Personalised blog

With the following changes:

 * renamed Grey Area
 * added artwork based on Iain Bank's iconic Excession cover art
 * modified header text colour to grey
 * link in navigation back to http://gladwell.me
 * updated copyright notice.
 * personalised RSS feed.
Added Twitter widget sidebar

Added official Twitter widget sidebar to index page.

Styled Twitter widget to be transparent and disabled scrolling and footer to
match Bootstrap theme.
Added third-party comments

Enabled Disqus third-party comments to all blog posts.
Added analytics

Added Google Analytics JavaScript to site footer.
Added Anatomy of a Rebase Post

Added blog post on the subject of git rebasing and which commits to
squash.
Added highlights to git log examples
Added custom domain.

Added custom domain for Github Pages.
Narrowed post pages for better readability
Added semantic article tags to blog posts.
Increased size of posts text to be more readable.
Added automatic feed discovery.

Added a link to the RSS feed in the header for automatic feed
discovery.