Bring dependencies up to date and fix tests accordingly. Closes #93.

* `twitter_cldr` call changed
* Rouge's behavior changed to wrapping all code in `<pre><code>` blocks instead of just `<pre>` blocks.

I don't think the Rouge change is significant, so I changed the tests to match. @sunny @jamieoliver do you see any reason not to accept the `<pre><code>` blocks?