Implement antispambot registration controls

This pull request adds a simple field on the registration page that says "Fill in the blank: SYN/HAK, The ____________ Hackerspace. Hint it is our city." and if the registrant does not correctly fill in the blank, they are refused registration.  Outside of this, there shouldn't be any additional code that needs to be deployed.  It should be a simple case of pull and deploy.  The extension required to have the registration field was already there, as it was provided with our ConfirmEdit extension.