The mob has to be in view with 1.8

This is for Spigot 1.8 Patch support and on going 1.8 support.
You may want to do this a bit nicer. 
It has three fixes, new TeleportPacket, moved the mob to infront of the player (must be in their fov) and changed it to a wither, so it can be hidden. 

I didn't change the name of the classes for the wither change... so you may want to do that. :)