Improvements to the videoExamples site

I made some improvements to the videoExamples site:

* Added some semantic tags and meta content
* Move JS/CSS to external files
* Placed the JS at the bottom
* Added some styling for the pause/play buttons
* Added a JS fallback
* Moved button event logic off the elements and into central JS

![Here's what it looks like now](http://i.imgur.com/pml6fj4.png)