Updated Gemfile to reference jekyll 2.0
Updated jekyll config file
Unified YAML frontmatter style across all posts and cleaned it up

Removed all that keyword spam from my early days of SEO.

In addition frontmatter values should no longer be enclosed in quotes and the
order should be as follows:
---
title: ...
layout: ...
category: ...
otherstuff: ...
---
Merge branch 'jekyll-2.0-update'