eliott authored May 28, 2011 and Lukas Fleischer committed Jun 22, 2011

utilize the apc cache functionality in aur.inc to cache the rss feed
output. the cache will cache on a per-protocol basis (http/https) so
that urls are appropriate regardless of which url people hit.

Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>