renderComponentToString() rendering a different data-reactid on each run

Whenever I run renderComponentToString() on my backend it returns components with different `data-reactid`'s on each run. How can I change my backend to render `data-reactid`'s + checksums?

[This is my `index.js` template.](https://gist.github.com/yoshuawuyts/65c798e241d63b45aaec)
