More descriptive variable name + words

- named product_tags so that it can scale to non food related places
- ie. whatever the facility produces to the consumer can be tagged as
such

Closes #40
3 jobs for 40-facility-food-tags in 1 minute and 5 seconds (queued for 1 second)
Status Name Job ID Coverage
  Test
passed whats-open-py2.7 #3022

00:01:01

passed whats-open-py3.5 #3023

00:01:04

passed whats-open-py3.6 #3024

00:01:04