Why don't these follow our variable naming of `groupId` and `padId`?

Also, I think I would prefer the properties as:

```javascript
contentObj.html = hash.html
contentObj.etherpadGroupId = hash.etherpadGroupId
contentObj.etherpadPadId = hash.etherpadPadId
```

Translation from the structured objects to flattened properties I think can become problematic and confusing. We are already feeling it a bit in the Principals model with the "extra" object.