DATACMNS-1259 - Polishing.

Refactored lambdas to method references. Simplified type parameter. Added comment to test to indicate related issue.

Original pull request: #273.

src/test/java/org/springframework/data/auditing/MappingAuditableBeanWrapperFactoryUnitTests.java

@@ -163,7 +163,7 @@ public class MappingAuditableBeanWrapperFactoryUnitTests {
 				ThreeTenBackPortConverters.LocalDateTimeToJsr310LocalDateTimeConverter.INSTANCE.convert(reference));
 	}
 
-	@Test
+	@Test // DATACMNS-1109
 	public void exposesInstantAsModificationDate() {
 
 		SampleWithInstant sample = new SampleWithInstant();