Don't rely on 3rd party placeholder image service.

The grey one-pixel placeholder.jpg is only 160 bytes anyway.

src/templates/attract/shots/for_project.jade

@@ -35,7 +35,8 @@
 						data-shot-id="{{ shot._id }}",
 						href="{{ url_for('attract.shots.perproject.view_shot', project_url=project.url, shot_id=shot._id) }}",
 						class="status-{{ shot.properties.status }} shot-link")
-						img(src="http://placehold.it/100x60")
+						img(src="{{ url_for('static_attract', filename='assets/img/placeholder.jpg') }}",
+							alt="Thumbnail",width="110",height='60')
 				.table-cell.shot-name
 					a(
 						data-shot-id="{{ shot._id }}",