0.01 adam Thu Feb  8 14:28:18 2006  
    - initial revision
    - supports authentication
    - supports roles

0.02 adam Fri Feb 10 14:10:23 PST 2006
    - Now throws an exception if the initial bind fails
    - Changed the default role_filter from (member=%s) to (memberUid=%s)
    - Fixed bug in Backend->lookup_user that was not properly handling
      when a user was not found in the backing store at all.