Fix mailer

There was an issue where you would not be able to send emails out the first time you tried to start or close a session on Janeway. This should be fixed by a polling system that polls every 5 seconds for emails. So upon opening Janeway and going to the Planning Poker tab and if you wait 5 seconds it should send an email out to whoever is on the email list in your database when you click close session. The same goes for when you start a session, if it's been 5 seconds since the opening of the Planning Poker tab and 5 seconds since the last update to Mailer it should mail properly.