US-17: first step
US-17: second step
US-17: third step
US-17: fourth step
US-17: fifth step
US-17: sixth step
US-17: seventh step
Merge branch 'us17' of https://github.com/migunovAlex/examScheduler into us17
US-17: eigth step
US-17: User Session Component && US-13: Persist User session while log in.