Extend fast cache load by memcached support.
Add library to create sitemaps.
Change class file extension from php5 to php for autoloading support.
Extend site controller by sitemap action.
Disabled cache for the moment.
Extend controller by action to deliver sitemap XML. Use query and object cache for performance.
Revert "Extend controller by action to deliver sitemap XML. Use query and object cache for performance."

This reverts commit 475b86555ea42cf4e8c7774e521b8ee90b1a45b6.