DATACMNS-1074 - Removed reference to JDK 8 method.

Method.isDefault() is JDK 8 API. Replaced by our JDK 6 equivalent in ReflectionUtils.

Original pull request: #221.

src/main/java/org/springframework/data/projection/DefaultMethodInvokingMethodInterceptor.java

@@ -52,7 +52,7 @@ public class DefaultMethodInvokingMethodInterceptor implements MethodInterceptor
 
 		Method method = invocation.getMethod();
 
-		if (!method.isDefault()) {
+		if (!org.springframework.data.util.ReflectionUtils.isDefaultMethod(method)) {
 			return invocation.proceed();
 		}