Sell campaigns by CPM.
Delete update_bid.

It did too much and was called in several templates where it did nothing.
Delete unused update_box.
Implement fetch-trackers and click routes.
Use an ad server to select promos for spotlight.

Replaces client side weighted random selection.
adzerk specific updates for spotlight
starting to move adzerk ids to config

NOTE: need to update example.ini
adzerk selfserve
Add hooks in promote.