For real this time, fix the CSS

Docs:
* http://jekyllrb.com/docs/github-pages/#project_page_url_structure
ugh, conflicts

Merge branch 'really-fix-css' of https://github.com/zspencer/AGuideToClassMobility into zspencer-really-fix-css

Conflicts:
	_layouts/default.html
Merge branch 'gh-pages' of https://github.com/LynnCo/AGuideToClassMobility into gh-pages
Use excerpt instead of description

Excerpt is built into jekyll.

* http://jekyllrb.com/docs/variables/#page_variables