sandstorm-io/sandstorm — pull request #128 by dwrensha (2014-10-01 01:16:32+00:00)
Title: reject with an actual Error

Rejecting with a string causes an error in `shouldRestartGrain()`, which assumes that `error` is an object:

```
HTTP request failed after response already sent: TypeError: Cannot use 'in' operator to search for 'nature' in done() was never called on outbound stream.
```