Added IRC handler in /etc/sensu/handlers/ from https://raw.github.com/sensu/sensu-community-plugins/master/handlers/notification/irc.rb
forgot to add the new irc.rb file in files/default/handlers
Added mailer.rb to the handlers files from https://raw.github.com/sensu/sensu-community-plugins/master/handlers/notification/mailer.rb
Created a mailer recipe to create and configure the mailer handler
Merge pull request #30 from x974/sensu

Sensu - Added IRC and Mailer Handlers. Reviewed, looks good, let's see if it works! ;-)