Fix misc styling bugs.

- Change header and site name colors
- Fix heading sizes for pages and archives
- Change navigation link color
- Fix syntax highlighting. Now using solarized theme
- Fix HTML lists using list-style-position
- Increased spacing between posts
- Update foundation CSS, JS files
Update screenshot.
Update pygments.css to use dark solarized color scheme.
Fix scrolling with syntax highlighting.
Fix syntax highlighting.
Undo white-space nowrap for pre tags.
Fix pre tag white-space behaviour.
Merge pull request #99 from Mins/master

Updates to tuxlite_zf theme.