Added default port to default server in setup.

Currently, if host isn't specified (especially when using with pear-manager) it'll default to 127.0.0.1 with no port.
When trying to startup gearman-manager it'll get stuck in a loop forever as it can't connect to 127.0.0.1::. The solution is to change the default to 127.0.0.1:4730.
This is more of a convenience fix for new users, if theres a default/fallback it may as well work if possible.