* Add ids to buttons in sync page

* Introduce migration with stored procedures for gathering statistics
* Add new category in admin panel for statistics
* Add Chart.js for drawing data

* Fix Departments_Get procedure name
* Update version in package.json and fix warnings about missing some information in the file
* Add nginx config file
* Fix count form for JobPosition_Create method
* Fix names of db migrations
* Extract error handling function for page with tokens
* Fix comment for auth tokens handler controller
* Add comment about field `status` in Teacher's model and rename the corresponding parameter in `changeInfo` to `isWorking`