Adds orders, order_items, companies.
Deletes json.builders
Skeleton is functional.

No input checks, no accounting for gapped information, no dependency
deletion upon deletion of objects. But if you touch it “just” right, it
all works.
Adds to seeds.rb. Moves helpers to the model.
Merge branch 'payment-setup' into adam-steel
Merge pull request #6 from DenglSteel/adam-steel

Adam steel