Paginate token leader board.

Summary: Add pagination to leader board. Add key on token count in db.

Test Plan: Set page size to 1 and give tokens to two tasks.

Reviewers: epriestley, AnhNhan

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D5513

resources/sql/patches/20130321.token.sql

···
+ALTER TABLE {$NAMESPACE}_token.token_count
+  ADD KEY `key_count` (tokenCount);

src/applications/tokens/controller/PhabricatorTokenLeaderController.php

···
   public function processRequest() {
     $request = $this->getRequest();
     $user = $request->getUser();
-    $pager = id(new AphrontCursorPagerView())
-      ->readFromRequest($request);
+
+    $pager = new AphrontPagerView();
+    $pager->setURI($request->getRequestURI(), 'page');
+    $pager->setOffset($request->getInt('page'));
 
     $query = id(new PhabricatorTokenReceiverQuery());
-    $objects = $query->setViewer($user)->execute();
+    $objects = $query->setViewer($user)->executeWithOffsetPager($pager);
     $counts = $query->getTokenCounts();
 
     $handles = array();

src/infrastructure/storage/patch/PhabricatorBuiltinPatchList.php

···
         'type'    => 'sql',
         'name'    => $this->getPatchPath('20130317.phrictionedge.sql'),
       ),
+      '20130321.token.sql' => array(
+        'type'    => 'sql',
+        'name'    => $this->getPatchPath('20130321.token.sql'),
+      ),
       '20130310.xactionmeta.sql' => array(
         'type'    => 'sql',
         'name'    => $this->getPatchPath('20130310.xactionmeta.sql'),