This commit introduces timer-less retry system:
1. Any change to URL is going to stop listening to any messages.
2. If a message is sent and there's no handler that could pick it up,
the message gets enqueued.
3. The message is sent again to the first handler that attaches itself
to given event type.
While in theory this is full of holes (no control over the first
handler), in practice, it works quite well.
Additionally, views.listenToMessages was attaching to completely wrong
DOM node; this commit fixes this as well.
This is to let user log in if their login cookie is broken (for example
when it refers to a non existing user). Normally, the client should
treat errors caused by cookie logins as temporary server failures,
inform the user about it and leave the cookie, so that when the server
is up again, all user needs to do is to reload the page rather than
logging again.
