Formatting.
Modified dependency version.

Changed Gemfile such that it will run without trouble with my
distribution-supplied Ruby 1.9.3 (the system is Ubuntu 13.04).
Cleaned up article template.

Removed a bunch of stuff that I don't think is useful. Added the list of
tags that the article is tagged with.
Added CSS for article tag list.

Formatted it as a comma-separated list of tags.
Updated article template.

Added date and cleaned up things overall.
Added another example article.

This helps a bit with fleshing out the blog pages.
Cleaned up blog page.