Adding in InvoiceItems, Shipments, and ShipmentItems.
Merge pull request #5 from apruve/AP-5505 Ap 5505 - adding invoiceItems, shipment, shipmentItems, and changing the watchr
Merge pull request #5 from apruve/AP-5505 Ap 5505 - adding invoiceItems, shipment, shipmentItems, and changing the watchr