Add a date column to Paste

Summary:
Show modified date on the right of the list view (which I guess
is also the created date, since pastes are immutable?)

Test Plan: Browse through the many volumes of untitled masterworks.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T1600

Differential Revision: https://secure.phabricator.com/D3145

src/applications/paste/controller/PhabricatorPasteListController.php

@@ -362,6 +362,10 @@ final class PhabricatorPasteListController extends PhabricatorPasteController {
             'href' => $file_uri,
           ),
           phutil_escape_html($paste->getFilePHID())),
+
+        phabricator_datetime(
+          $paste->getDateCreated(),
+          $this->getRequest()->getUser()),
       );
     }
 
@@ -374,6 +378,7 @@ final class PhabricatorPasteListController extends PhabricatorPasteController {
         'Language',
         'Title',
         'File',
+        'Created',
       ));
 
     $table->setColumnClasses(
@@ -383,6 +388,7 @@ final class PhabricatorPasteListController extends PhabricatorPasteController {
         null,
         'wide pri',
         null,
+        'right',
       ));
 
     $panel = new AphrontPanelView();