Revamped caching framework; allows for seperate settings for browser cache, proxy cache and server cache instructions;

Uses an ariadne store to store metadata about cache images, so it will allow cache images to be marked as stale when templates or object were saved

Cache images that are getting stale (but still good enough to serve) will trigger a cache image regenerate after the request has been served



git-svn-id: https://svn.muze.nl/svn/ariadne-php5/trunk@6514 7882d7ee-46e0-0310-a255-a28a61b628e4