Css fix, Course service addition functions was added, schedule was added to db-fill file.
 Changes to be committed:
	modified:   ext-resources/db_filling_up
	modified:   school-dao/src/main/java/school/dao/CourseDao.java
	modified:   school-dao/src/main/java/school/dao/implementation/CourseDaoImpl.java
	modified:   school-dao/src/test/java/school/dao/implementation/CourseDaoImplTest.java
	modified:   school-model/src/main/java/school/model/Course.java
	modified:   school-service/src/main/java/school/service/CourseService.java
	renamed:    school-service/src/main/java/school/service/StudentService.java -> school-service/src/main/java/school/service/GroupService.java
	modified:   school-service/src/main/java/school/service/implementation/CourseServiceImpl.java
	renamed:    school-service/src/main/java/school/service/implementation/StudentServiceImpl.java -> school-service/src/main/java/school/service/implementation/GroupServiceImpl.java
	modified:   school-service/src/test/java/school/service/implementation/ConversationServiceImplTest.java
	renamed:    school-service/src/test/java/school/service/implementation/StudentServiceImplTest.java -> school-service/src/test/java/school/service/implementation/CourseServiceImplTest.java
	modified:   school-web/src/main/java/school/controller/CourseController.java
	renamed:    school-web/src/main/java/school/controller/StudentController.java -> school-web/src/main/java/school/controller/GroupController.java
	modified:   school-web/src/main/webapp/resources/css/main.css