Automatic removal of stocked email for on-the-fly computation

[MarcAndreDubuc]

Delete email after 30 days in the inbox, logs and celery logs

[davidcaron]

I released a new version today at finch.crim.ca that should cover all this.

• There is no inbox anymore, the emails are sent from CRIM's mail server directly and the sent emails are not kept
• The logs don't contain the email anymore, just the information that the email was sent successfully or not
• The celery logs are flushed when the job is processed, and that is by design of celery. The only possible case where this would be an issue is if the job would take more than 30 days to even start processing, but we would have a much bigger problem then.

As far as I know, this should cover all cases.