[test data] Add reveal-js's index.html to spec/data/html
[test data] Add reveal-js's index.html to spec/data/html

* wget https://raw.github.com/hakimel/reveal.js/master/index.html
* https://github.com/hakimel/reveal.js/commits/master/index.html was
  at 082e4ed1686747d9472c4448dc4387084f6238e2

jedcn/reveal-ck,jedcn/reveal-ck,jedcn/reveal-ck