Remove VotableInterface from PonderQuestion

Summary: Ref T6920, This removes the PonderVotableInterface from PonderQuestion and assocaited code. Also... never used?

Test Plan: Visit Ponder, See List, New Question, Add Answer.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T6920

Differential Revision: https://secure.phabricator.com/D13833

src/applications/ponder/controller/PonderQuestionViewController.php

@@ -10,14 +10,11 @@ final class PonderQuestionViewController extends PonderController {
       ->setViewer($viewer)
       ->withIDs(array($id))
       ->needAnswers(true)
-      ->needViewerVotes(true)
       ->executeOne();
     if (!$question) {
       return new Aphront404Response();
     }
 
-    $question->attachVotes($viewer->getPHID());
-
     $question_xactions = $this->buildQuestionTransactions($question);
     $answers = $this->buildAnswers($question->getAnswers());