add classes:
1.Student
2.Lecturer
3.Grade
4.Checker
add function "valid_password" to User class
and change password type to String
Merge branch 'lior' of https://github.com/aglos/A-Smart-Lecturer into Ohad's-branch
try to get AJAX work with new db :(
new functions work with ajax. need to find out how to pass circle/course
id to the drop lists in checker page (should be implemeted in
ExerciseFilter.jsg -> (for) -> value should be the id
login page functionality. not finished but working! :D