Heroku cost optimization generic worker v1

remove subsequently. 

We use a family of dynos for each queue. We run 1-20? dynos per queue and different families are on for 750 hours per month at the low end and up to to 40,000 hours per month at the high end.

Lets add a paragraph mentioning we use a home-grown type of autoscaling to dial up and down workers based on the jobs in the queue