HTML support for quotequail

Using BeautifulSoup. Needs some more cleanup. Not sure if BeautifulSoup is the best way to go though. It's pretty old and some people say it's slow (haven't benchmarked yet). The advantage is that it parses poor HTML well. See e.g. http://stackoverflow.com/questions/4967103/beautifulsoup-and-lxml-html-what-to-prefer