Scale reward for unique users

[DeaconDesperado]

Right now, pulls are saved on a per-cookie basis.

We should also scale clicks/reward by unique users for a more accurate underlying reflection.

This could be accomplished by making storage of the bandit outcomes an FSM, where only the first STORED state (as represented in the debug headers) is utilized to trigger a reward.

A flag could be added to the json cookie to filter potential rewards.