Pagination, sorting and styles for group was added
 Changes to be committed:
	modified:   ext-resources/DB_FILL.sql
	modified:   school-dao/src/main/java/school/dto/StudentDTO.java
	modified:   school-service/src/main/java/school/service/GroupService.java
	modified:   school-service/src/main/java/school/service/implementation/GroupServiceImpl.java
	modified:   school-web/src/main/java/school/controller/GroupEditController.java
	new file:   school-web/src/main/webapp/resources/css/base-pagination.css
	modified:   school-web/src/main/webapp/resources/css/group-edit.css
	modified:   school-web/src/main/webapp/resources/css/main.css
	modified:   school-web/src/main/webapp/resources/js/group-edit.js
	renamed:    school-web/src/main/webapp/resources/js/utils/pagination.js -> school-web/src/main/webapp/resources/js/utils/pagination-multiply.js
	modified:   school-web/src/main/webapp/resources/js/utils/pagination.js
	modified:   school-web/src/main/webapp/views/groups/head-teacher-edit.jsp
	modified:   school-web/src/main/webapp/views/groups/head-teacher.jsp
	modified:   school-web/src/main/webapp/views/groups/student.jsp
Merge branch 'master' of https://github.com/vsomov/SchoolPortal