CourseRequest working test added. For Teacher tests doesnt work.
 Changes to be committed:
	new file:   school-dao/src/main/java/school/dao/implementation/CourseRequestImpl.java
	modified:   school-dao/src/main/java/school/dao/implementation/StudentDaoImpl.java
	new file:   school-dao/src/main/java/school/dao/implementation/TeacherDaoImpl.java
	new file:   school-dao/src/test/java/school/dao/implementation/CourseRequestImplTest.java
	modified:   school-dao/src/test/java/school/dao/implementation/StudentDaoImplTest.java
	new file:   school-dao/src/test/java/school/dao/implementation/TeacherDaoImplTest.java
	modified:   school-model/src/main/java/school/model/Teacher.java