implement pubsubhubbub subscriber (update schema)

config.php-dist

@@ -18,10 +18,6 @@
 	define('MAGPIE_CACHE_DIR', 'cache/magpie');
 	// Local cache directory for RSS feeds
 
-	define('MAGPIE_CACHE_AGE', 60*30); 
-	// How long to store cached RSS objects? In seconds.
-	// Defaults to 30 minutes
-
 	define('ICONS_DIR', "icons");
 	define('ICONS_URL', "icons");
 	// Local and URL path to the directory, where feed favicons are stored.