Remove obsolete live configuration options.
Change frontpage keyword to "-reddit.com".
Move adzerk.js into reddit-init to fix race condition.

This should ensure that the Adzerk postMessage receiver is loaded before
Adzerk gets its payloads.
Adzerk for selfserve.
Use adzerk only for promo requests on beta subreddits.
cpm_beta_srs is in reddit code
percentage goal for non cpm campaigns
percentage goal for legacy campaigns
Impressions must be an int (even if it's a percentage)
when making request to adzerk, convert keywords to lowercase
don't log changes to adzerk objects

object retrieved with GET is missing some attributes so detecting
a change isn't easy.
cleanup some of the adzerk attributes
update PromotionLog when a link or campaign is deactivated
IsActive is based on reddit thing._deleted
better logging (with time)
keywords to lower