make customerservice4 default again (compatibility with 6.16.3)
see http://www.epages.com/WebService/WebServices_release_6_16_3.html
EPG-34033 - ProductService12 clients + tests
EPG-34033 Check IsMaster flag via WebServices
Merge pull request #14 from ePages-de/feature/findProductByLastUpdate

EPG-34033: Feature/find product by last update