added recommendation on specifying item price as amountIncVat and vatPercent to 5.1
empty node error fix in xml
INT-553, INT-554 Case A and C
INT-555 case E
INT-556 case mixed orderrows
documented required setInvoiceDistributionType() method
Merge branch 'develop' of https://github.com/sveawebpay/php-integration into develop
INT-558 case ordertype vat missmatch
fixed UpdateOrderRowsRequest
INTG-559 updateOrderrows rounding case A
INTG-560 updateOrderrows rounding case C
INTG-561 updateOrderrows rounding case E
INTG-562 updateOrderrows rounding case mixed orderrows
INTG-563 updateOrderrows rounding case ordertype missmatch
INTG-564 queryOrderRow rounding Response
INTG-570 getPaymentPlanParams if only one campaign
Merge branch 'feature/sprint5' into develop
improved documentation on WebPayAdmin::XXXOrderRows-functions
added missing unit tests of validation and integration tests for functionality for WebPayAdmin::XXXOrderRows-functions
updated gh-pages documentation