adds passenger to deploy config

Capfile

@@ -8,6 +8,7 @@ require 'capistrano/rvm'
 require 'capistrano/bundler'
 require 'capistrano/rails/assets'
 require 'capistrano/rails/migrations'
+require 'capistrano/passenger'
 
 # Load custom tasks from `lib/capistrano/tasks` if you have any defined
 Dir.glob('lib/capistrano/tasks/*.rake').each { |r| import r }