nov/fb_graph — pull request #346 by kissrobber (2014-01-16 11:03:15+00:00)
Title: adding a method for getting an application id from a user access token

for http://stackoverflow.com/a/8730549/910259

```ruby
app = FbGraph::Application.app(user_access_token).fetch
raise unless app.identifier == MY_APP_ID
```