1) fix Rating Model
2) sql CreateSubject: restore expected behavior (see todo in commit "Refactoring of subjects upload page" 19.06.15)
3) refactor and disable JavaAuth (see todo)

Conflicts:
	~dev_rating/media/js/rating.js

Not all servers detect HTTP_X_REQUESTED_WITH header.
And now it is possible to load excel files.

1) exam page: hide hidden div with ( json data )
2) update session info on profile/settings changes (User.php)
3) fix profile page model ( Model_Teacher )
4) fix change discipline's control type ( sql )
5) fix sql response in bind group ( repeated binding problem )

Default faculty was not defined by default.

Also renamed $id_name to $ID_FIELD + documentary comments

# Conflicts:
#	~dev_rating/application/bootstrap.php