[cas-dev] JA-SIG java client

[Velpi]

> The main reason why *I* would like this is because my modified authentication 
> filter will choose whether or not to use renew/session/gateway/... based on the 
> principal (and it attributes). This is useful when you want another policy for 
> eg students and personnel. But it can only be accomplished if validation has 
> been done first.

I changed my mind:
I'm putting in a completely new filter for this, that's more flexible (and more 
easy; maybe I'll change my mind again later...).
But still, to me it feels better to switch the sequence to first do validation 
and then authentication...

-- Velpi