Certain commands need to execute anyway even if user doesn't have permissions.

[GoogleCodeExporter]

When a guest types "shout hello" or similar, they see "shout: command not 
found". Instead, they need to see "Only registered players can use the shout 
command." - this code is currently handled inside of the ShoutCommand process() 
implementation. I do not really want to do some hack that changes the level of 
the shout command to guest (But I will if I HAVE to).
We need to have another look at permissions.

Original issue reported on code.google.com by John.Nahlen on 10 Nov 2011 at 2:45