DATAREST-883 - Polishing.

Switched to use @RequiredArgsConstructor where possible. Slightly rearranged test cases. Inlined JacksonMappingAwareSortTranslator to not expose it as bean unless necessary. Use static Jackson BeanClassIntrospector to avoid unnecessary recreation.

Original pull request: #222.

spring-data-rest-webmvc/src/test/java/org/springframework/data/rest/webmvc/json/SortTranslatorUnitTests.java

@@ -30,6 +30,7 @@ import com.fasterxml.jackson.databind.ObjectMapper;
  * Unit tests for {@link JacksonMappingAwareSortTranslator.SortTranslator}.
  *
  * @author Mark Paluch
+ * @author Oliver Gierke
  * @soundtrack dkn - Out Of This World (original version)
  */
 public class SortTranslatorUnitTests {