Allow the story container to scroll horizontally

Blog posts featuring long lines of pre formatted text don't wrap (obviously) so the end of any content is lost off the edge of the screen. Examples include many posts from The Daily WTF (http://thedailywtf.com/) such as:
* http://thedailywtf.com/Articles/State-of-the-UNION.aspx
* http://thedailywtf.com/Articles/The-Professionals.aspx

Allowing automatic horizontal scrolling solves this.