Refactor whois.nic-se.se to use scanner, support statuses and contact/registrar info

I refactored whois.nic-se.se to use a scanner and to support arbitrary statuses (not all possible statuses returned by the server were recognized by the original parser) and contact/registrar information.

I did have to change specs a little: instead of status ":registered", we now have status ["ok"]. If this is not correct, I can add some code to convert the OK status into [":registered"].