Gratipay is gone :(

For #1359

This failure from https://circleci.com/gh/badges/shields/1411?utm_campaign=vcs-integration-link&utm_medium=referral&utm_source=github-build-link

```
  7) Gratipay
       Receiving

	[ GET http://localhost:1111/gratipay/Gratipay.json ]:
     ValidationError: child "value" fails because ["value" with value "invalid" fails to match the required pattern: /^\$[0-9]+(\.[0-9]{2})?\/week/]
      at Object.exports.process (node_modules/joi/lib/errors.js:190:19)
      at internals.Object._validateWithOptions (node_modules/joi/lib/types/any/index.js:669:31)
      at module.exports.internals.Any.root.validate (node_modules/joi/lib/index.js:139:23)
      at Object.pathMatch.matchJSONTypes (node_modules/icedfrisby/lib/pathMatch.js:303:9)
      at node_modules/icedfrisby/lib/icedfrisby.js:703:10
      at IcedFrisbyNock._invokeExpects (node_modules/icedfrisby/lib/icedfrisby.js:1294:33)
      at start (node_modules/icedfrisby/lib/icedfrisby.js:1274:12)
      at Request.runCallback [as _callback] (node_modules/icedfrisby/lib/icedfrisby.js:1232:16)
      at Request.self.callback (node_modules/request/request.js:186:22)
      at Request.<anonymous> (node_modules/request/request.js:1163:10)
      at IncomingMessage.<anonymous> (node_modules/request/request.js:1085:12)
      at endReadableNT (_stream_readable.js:1056:12)
      at _combinedTickCallback (internal/process/next_tick.js:138:11)
      at process._tickDomainCallback (internal/process/next_tick.js:218:9)
```