commit #10 - updating entities and repositories, completing student reqs 3,8,9,10,11

...pi/src/main/java/com/diss/omppapp/api/AuthController.java

...src/main/java/com/diss/omppapp/api/StudentController.java

.../main/java/com/diss/omppapp/api/SubmissionController.java

.../main/java/com/diss/omppapp/configurations/WebConfig.java

...va/com/diss/omppapp/configurations/WebSecurityConfig.java

...src/main/java/com/diss/omppapp/entities/AnswerEntity.java

...va/com/diss/omppapp/entities/ClassMinutePapersEntity.java

.../java/com/diss/omppapp/entities/ClassMinutePapersKey.java

...ain/java/com/diss/omppapp/entities/MinutePaperEntity.java

...c/main/java/com/diss/omppapp/entities/QuestionEntity.java

...main/java/com/diss/omppapp/entities/SubmissionEntity.java

...com/diss/omppapp/repositories/AnswerEntityRepository.java

.../com/diss/omppapp/repositories/ClassEntityRepository.java

...ppapp/repositories/ClassMinutePapersEntityRepository.java

...m/diss/omppapp/repositories/LecturerEntityRepository.java

...iss/omppapp/repositories/MinutePaperEntityRepository.java

.../omppapp/repositories/StudentClassesEntityRepository.java

...om/diss/omppapp/repositories/StudentEntityRepository.java

...diss/omppapp/repositories/SubmissionEntityRepository.java

...java/com/diss/omppapp/services/AuthenticationService.java