Cookies required message.

When attempting the first signup flow, if your browser does not have cookies whitelisted on the stringer domain, the app will throw an exception.

This probably isn't the best solution, but it gives a more friendly message than a 500 error.

![screen shot 2013-05-11 at 11 09 30 pm](https://f.cloud.github.com/assets/1817/492600/93709a52-baca-11e2-82a5-2e9795b4f4c4.png)