Added #get shortcut.

Infers internal ID hash when a non-Hash is passed to #get
Assign internal ID when record creation is successful
Switched namespace to eliminate soap error from sandbox netsuite
Doc updates
wip: create SalesOrder classes and specs
Allow adding items in SalesOrder

following same pattern as Invoice
Model SalesOrderItem & List the same wasy as InvoiceItem & List
Adding the order_status field to SalesOrder
Fixing miscategorized & missing fields on Sales Order
Fixing specs to pass with recent Invoice + SalesOrder changes
Version bump