Course Refactoring + some sidebar changes
Changes to be committed:
	modified:   ../school-dao/src/main/java/school/dao/implementation/CourseDaoImpl.java
	modified:   ../school-service/src/main/java/school/service/CourseService.java
	modified:   ../school-service/src/main/java/school/service/implementation/CourseServiceImpl.java
	modified:   src/main/java/school/controller/ControllersUtil.java
	modified:   src/main/java/school/controller/CourseController.java
	modified:   src/main/webapp/resources/css/main.css
	new file:   src/main/webapp/resources/img/logos/1.png
	new file:   src/main/webapp/resources/img/logos/105.png
	new file:   src/main/webapp/resources/img/logos/school-logo.png
	modified:   src/main/webapp/views/tiles/sidebar.jsp
Merge branch 'master' of https://github.com/vsomov/SchoolPortal
 Changes to be committed:
	deleted:    school-web/src/main/webapp/resources/img/logo.png