+0.05 unreleased
+ -merge in s5's changes; bump version to 0.05 to skip unreleased versions
+ -add some additional error numbers
+ -pass and return order_number (BILL_ITEM_ID)
+ -support "credit" action in addition to "normal authorization"
+ -support properly named "echeck" type (also support incorrect "check"
+ type still, so as not to break existing applications)
+ -pass PS_TXN_TYPE field type to jettis
+ -pass customer_ssn as SSN4
+ -pass bogus DL_NUM and DL_STATE info (XXX wtf?)
+