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

Релиз 2.0.3

See merge request !90

* 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`

* Fix path to handler with news

* Add external keys to departments table and update inserting teacher API
* Add ability to set department by External ID
* Refactor error handling in teacher api
* Update description of the method
* Add functions for creating activated (from 1C) teachers
* Add ability to fire teachers
* Add status and INILA (Insurance Number) to teacher's table
* Extract stored migrations about departments and jobs to dedicated file and rename them