* Make SAML authentication assertion and Lasso session available in the
environement.
* Autogeneration of SP metadata. (Requires Lasso 2.2.2 or newer.)
* Multiple IdP support, with discovery service.
* Built in discovery service which tests the availability of each IdP,
and uses the first available IdP.
* Fix a mutex leak.
* MellonSecureCookie option, which enables Secure + HttpOnly flags on
session cookies.
* Better handling of logout request when the user is already logged out.
