public function vote($id)
{
$tutorial = Tutorial::findOrFail($id);
// +1 or -1
$voteValue = Input::get('vote');
$vote = Vote::firstOrNew(['user_id' => Auth::id(), 'voteable_id' => $id, 'voteable_type' => 'Tutorial']);
$vote->vote = $voteValue;
$vote->save();
return Redirect::back();
}
