Support auto-highlighting for preformatted code

Contribute Feature
12

As a quick hack I added missing languages with this small addition to app.yml:

hooks:
  after_code:
    - exec:
        cd: $home
        cmd:
          - curl http://cdnjs.cloudflare.com/ajax/libs/highlight.js/8.2/languages/haskell.min.js >> $home/public/javascripts/highlight.pack.js
          - curl http://cdnjs.cloudflare.com/ajax/libs/highlight.js/8.2/languages/lua.min.js >> $home/public/javascripts/highlight.pack.js
          - curl http://cdnjs.cloudflare.com/ajax/libs/highlight.js/8.2/languages/tex.min.js >> $home/public/javascripts/highlight.pack.js
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