Ghosted Update - V.0.5.7

XML Sitemaps are now supported, take a look at the original Ghost.org Quote:

Two months ago we added custom post meta to Ghost by default so that you can customise the data which you send to these places. A month ago, we added structured data support, so that social networks and search engines are able to read your custom post meta more easily.

Today, we're introducing automatic XML sitemaps as core functionality within Ghost to take this another step further.