add file_infos controller,and modify FileInfo model to use jquery file upload. and change routes file to use file_info controller.
copy devise view files to students and professors.
modify fileInfosController to be coping with multiple parents.
removing conflict part.
make notices controller, and add notice resources into course resources.
change authenticate_user! on application controller.
add select_course action and path on students.
catch bug on course.show and courses controller.
drop table scripts, and remove column script_id on problems