Yaml formatting broken in presenter (not editor)

[only1thor]

I noticed that the Yaml formatting was broken (shows html in the "box) while presenting. It threw me off for a bit, since it formats fine in the editor. I saw that the formatting is based on "Ace code editor", but i do not know if this should be fixed there, or not.

I would like to help but have no experiance with Go-lang or much with js either. If someone has time to walk me through the project i'm down for learing. :grin:

[only1thor]

Here is an example:

---

```yaml
--- 
  - name: ansible example:
    hosts: all
    tasks:
      - name: ping a thing
        ping: 
          data: "oh, this worked!"

For some reason images added will not render as images. 
paste that into the demo, and check it in "present" mode.