puavo-web: refactor test code
puavo-web: save mountpoint by json
puavo-web: mounpoints for the device edit page
puavo-web: add mountpoints to the device show page
puavo-web: link for appeding more line for the mountpoints form
puavo-web: fine-tune UI
puavo-web: include Mountpoint to School class
puavo-web: refactor
puavo-web: refactor
puavo-web: add mounpoints to the school page
puavo-web: do not save empty values