Support for PAPE extension in the PZH Web Interface.

http://jira.webinos.org/browse/WP-92

The PZH Web Interface now implements the OpenID Provider
Authentication Policy Extension (PAPE) and sets the maximum
authentication age to '0', requiring users to re-enter their
password when logging into the PZH and preventing the
OpenID provider from caching authentication information.

PAPE details: 
http://openid.net/specs/openid-provider-authentication-policy-extension-1_0.html

Jira issue: WP-92