ruckus/quickbooks-ruby — pull request #170 by ahey (2014-10-16 11:29:13+00:00)
Title: Add exchange_rate and home_total_amount to the invoice model

These fields are only present in invoices from non-USA QB accounts, [invoice reference here](https://developer.intuit.com/docs/0025_quickbooksapi/0050_data_services/030_entity_services_reference/invoice).