Larger icons for icons in gh-pages !

I regularly having difficulties finding icons I'm looking for on the website, because icons are too tiny.

So, there is my proposal: display bigger icons. They're the most important thing to show about this project !

So be proud, show them, and make it easier to find an icon.

Before:
![before](https://f.cloud.github.com/assets/527245/975102/82aa0ae2-066e-11e3-84b4-9dd8be69e516.png)

After:
![after](https://f.cloud.github.com/assets/527245/975103/857a443a-066e-11e3-8b25-aa54556b86a3.png)