[done] Spam

[David]

I've reset the database and although only two teams have been created, there are 19 users - looks like spammers/bots are here already.

I will amend the registration script to prevent them signing up as a priority.

We still need 8 teams in total before the season can start, I have six people who have said they'd test so we just need two more.

Thanks for your patience!

[David]

I've implemented a simple captcha, a random maths question, let me know if you have any problems with it!

Not sure if this will resolve the spam but will keep an eye on it.