Kerberos / SPNEGO / Active Directory Adapters

Hey,

I've upacked my Zend_Auth adapters for easy browsing here:

  http://www.ioplex.com/code/plexcel-zf-0.0.0/

Before we release this, I was hoping someone might sanity check these
classes and perhaps comment as to whether or not the code is
consistent with how Zend_Auth should be used. Language lawers and
opionions are also welcome.

Mike