title: Allow extra elements in GitLab MD wiki
body: <p>I have a GitLab server, on which various projects are hosted. I want to allow users to embed SVG directly into their wikis using the <code>&lt;SVG&gt;</code> tag. However, they seem to be filtered and do not show up once added to the wiki. </p>
  
  <p>I've found some docs saying that this is because Ruby on Rails has a configurable whitelist of tags. I've looked for 2 configuration files but the ones I could find, and edited, didn't make a difference. Also ran a gitlab-ctl reconfigure to be sure.</p>
  
  <p>Does anyone know how to get <code>&lt;SVG&gt;</code> tags working in the gitlab wikis?</p>