Change cStringIO to StringIO for Unicode handling

Fixes #4, but also removes xml encoding declaration due to lxml errors.
Err, sanitize.  https://www.google.com/search?q=sanatize&oq=sa&aqs=chrome.0.69i59j69i57j69i60j0l3.5125j0j9&sourceid=chrome&es_sm=91&ie=UTF-8