Make it more obvious that webchat users are guests
Make it more obvious that webchat users are guests

Currently, people join the irc all the time asking php questions under the name `fig123` leading people to believe that it's a single person asking hit and run questions :P

This changes the guest names to `fig_guest123`.
php-fig/php-fig.github.com,stefanotorresi/php-fig.github.com,php-fig/php-fig.github.com,php-fig/php-fig.github.com,php-fig/php-fig.github.com,stefanotorresi/php-fig.github.com,php-fig/php-fig.github.com,stefanotorresi/php-fig.github.com,stefanotorresi/php-fig.github.com,stefanotorresi/php-fig.github.com