Use the GitHub API to render Markdown

[rprouse]

It would look a lot better, but need to watch the request limits.

[sharwell]

As long as users are logged in, the request limits are pretty high. As an alternative, I would consider CommonMark.NET. You can parse the markdown to an AST, and then use a custom printer (modeled after the one in CommonMark.NET) which handles the GFM syntax for referencing issues.