public function toggle($skill_id)
 {
     $skill = Skill::where('id', $skill_id)->select('id', 'current')->first();
     $skill->current = !$skill->current;
     if ($skill->save()) {
         return Response::json($skill);
     }
     return Response::json(['message' => 'There was a problem updating the skill.'], 400);
 }