Parade compatibility

I converted a few presentations over to the new Parade format. The biggest difference between Parade and Showoff is the following:

* `parade` instead of `showoff.json`

> This is ruby DSL so you are able to be more succinct.

* Code is designated with code fences and not the `@@@language` that was used previously

> This is because I wanted to use standard GitHub Flavored Markdown in my presentations.

* Slides are not centered by default

> You can add a 'center' class which will center everything on the slide (both vertically and horizontally) or you can use 'title' which is probably what you use to using.