Yoast/wordpress-seo — pull request #1295 by dannyvankooten (2014-07-06 15:45:55+00:00)
Title: Move instantiation of WPSEO_Sitemaps class to frontend-only.

Noticed that `WPSEO_Sitemaps` was instantiated for all requests while it is not necessary for AJAX or Admin requests, afaik. This PR moves class instantiation to the `wpseo_frontend_init` hook.