Reload commits before publishing mail about them

This fixes this, which only crops up some of the time:

```
Daemon 39827 STDE [Thu, 04 Jun 2015 03:03:11 +0000] [2015-06-04 03:03:10] EXCEPTION: (PhutilProxyException) Error while executing Task ID 902271. {>} (PhabricatorDataNotAttachedException) Attempting to access attached data on PhabricatorRepositoryCommit (via getCommitData()), but the data is not actually attached. Before accessing attachable data on an object, you must load and attach it.
Daemon 39827 STDE [Thu, 04 Jun 2015 03:03:11 +0000]
Daemon 39827 STDE [Thu, 04 Jun 2015 03:03:11 +0000] Data is normally attached by calling the corresponding needX() method on the Query class when the object is loaded. You can also call the corresponding attachX() method explicitly. at [<phabricator>/src/infrastructure/storage/lisk/PhabricatorLiskDAO.php:166]
Daemon 39827 STDE [Thu, 04 Jun 2015 03:03:11 +0000] arcanist(head=master, ref.master=8c589f1f759f), phabricator(head=master, ref.master=4a45620b0458), phutil(head=master, ref.master=afc05a9a7f00)
Daemon 39827 STDE [Thu, 04 Jun 2015 03:03:11 +0000]   #0 <#2> PhabricatorLiskDAO::assertAttached(string) called at [<phabricator>/src/applications/repository/storage/PhabricatorRepositoryCommit.php:129]
Daemon 39827 STDE [Thu, 04 Jun 2015 03:03:11 +0000]   #1 <#2> PhabricatorRepositoryCommit::getCommitData() called at [<phabricator>/src/applications/audit/editor/PhabricatorAuditEditor.php:669]
Daemon 39827 STDE [Thu, 04 Jun 2015 03:03:11 +0000]   #2 <#2> PhabricatorAuditEditor::buildMailBody(PhabricatorRepositoryCommit, array) called at [<phabricator>/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php:2178]
Daemon 39827 STDE [Thu, 04 Jun 2015 03:03:11 +0000]   #3 <#2> PhabricatorApplicationTransactionEditor::sendMailToTarget(PhabricatorRepositoryCommit, array, PhabricatorMailTarget) called at [<phabricator>/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php:2152]
Daemon 39827 STDE [Thu, 04 Jun 2015 03:03:11 +0000]   #4 <#2> PhabricatorApplicationTransactionEditor::sendMail(PhabricatorRepositoryCommit, array) called at [<phabricator>/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php:998]
Daemon 39827 STDE [Thu, 04 Jun 2015 03:03:11 +0000]   #5 <#2> PhabricatorApplicationTransactionEditor::publishTransactions(PhabricatorRepositoryCommit, array) called at [<phabricator>/src/applications/transactions/worker/PhabricatorApplicationTransactionPublishWorker.php:21]
Daemon 39827 STDE [Thu, 04 Jun 2015 03:03:11 +0000]   #6 <#2> PhabricatorApplicationTransactionPublishWorker::doWork() called at [<phabricator>/src/infrastructure/daemon/workers/PhabricatorWorker.php:91]
Daemon 39827 STDE [Thu, 04 Jun 2015 03:03:11 +0000]   #7 <#2> PhabricatorWorker::executeTask() called at [<phabricator>/src/infrastructure/daemon/workers/storage/PhabricatorWorkerActiveTask.php:162]
Daemon 39827 STDE [Thu, 04 Jun 2015 03:03:11 +0000]   #8 <#2> PhabricatorWorkerActiveTask::executeTask() called at [<phabricator>/src/infrastructure/daemon/workers/PhabricatorTaskmasterDaemon.php:20]
Daemon 39827 STDE [Thu, 04 Jun 2015 03:03:11 +0000]   #9 PhabricatorTaskmasterDaemon::run() called at [<phutil>/src/daemon/PhutilDaemon.php:185]
Daemon 39827 STDE [Thu, 04 Jun 2015 03:03:11 +0000]   #10 PhutilDaemon::execute() called at [<phutil>/scripts/daemon/exec/exec_daemon.php:125]
```

Auditors: btrahan

src/applications/audit/editor/PhabricatorAuditEditor.php

@@ -673,12 +673,6 @@ final class PhabricatorAuditEditor
         $object);
     }
 
-    // Reload the commit to pull commit data.
-    $commit = id(new DiffusionCommitQuery())
-      ->setViewer($this->requireActor())
-      ->withIDs(array($object->getID()))
-      ->needCommitData(true)
-      ->executeOne();
     $data = $commit->getCommitData();
 
     $user_phids = array();
@@ -999,4 +993,13 @@ final class PhabricatorAuditEditor
     return $this;
   }
 
+  protected function willPublish(PhabricatorLiskDAO $object, array $xactions) {
+    return id(new DiffusionCommitQuery())
+      ->setViewer($this->requireActor())
+      ->withIDs(array($object->getID()))
+      ->needAuditRequests(true)
+      ->needCommitData(true)
+      ->executeOne();
+  }
+
 }