First cut of StackOverflow widget

Lots left to do... e.g. i18n + singular/plurals when needed
First cut of blog summary widget

This one has all kinds of CORS issues :(  It will only work from
www.worthlesscheese.com, so I'm either going to have to hack the
Wordpress JSON plugin or force all visitors onto www instead of
accepting raw worthlesscheese.com.  It also makes local testing painful.