Feature request: a switchable 80 characters/columns guideline in the markdown editor

[websafe]

It would probably be nice to have a guideline at 80 (or any defined) character/column in the markdown editor...

[joemccann]

Is this configurable in Ace Editor?

[js-kyle]

This is configurable in ace editor, Dillinger sets it to false here https://github.com/joemccann/dillinger/blob/master/public/js/base/base.controller.js#L29

Could be a nice toggle feature

[joemccann]

should we add this?