Follow button. Also disabled states.
Subscribe a bit less in the login preferences panel.
Make `credential` on the API client public.
Observe the API client's `credential` value to keep state in one place.
Make those following methods public.
Remove a chatButton reference.
Add setNeedsDisplay to reloadData (in case we authenticate while the list is displayed).
Add bindings for the new follow button.
Add a function to process the API's isUserFollowing method's return values.
Modify UserImageView a bit.