Checkstyle error corrections
Merge branch 'checkstyle'

Conflicts:
	webshop/src/main/java/de/webshop/artikelverwaltung/service/ArtikelService.java
	webshop/src/main/java/de/webshop/bestellverwaltung/domain/Bestellung.java
	webshop/src/main/java/de/webshop/bestellverwaltung/service/PositionServiceImpl.java
	webshop/src/main/java/de/webshop/kundenverwaltung/rest/KundeResource.java
	webshop/src/main/java/de/webshop/util/Mock.java