Created `apache::mod::shib` to install, configure and manage Shibboleth Service Providers (SP)

Created a class apache::mod::shib to install, configure, and manage Shibboleth. Once this module is installed and configured and the site is registered as a Shibboleth Service Provider (SP) it should just be a matter of setting authType shibboleth in a HTTPS virtual host definition.

Currently only works for Debian and Ubuntu.

http://shibboleth.net/

This is a duplicate of #96 but from the correct branch.