Implement handling of title searches that redirect

[denkristoffer]

FIlm Buff needs to implement handling of title searches that redirect to a specific title. A FilmBuff::Title object should be returned.

I was going to add this back in the day but I never got around to it. I've since forgotten which search query I found that required this functionality, so I don't expect to work on this until I find another query where the redirect happens – or until someone else finds one and tells me about it.