Activated social login, temporarily deactivated normal signup

I have just activated Facebook, Google and Github signup. It currently automatically gives you a username that is just your first name and last name concatenated (or your Github username), but it probably makes sense to allow you to change your username manually in the long-run. Let me know if you run into any problems.

We’ve also had some spam accounts being a bit annoying, so I’ve deactivated normal account signup. I will activate it again after I’ve built some smarter spam account detection systems. If you need an account not associated to a social login in the meantime, just ping me on Intercom and I will set you up with something.

Oh, and also comments at −5 karma or below are now by default collapsed.