Altered bootstrap template for my needs

- Added piwik template for Piwik web analytics.
- Increased body font size in bootstarp.min.css
- Changed colors pygments.css to match perldoc
- Added neighboring links using neighbors plugin in article.html
- Added LaTeX support using LaTeX plugin and piwik in base.html
- Also changed sidebar links in base.html
- Added sorting to sort tags by alphabetical order in tags.html