Add Reload Function

[jrusso1020]

Currently our implementation only allows users to get new information based on changes in Newgistics by performing the same query again so something like

original_shipment = Newgistics::Shipment.where(id: 'R577274665').first

described_class.cancel_box(payload)

updated_shipment = Newgistics::Shipment.where(id: 'R577274665').first

expect(updated_shipment.shipment_status).to eq('CANCELED')

With this proposed change we would add in the reload function to our models so that we can perform the following instead of having to query Newgistics again ourselves explicitly

original_shipment = Newgistics::Shipment.where(id: 'R577274665').first

described_class.cancel_box(payload)

expect(original_shipment.reload.shipment_status).to eq('CANCELED')