added classmaster to autologin
added mastersheet controller
moved classmenu logic from MainCtrl to ClassmenuCtrl
added classmenuCtrl.js
moving logic out of mainCtrl to mastersheetCtrl
removed mainCtrl as default controller
moved user login dropdown logic from MainCtrl to NavtabsCtrl
Fixed bug: classmaster unneccesarily saving marksheets onload
made save private. services should now use saveLater. this will eventually be replaced with promises
added class menu to the promotion view
fixed null value error. averages are now divided over coeffs for only those subjects in which the student has a non-null score