!42 添加分页构造方法重载

Merge pull request !42 from 炮灰/dev

mybatis-plus-support/src/main/java/com/baomidou/mybatisplus/plugins/Page.java

@@ -56,6 +56,11 @@ public class Page<T> extends Pagination {
         this.setOrderByField(orderByField);
     }
 
+	public Page(int current, int size, String orderByField, boolean isAsc) {
+        this(current, size, orderByField);
+        this.setAsc(isAsc);
+    }
+
     public List<T> getRecords() {
         return records;
     }