Store feeds in memcached rather than on a filesystem.

Store feeds in memcached rather than on a shared filesystem.

The idea here is not to generate a page and store it in a filesystem but to have the atom.xml generated dynamically (cached by squid as well), with as much of the contents of the feed being cached in memcached.

Functionally I am going to sneak in more works in a feed cached, set the default to be the same as it is right now to display but allow it to be overridden with a parameter.

How to test:

We'd probably want some fairly extensive testing in several feed readers, as well as a DW and tumblr implementation to see if it does anything weird, like duplicate entries between polls. This will have to be a set up, test, post, test, walk away for at least a day, test again because of the inherent time delay in feeds.