* Add typeWatcher for search form
* Replace `strlen` to `mb_strlen`, because we limit count of chars rather than count of bytes

* Fix search for students by 1-2 letters and with group filter

it-lab/grade#29 (comment 111)

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

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

Field Model_Factory::ID came public, new method getStudents() added.
Renamed Model_Students::searchStudents() to search(); removed duplicate method NotAttendingDiscipline().

+ Code refactoring in the AdmStudent controller

That's why a conflict occurs when a class has two functions with the same name.

+ Dynamic factory method was removed (improves static code analysis)
+ One file instead of several: Class/DataArr/Students.php, Model/Admin/Students.php and Model/DataArr/Students.php