Support NZBhydra2

https://github.com/theotherp/nzbhydra2

I see a couple of requests have been made for NZBhydra plus something else already. Here's another, just for NZBhydra.

NZBhydra2 is the current version, I'm just making sure we're all talking about the current one :)

From my point-of-view, it's the only thing I'm missing so far.

• Paul