feature(script): improve cancel() #602
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Allows passing an error object to `cancel(err)`, or an exception object returned by the deployd internal-client (eg. {message: "", status: 400}).
This allows easy chaining such as (in an event script):
```javascript
// call some other collection via internal-client
// both cases are handled by the new cancel, whether the code throws an Error object, or if .get returns an exception of the form {message, status}
dpd.somecol.get({...}).then(function() { error may get thrown here }.catch(cancel);
```
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Allows passing an error object to
cancel(err), or an exception object returned by the deployd internal-client (eg. {message: "", status: 400}).This allows easy chaining such as (in an event script):