fix transfer command block permission and host:port parsing

[alppp]

fixes #300

• lower permission level from 3 to 2 so command blocks can run /transfer (command blocks have permission level 2)
• parse host:port format from the hostname argument, so /transfer @p mc.stonelegion.com:25585 works correctly instead of producing mc.stonelegion.com:25585:25565

Technically you needed to use transfer @p mc.stonelegion.com 25585