Added simple Football Troubleshooter

With football season upon us we are more likely to be getting football related issues.

A simple screen with some advice and examples for troubleshooting feed problems. The attached screenshot shows the api key as XXXX, but in the actual thing has the correct key.

There is also a link from the front page.

![football-problems](https://f.cloud.github.com/assets/76709/907117/253eb0f2-fd0d-11e2-8dca-aaf16382fd21.png)