Keep losing authorisation

[rebroad]

I have to keep re-authorising the app with Facebook - I'm unsure how long the authorisation lasts, but it seems to last perhaps a day at the most. I can provide more accurate timings if need be.

[mayeaux]

There's some code in the app somewhere to refresh the auth token automatically but I commented it out because it seemed to be buggy. You might want to check that code, I'm pretty sure we can tell when a token is expired because the calls will start logging to the console as being unauthorized.