Add 8 more project images to builtins

Summary: More pretty images.

Test Plan: Set a robot as image for security project. So pretty.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D18191

src/applications/project/controller/PhabricatorProjectEditPictureController.php

···
     }
 
     $builtins = array(
+      'projects/v3/book.png',
       'projects/v3/bug.png',
       'projects/v3/calendar.png',
+      'projects/v3/clipboard.png',
       'projects/v3/cloud.png',
       'projects/v3/creditcard.png',
       'projects/v3/database.png',
···
       'projects/v3/experimental.png',
       'projects/v3/flag.png',
       'projects/v3/folder.png',
+      'projects/v3/lightbulb.png',
       'projects/v3/lock.png',
       'projects/v3/mail.png',
+      'projects/v3/marker.png',
       'projects/v3/mobile.png',
       'projects/v3/organization.png',
       'projects/v3/people.png',
+      'projects/v3/piechart.png',
+      'projects/v3/robot.png',
+      'projects/v3/rocket.png',
       'projects/v3/servers.png',
+      'projects/v3/sitemap.png',
       'projects/v3/tag.png',
       'projects/v3/trash.png',
       'projects/v3/truck.png',