change user role
add new category filter
add filter paterns
add validation in jsp
Merge branch 'master' into ivan

Conflicts:
	SSEL/src/main/java/com/softserve/dao/impl/SubjectDaoImpl.java
	SSEL/src/main/resources/messages_en.properties
	SSEL/src/main/resources/messages_ru.properties
	SSEL/src/main/resources/messages_ua.properties
	SSEL/src/main/webapp/resources/styles/styles.css
change social
add js validation
:wq