Fix Issue #25. Links to catogories now default to lowercase tags in the <a> tag.
Page body now correctly centered. It was slightly off-centered to the right previously.
Update readme.md to properly reflect how the 'light' theme should be installed.
Add css selector to quickly find post metadata in the DOM.
Merge branch 'master' of https://github.com/alexgaribay/octoflat into upgrade

Conflicts:
	source/_includes/article.html
	source/_includes/post/categories.html