I think the parent commenter meant as a selectable runtime at deployment time (i.e. directly supported), rather than requiring the bring-your-own-runtime setup that is currently required.
Your subheading text "Build and publish instantly your projects online" reads a little strangely to me. I'd recommend re-wording that to "Build and instantly publish your projects online".
I think that's debatable... with the currently humongous list of available plugins and it's project-focused interface, I don't think it's much of a stretch at this point to identify it as a lightweight IDE.
Interesting... my corporate firewall flags your site with an adult-and-pornography filter. Did you recently purchase the domain from someone who may have been running a different type of site? :)
Quick suggestion: rather than having your headers return 'Access-Control-Allow-Origin' '*';, you're better off echoing the requesting domain back, so that in the future you'll be able to maintain a whitelist of registered domains. Prevents usage from any-old-domain (though I realize you have authorization already built into some parts of your API).
Check out Black Sails, there's a scene in one of the later episodes of the season that portrays the measurement of speed using the chip board and knotted rope. The term "knot" immediately clicked for me when I saw that.