enable seo redirects in core.php

Summary:
WEB-364 #fixed
enable seo redirects in core.php

Test Plan: test on stage now that SEO redirects is landed in the main repos

Reviewers: #everyone, gwarner

Reviewed By: #everyone, gwarner

Differential Revision: https://dev.blendtec.com/D1598
Merge branch 'develop' into different-mems