Implemented automatic login of last successful user
Replaced KVO-based system with NSNotification-based one
Some consistency fixes
Fixed bug with scrolling chat to the bottom

Added condition that takes into account case when chat window is empty
and needs to update.
Merge branch 'notif' into develop
Added dummy plus signs to settings views
Removed excessive argument from shouldUpdatInfo method
Remove focus from textEdits in views that are not visible
Started workign on photos at chat selection screen
Added observing of user logout notification
Fixed images not updating in chat selection view
Refactored and commented AuthorizationManager
Fixed checkAuthorization check on app start
Cleaned up settings view controllers
Fixed AuthorizationManager not fetching images
Added triangles to chat bubbles
Fixed user photo in navigation bar
Added unread message indicators
Added dummy online indicator
Fixed the case when an empty age field would crash the app