Feature/setup wizard

t/register-and-settings.t is failing, but I'm creating the pull request anyway, so you can review my evil plan @marcusramberg.

So the idea is that your're in "wizard" mode when registering for the first time, instead of going directly to the dreadful settings page.

And
  - Add welcome message unless server log contains any messages
  - Will only change user:$login:conversations from irc events
  - Change redirect_last() to redirect to (random) server log unless
    any conversations
  - Change redirect_last() to redirect to wizard unless any connections
    are defined

Yes, we also need to fix the settings page, but I want to do this in steps.

Please try it out and give me feedback.

To test:
- Don't start the backend
- Only start the frontend
- Make sure you're logged out (http://localhost:3000/logout)
- Flush the database
- Try to register

The main things that are changed: The login and register forms + i've added the wizard page after the register.