changed authorites from eunm to list of enums

...att2016/v233/SmartMat/controller/user/UserController.java

...java/ntnu/idatt2016/v233/SmartMat/entity/group/Group.java

...u/idatt2016/v233/SmartMat/entity/user/AuthorityTable.java

...n/java/ntnu/idatt2016/v233/SmartMat/entity/user/User.java

...6/v233/SmartMat/repository/user/AuthoritesRepository.java

...u/idatt2016/v233/SmartMat/service/group/GroupService.java

...att2016/v233/SmartMat/service/user/AuthoritesService.java

...tnu/idatt2016/v233/SmartMat/service/user/UserService.java

...va/ntnu/idatt2016/v233/SmartMat/entity/user/UserTest.java

...datt2016/v233/SmartMat/repository/UserRepositoryTest.java

...idatt2016/v233/SmartMat/service/user/UserServiceTest.java