Send automatic email reminders

Closes #4

config/environments/defaults.rb

@@ -6,3 +6,5 @@ set :values, [ { :id => 1, :label => _("Awful"), :color => '#ff4500' },
                { :id => 5, :label => _("Good"), :color => '#228b22' },
                { :id => 6, :label => _("Very good"), :color => '#006400' } ]
 set :expire_after, 7 * 24 * 60 * 60 # 7 days
+set :reminders, [ { :timeout => 48 * 60 * 60 },
+                  { :timeout => 24 * 60 * 60 } ]

config/schedule.rb

@@ -6,4 +6,5 @@ set :environment_variable, 'RACK_ENV'
 
 every 5.minutes do
   rake "close_expired_votes"
+  rake "send_email_reminders"
 end