Refactor.
Update webapp.
Refactor packages.
Fix servlet properties.
Merge remote-tracking branch 'origin/master'

Conflicts:
	BigDataCourse/webapp/src/main/java/com/mirantis/aminakov/bigdatacourse/HelloController.java
	BigDataCourse/webapp/src/main/webapp/WEB-INF/jsp/index.jsp
	BigDataCourse/webapp/src/main/webapp/WEB-INF/jsp/view.jsp
	BigDataCourse/webapp/src/main/webapp/WEB-INF/webapp-servlet.xml
	BigDataCourse/webapp/src/test/java/com/mirantis/aminakov/bigdatacourse/HelloControllerTest.java
Merge remote-tracking branch 'origin/master'
...