Use Minecraftserver.ae() instead of
DedicatedServerConnectionThreade.d().ae()
This fixes
http://www.spigotmc.org/threads/server-not-responding-when-netty-is-disabled.1728/
and is a alternative to
https://github.com/EcoCityCraft/Spigot-Server/pull/57

Signed-off-by: V10lator <v10lator@myway.de>