NGINX proxy_pass, WP Githuber MD

To prevent NGINX from crashing if an proxy_pass host can\’t be resolved, cf.

WP Githuber MD WordPress Markdown plugin. Seems to be pretty fast, I think it has too many features (e.g. fetching external images and saving them locally, disabling auto-saves, disabling revisions, etc.). Smart way of saving content though: It saves markdown into the post_content_filtered and the HTML content into post_content.