Breaking news

![screenshot](https://cloud.githubusercontent.com/assets/1147913/3800991/0f73b1fc-1bff-11e4-8840-dfee286b4cb0.png)

Consumes `/breaking-news/lite.json` and decides which item to display from it - if any - based on page section, primary keyword, and the user's histogram of visits to these.
"never" means we have no hard plans to evaluate whether this is any use or not...

Rather put an initial expiry date in so we are forced to go back to it.