Gold partners: update Homejoy description
compact: Fix .cover to be overylayed over the whole screen.
Fixed a bug if the <head> isn't in the first 1kb.
/dev/api: Document usage of gilded userpage tab
Fix typo in refund_campaign.
Pass billable_impressions to refund_campaign.
refund_campaign handles refund calculation.
get_billable_amount round down to nearest penny.