Add vim modelines to all files.

Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>

smoketests/extractStyleBlocks.php

@@ -67,4 +67,7 @@ foreach ($purifier->context->get('StyleBlocks') as $style) {
   <input type="submit" value="Submit" />
 </form>
 </body>
-</html>
+</html>
+<?php
+
+// vim: et sw=4 sts=4