Changed unauth to call original Firebase unauth. N.b.: Spec is untested

I still can't get the specs to run. I get:

```
Warning: already initialized constant FirechatNS
2014-06-14 16:49:08.105 motion-firebase[6302:70b] undefined method `describe' for main:TopLevel (NoMethodError)
```

The first line is a result of who knows what, but the second is a setup issue. A Rakefile and Gemfile that allow specs to run would be helpful.