Don't load Podcast content unless necessary (inside cache)
Require concerns at initialization

This fixes a bug where "Concern::Validation" hadn't yet been loaded, so
for classes which didn't call it at all (like Edition), the instance
methods defined within InstanceMethods hadn't yet been included into
ActiveRecord.
Update autosave alert text
Byebye Baca, hello Geordi. Butterfly in the skyyyyyy... Engage
add homepage leaderboard
Add targeting for health and obamacare pages
Spacing cleanup