Returns 201 even if nothing created

This is really an issue with me getting pdf-bot to work at all. Right now I can send POSTs and they get added to the job queue as completed, but no PDF is generated. The response JSON seems to confirm that nothing is being done:
```
{
"meta": {
"type": "invoice",
"id": 1
},
"url": "https://localhost:3001/test",
"id": "ae6f6151-cb6a-4d21-914b-a10a8154ff94",
"created_at": "Wed, 27 Sep 2017 16:55:30 GMT",
"completed_at": null,
"generations": [],
"pings": [],
"storage": {}
}
```

My `/test` endpoint is never touched as well as the `/hook`. I have google-chrome running via pm2 and am running pdf-bot with a basic local storage config file. I can't get any errors to display anywhere.

1. At the very least, I think that `201 Created` should not be the response if nothing is actually created.
2. Is there anything obvious I'm missing in getting pdf-bot working? Thanks.

Config if it helps:
```
var htmlPdf = require('html-pdf-chrome');
module.exports = {
api: {
port: 3000,
token: 'api-token'
},
generator: {
completionTrigger: new htmlPdf.CompletionTrigger.Timer(1000) // 1 sec timeout
},
storagePath: "/Users/matthewmolnar/junk/pdf-storage",
webhook: {
secret: '12345',
url: 'http://localhost:3001/hook'
}
}
```