closes #7 Client modules naming

pom.xml

spring-petclinic-api-gateway/pom.xml

spring-petclinic-customers-service/pom.xml

...ples/petclinic/customers/CustomersServiceApplication.java

...samples/petclinic/customers/application/OwnerService.java

...k/samples/petclinic/customers/application/PetService.java

...petclinic/customers/boundary/web/owner/OwnerResource.java

...les/petclinic/customers/boundary/web/pet/PetResource.java

...es/petclinic/customers/boundary/web/pet/PetValidator.java

...work/samples/petclinic/customers/domain/model/Person.java

...samples/petclinic/customers/domain/model/owner/Owner.java

...tclinic/customers/domain/model/owner/OwnerRepository.java

...ork/samples/petclinic/customers/domain/model/pet/Pet.java

...s/petclinic/customers/domain/model/pet/PetRepository.java

...samples/petclinic/customers/domain/model/pet/PetType.java

...k/samples/petclinic/customers/support/jpa/BaseEntity.java

.../samples/petclinic/customers/support/jpa/NamedEntity.java

...clinic-customers-service/src/main/resources/bootstrap.yml

...c-customers-service/src/main/resources/db/hsqldb/data.sql

...customers-service/src/main/resources/db/hsqldb/schema.sql