Word break element is self-closing

* The <wbr /> tag for word breaks in HTML5 is [auto-closing.](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/wbr)

![screen shot 2013-11-29 at 9 49 42 pm](https://f.cloud.github.com/assets/2602872/1648271/7c626f4a-5983-11e3-8958-d0cfd3733074.png)