temporarily add a 'real' secret key

...to see if heroku will deploy...
heroku says rails12factor is useful
Try using env-setup secret key again
put back the secret key

can't do it...
works in dev, but not in prod.

seems that heroku just can't handle the secret key for devise coming from an environment variable.

Bummer.

Well - this isn't likely a high target at this stage, i can kill it from
github at a later date if i must. But for now - the only way to get it up on
heroku is to put an actual secret keybase in here.
Add a url host to make devise happy with sending emails
whatever - new secret key
Attempt to configure for sendgrid

heroku tells me we need these values in action mailer to get sendgrid
working.
this failure is stopping me from signing up to my app.