+ Font awesome icons
+ Split js code into functions
+ Improved appearance

- Complex report optimization
- Max rate calculation optimization

- Login filtering
- Complex enter key behaviour
- Process loading icon

Client js tried to get (incorrectly) discipline id from URL and got error at the server side.

it-lab/grade#29 (comment 111)

* Integration of drag-drop zone
* Some examples about new file structure

Server had been returning number of affected rows minus one: either 0, or -1. This value is converted to bool (res == 0), and js displayed an error.

`Igor Strebezhev` & `Strebezhev Igor` returns the same result

* Renamed AdmStudents -> Students
* New func Students::search()

Moved `changeLogin` to Model_Account