[ticket/14484] Move facebook/webdriver back to tests dir composer.json

This will make sure we don't try to install it to incompatible PHP 5.3.3.

PHPBB3-14484

travis/install-phpbb-test-dependencies.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+#
+# This file is part of the phpBB Forum Software package.
+#
+# @copyright (c) phpBB Limited <https://www.phpbb.com>
+# @license GNU General Public License, version 2 (GPL-2.0)
+#
+# For full copyright and license information, please see
+# the docs/CREDITS.txt file.
+#
+set -e
+set -x
+
+cd tests
+php ../composer.phar install --dev --no-interaction --prefer-source
+cd ..