/**
  * Display student list
  *
  * @param  string $filter
  * @return Response
  */
 public function list($filter = '')
 {
     $students = Student::orderBy('last_name', 'asc');
     switch ($filter) {
         case 'admin':
             $students = $students->where('admin', '=', Student::ADMIN_FULL);
             break;
         case 'orga':
             $students = $students->where('orga', '=', true);
             break;
         case 'referral':
             $students = $students->where('referral', '=', true);
             break;
         case 'ce':
             $students = $students->where('ce', '=', true);
             break;
         case 'volunteer':
             $students = $students->where('volunteer', '=', true);
             break;
     }
     $students = $students->get();
     return View::make('dashboard.students.list', ['students' => $students, 'filter' => $filter]);
 }