Delete user_event model and clean code
Add offset for notifications view
Add migration for user last activity. #87
Set last user activity on each action. #87
Add user controller. See #87 #117
Add getIsOnline method to user model
Implement userlist view. Close #117
Make users page as home
Implement user's logout after he was blocked. Close #82
Checking users is moved to pjaxController instead of using it in each
controller
Fix link 'Home' in main menu
Add pjax-paremetr to calendar links.
Merge https://github.com/boo1ean/network
Fix after file was uploaded button 'download' stay inactive. Closes #111
Add migration with update to the datetime format taken and returned fields.
Add migration with update  status field format to the integer.
Update code for integer constant of the books status.
update link value to null if link was not generated
Implement delete feature to the library on administrative side.
Update server errors message in JS functions