[update-reveal.js] Switched from "master" to "dev" branch of reveal.js

Needed to remove the "min" from css and js, as they aren't minified on
the "dev" branch like they are on master.
Merge branch 'update-reveal.js' into upcoming

* update-reveal.js:
  [update-reveal.js] Switched from "master" to "dev" branch of reveal.js
[support-tables] Upgraded redcarpet
[support-tables] Wrote up feature based on GFM Help

I read through the help on this page:

https://help.github.com/articles/github-flavored-markdown/

And wrote up Aruba/Cucumber to verify that I supported the core use
cases.

I threw in "mark" ala ==highlight== because I saw this in redcarpet and
figured it couldn't hurt?
[support-tables] Enabled various Redcarpet functionality

Tables, strikethrough, highlight..