create and validate Captcha for Catalyst

 Catalyst::Plugin::Captcha creates and validates Captcha objects.
 .
 Note: This plugin uses GD::SecurityImage and requires a session plugins like
 Catalyst::Plugin::Session
 .
 Captcha is a type of challenge-response test used in computing to determine
 whether or not the user is human.
 .
 Catalyst is an elegant Model-View-Controller web application framework
 written in Perl.