DATACMNS-1021 - Add Order.asc(…) and Order.desc(…) factory methods.

We now support Order creation with Order.asc(String) and Order.desc(String) factory methods as shortcut to constructor creation via new Order(Direction, String).

Sort.by(Order.asc("age"), Order.desc("name"));

Deprecated Order(String) constructor in favor of the Order.by(String) factory method. Replace references to new Order(String) with Order.by(String).

Original pull request: #211.

src/main/java/org/springframework/data/web/SortHandlerMethodArgumentResolver.java

@@ -238,7 +238,7 @@ public class SortHandlerMethodArgumentResolver implements SortArgumentResolver {
 			return Optional.empty();
 		}
 
-		return Optional.of(direction.map(it -> new Order(it, property)).orElseGet(() -> new Order(property)));
+		return Optional.of(direction.map(it -> new Order(it, property)).orElseGet(() -> Order.by(property)));
 	}
 
 	/**