Adds delayed jobs recipe for production, and some documentation added for running delayed jobs in local

INSTALL.md

@@ -60,6 +60,12 @@ myprovider_secret = 'sample data'
 That is required so that the check in app/views/devise/shared/_openid.html.haml will pass and
 the image-link to login using the provider will be shown.
 
+
+11. Open a separate terminal and go into the directory where the rails app is present, and type the following to start the delayed_jobs worker for sending email notifications.
+```
+rake jobs:work
+```
+
 ### Run OSEM in production
 We recommend to run OSEM in production with [mod_passenger](https://www.phusionpassenger.com/download/#open_source)
 and the [apache web-server](https://www.apache.org/). There are tons of guides on how to deploy rails apps on various

config/deploy.rb

@@ -28,6 +28,10 @@ end
 
 desc 'Deploys the current version to the server.'
 task deploy: :environment do
+  to :prepare do
+    queue "cd #{deploy_to}/current && RAILS_ENV=production script/delayed_job stop"
+  end
+
   deploy do
     invoke :'git:clone'
     invoke :'deploy:link_shared_paths'
@@ -38,8 +42,9 @@ task deploy: :environment do
 
     to :launch do
       queue "sudo /etc/init.d/apache2 restart"
+      queue "cd #{deploy_to}/current && RAILS_ENV=production script/delayed_job start"
     end
-    
+
     invoke :'deploy:cleanup'
   end
 end