hello
Add safe delete support
new dump and safe delete
Merge branch 'master' into roma

Conflicts:
	SSEL/src/main/java/com/softserve/dao/CourseSchedulerDao.java
	SSEL/src/main/java/com/softserve/dao/impl/CourseSchedulerDaoImpl.java
	SSEL/src/main/java/com/softserve/entity/Group.java
	SSEL/src/main/java/com/softserve/service/CourseSchedulerService.java
	SSEL/src/main/java/com/softserve/service/impl/CourseSchedulerServiceImpl.java
Code refactoring, add new changeset to liquibase 3.0