Display revision number in history

Test Plan:
Displayed repository.
Displayed repository history.
Wondered that we actually have bunch of commits without a revision.
Displayed blame.
Didn't display merge commit.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D2840

src/applications/diffusion/controller/DiffusionCommitController.php

@@ -682,6 +682,7 @@ final class DiffusionCommitController extends DiffusionController {
     $history_table = new DiffusionHistoryTableView();
     $history_table->setDiffusionRequest($drequest);
     $history_table->setHistory($merges);
+    $history_table->loadRevisions();
 
     $phids = $history_table->getRequiredHandlePHIDs();
     $handles = id(new PhabricatorObjectHandleData($phids))->loadHandles();