Initial frontend changes

I hate IE6 so this blog no longer supports it :D . And I removed broken
<ul> list.
Sprite for social icons

I used http://pl.spritegen.website-performance.org/ to generate sprite
image (from zipped /img/social-icons/circular folder) and CSS code. I
pasted sprite css to /css/social-icons.css file and I used bulk replace
in my editor to match sprite rules to html selectors.