set up an email support system

We need to provide email support for matters that users would like to keep private. @pjc has [reached out](https://twitter.com/celispj/status/361827541251661826) re: https://supportbee.com/. I've signed up for a trial account and it looks like it could be a fine product. We don't have quite the email support volume yet to justify it but hopefully we will soon! :-)