[112] scc & shangfei modify the users.jsp for authorise regular user to administrator
[112] scc & shangfei  add a userRole attribute to class User for view roleName in users
[112] scc & shangfei add authorise test for UserController
[112] scc & shangfei add authorise method for response to the arrow click
[112] scc & shangfei modify setUsersIsRegular method for set userRole:Administrator/User of user in UserServiceImpl.java
[112] scc & shangfei add test for getByUserId and authriseUserRole method of UserRoleMapper
modify authoriseRoleName method for the correct database operation
modify test for the authoriseUserRole
Merge branch 'master' of https://github.com/freddie218/bbs_team_b