Support for non-vanilla mobs

[stvncao5]

I've noticed via the debugger that when I kill non-vanilla mobs, the plugin recognises my configuration and all just fine, but it never fires the scheduleDrop event like it does for vanilla mobs.

[Zarius]

There is some support for non-vanilla mobs but last I looked into it needed a custom build of OtherDrops. I'll do some digging and look into this again soon.