Start using RevealCK

When this project was first created, reveal-ck didn't exist.

The ```slides.html``` that was in this project was the genesis for reveal-ck: why not be able to author that, and only that, in HAML and then have some tool "do the rest."

Now that reveal-ck does exist, as a proof of concept, I went back and modified the files in this project to use reveal-ck.

Reveal-ck hasn't been published to rubygems.org yet.. so the associated Gemfile is misleading. Regardless, I wanted to make sure I *could* transform this talk into the reveal-ck format before I published reveal-ck.

While I was here, I updated the documentation so that it:

* discussed reveal-ck
* was split out into distinct files