Define contract for creating SOAP clients with WSDLs

src/main/edu/wisc/services/cbs/api/SoapService.php

...wisc/services/cbs/order/header/SoapOrderHeaderService.php

...ces/cbs/order/interfacing/SoapOrderInterfacingService.php

...edu/wisc/services/cbs/order/line/SoapOrderLineService.php

...sc/services/cbs/order/payment/SoapOrderPaymentService.php

src/main/edu/wisc/services/cbs/price/SoapPriceService.php

...main/edu/wisc/services/cbs/product/SoapProductService.php

...sc/services/cbs/order/header/SoapOrderHeaderServiceIT.php

...cbs/order/interfacing/SoapOrderInterfacingServiceTest.php