Test for websites served as application/xhtml+xml

Replaced &nbsp; to &#160; & &larr; to &#8592;

It was just to make Breaq working on my website served as application/xhtml+xml http://www.nicolas-hoffmann.net/  

Don't know if it will be the most important fix, however Breaq works now on it :)

![sans-titre-1](https://f.cloud.github.com/assets/2578321/1548864/dea954d8-4dd6-11e3-90d0-3fb23bc6cc1c.jpg)

\o/

![nhpq2x7](https://f.cloud.github.com/assets/2578321/1548874/1dfe7abe-4dd7-11e3-9966-c8e0118a78fd.gif)