Add pry-theme gem
Change error message
Add ownerships table
Add shipments table
Revert "Add pry-theme gem"

This reverts commit f31f0bc1cfb1b55201398fc4ead723a0622393a0.
Add Ownership model
Add Shipment model
Add fulfillments table
Add Fulfillment parent class
Add OnlineFulfillment child class
Add ShippingFulfillment child class
Minor updates