get_connections("me", "picture") doesn't work

[arsduo]

Facebook's "picture" connection should get the user's picture. Unfortunately, they do that by redirecting the request to the picture, not returning the URL as JSON. This totally blindsides Koala, and so it returns nil rather than chasing the redirect. We need to special-case either "pictures" or that kind of redirect to return the redirected URL.

[arsduo]

Resolved. We now have a "picture" convenience method that gets the picture using the new backend infrastructure that allows us to return results stored outside the body of the response (in this case, it's in the Location header field).