Fix link to Balanced Payments

Fix the link to Balanced Payments, on the privacy page.
Merge pull request #678 from exclsr/patch-1

Fix link to Balanced Payments
Improve error handling on twitter sign-in; #681

Did some user testing with a friend, right off the bat when he signed in
he got a 500. :-/  Looks like it was a bad response from twitter, but we
weren't logging the response code. This changes that.
Bump version to 7.0.35
Bump version to 7.0.35-dev
Bump version to 7.0.36
Bump version to 7.0.36-dev
Bump version to 7.0.37
Bump version to 7.0.37-dev
Bump version to 7.0.38
Bump version to 7.0.38-dev
Push to 'master' branch on heroku
Bump version to 7.0.39
Bump version to 7.0.39-dev
Merge branch 'master' into delete-button
Change first step from a button to a link; #664

Deleting an account is of course a big deal and shouldn't be too easy to
do. Leading with a button makes it feel too available as an option.
Linking to a page with more info is better.