refactor: /clients#entry
refactor: /clients#create
testing: confirm that /client#update workds
refactor: /clients#checkin_code
refactor: /clients#destroy
refactor: /clients#entries
cleanup: client/login routing mishmash
refactor: /clients#checkins
refactor: /clients#flags
refactor: /clients#barcode
refactor: /clients#card
refactor: /locations#index
refactor: /locations#show
refactor: /locations#new
refactor: /locations#edit
refactor: /locations#create
refactor: /locations#update
refactor: /locations#destroy
refactor: /messages#index
refactor: /messages#show