Fix ACE code editor rendering.

action -> reason

Load ACE from a CDN -> was wasting too much time figuring out loading js
files locally in sinatra.

Change editor.erb to editor.haml -> now it will use the layout.haml
automatically.

Set haml ugly option to true -> Fixes haml adding extra spaces into code
examples.

create a public/javascripts folder -> default that Sinatra expects for
future javascript files.