Local events feed (Happenings)

Resubmitting after review
This is sort of what the original remember_token method should have done:

```
class User

  # I'm overriding the public getter, which is allowable
  def remember_token
    self.remember_token ||= SecureRandom.urlsafe_base64
  end
end
```

There's some stuff to debug in there, but you get the idea.