Updated site to use Jekyll

[Jekyll](http://jekyllrb.com/) makes it really easy to make multi-paged sites with a consistent look everywhere, without having to manually copy/paste and edit every page when you make a change that effects them all. Just edit the appropriate include file and away it goes! (Wow, that sounded like an advertisement. :stuck_out_tongue:)

In all seriousness, I use Jekyll to power [my site](http://le717.github.io), and I can truly say it not be as good as it is right now (even though it still needs work) had I not used Jekyll. :smiley:

I also made some minor changes to your CSS, About page layout, and markup.

* `</br>` is not a valid closing tag (use `<br />` or use `<br>`)
* `<b></b>` is depreciated in HTML5 (as is the `<center></center>` tag, but I left that in)
* Added new CSS classes for bold, italic, and underline text
* Minor formatting improvements on the about page to make it look better (did not touch the text).

If you have any questions, always check the [Jekyll documentation](http://jekyllrb.com/docs/home/) first, but you can ask me too. :)