Update to latest 1.6.4 server and fix (Async)PlayerPreLoginEvent

Apparently Mojang modified the 1.6.4 lightly, which caused the MD5 file check to fail, so I have fixed the patches and updated the MD5.

Lastly, I have also fixed (Async)PlayerPreLoginEvent whose IP address was the proxy IP when using BungeeCord, effectively blocking the ability from plugins check their IP before letting players in.