1.) Added APIs: get_pub_cat_namelist, register_pub_cats, get_default_pub_cat_aggregate, get_personalized_pub_cat_aggregate.  2.) Removed APIs: create_feedcollection, get_feedcollection, get_feedlist 3.) Added Crons: /cron/update_pub_cat_namelist, /cron/pub_cat_aggregates/update