added code to view all articles when admin is loged in but only approved ones when normal user is loged in.
non-admins cannot edit course, disability and university.
changed redirects for when impairments and educations were modified. gave more user-friendly messages upon editing of impairment and educations. added edit links for user to edit education and impairment records.
fixed radio buttons in the impairment forn.
added view link next to each education record. Tidied up education show page.
changed rating columns in educations table to integers, changed rating columns in university to decimal(3, 2).
added the ability to rate a university and show the average on the university page.