All Sites: Never wraps in the middle of words in a <code> block.

`<code>` blocks still wrap, but now words are never broken up. Thanks @gnarf.

![screen shot 2014-01-14 at 11 33 28 am](https://f.cloud.github.com/assets/544280/1912431/0fa9000a-7d3a-11e3-8421-0bb7b275e928.png)