Consider adding actors field to families

[yankovs]

Hey :)!

It would be cool if the family summary would include the actors associated with it. Somewhat similar to the way Malpedia has this info present:

It does change the DB's overall schema I guess, but since it's only addition of data on top of existing JSONs I think it's ok. What do you think?

[danielplohmann]

Yeah, this will become immediately possible once tagging is added, see #53.