Rule to find past members does is >30days, not >=30days

[gscardine]

• [x] Tested tamarin on heroku; user was unsubscribed after 30 days, but received no emails. Later either the administrators or the person herself could receive an email notice when unsubscribed.
• [x] "export past members" now includes those who expired 30 days ago (before only >30), to match rule that ubsubscribes them on mailchimp