride-nyc/remote_retro,stride-nyc/remote_retro,tnewell5/remote_retro,samdec11/remote_retro