Config: fix SLO urls in sample config

The sample config fr-config.groovy.example was listing the SLO URLs
(for Shib SP 2.3 and 2.4) as:

          slo {
            artifact.uri = '$host/Shibboleth.sso/SLO/Artifact'
            slo.redirect.uri = '$host/Shibboleth.sso/SLO/Redirect'
            soap.uri = '$host/Shibboleth.sso/SLO/SOAP'
            post.uri = '$host/Shibboleth.sso/SLO/POST'
          }

Fix: remove the extra "slo." from the Redirect SLO URI
Config: Add SimpleSAMLphp SP to sample config

Add support for SimpleSAMLphp SP into sample config file
fr-config.groovy.example.

This config snippet lists the endpoints at URLs corresponding to a
default SimpleSAMLphp install.
Config: declare support for ShibSP 2.5.x

Declare support for ShibSP 2.5.x as part of Shib 2.4.x SP to avoid
confusion when users are looking specifically for 2.5.x.
Config: declare support for Shib IdP 2.4.x

Declare support for Shib IdP 2.4.x as part of Shib 2.3.x IdP to avoid
confusion when users are looking specifically for 2.4.x.
Revert "Config: declare support for Shib IdP 2.4.x"

This reverts commit 9e5f781845253fb21580cce3a193a50258d21171.
Config: really declare support for Shib IdP 2.4.x

Now really declare support for Shib IdP 2.4.x as part of Shib 2.3.x IdP
to avoid confusion when users are looking specifically for 2.4.x.
Merge pull request #132 from University-of-Auckland/aaf-develop

Config: SimpleSAMLphp support (and SLO URL fixes)