Create / set up jobs to pull in votes and delete them after a few months

[jbmertens]

There's some stuff here. https://github.com/cwru-pat/coffee_stuff/blob/master/cron.php

To do:

• [x] Get papers from arxiv
• [x] Post them on the appropriate date
• [x] Remove old ones (~ 3 mos? Don't include ones not being voted on?)