password-gorilla-1.5.3.6.3

I've been using the password-gorilla port that was posted here a few
years back but sadly never committed; at some point the newer version of
itcl broke it and I've finally gotten sick of manually reverting back
itcl every time I do pkg_add -u -i. So here's an updated port.

Can somebody please OK this so I can get it into the tree this time?