Merge branch 'refactor-paper' into 'DEV'

MOD: fix bug







See merge request !47

mooctest-site-server/src/main/java/cn/iselab/mooctest/site/dao/PaperDao.java

@@ -13,6 +13,4 @@ import javax.transaction.Transactional;
 public interface PaperDao extends PagingAndSortingRepository<Paper, Long> {
 
     Paper findById(long paperId);
-
-    Paper create(Paper paper);
 }