Shopify/active_merchant — pull request #1351 by louiskearns (2014-08-20 03:08:43+00:00)
Title: add track data support to merchant warehouse

Adding track data support to merchant warehouse per their [docs](https://ps1.merchantware.net/Merchantware/ws/RetailTransaction/v4/Credit.asmx?op=PreAuthorization).

Please review @odorcicd @melari
cc @davidseal