Google plus and syntax hightlighting

Thanks for this excellent theme! Here are the modifications I made to it on my blog:

Adds google plus badge next to the Twitter and Facebook ones.

Tumblr posts, as far as I can tell, frequently use ``<code>`` tags within ``<pre>`` tags to denote code snippets. For ``<code>`` tags without the class ``uglyprint`` will use Google's prettify code.