Query does not accept field names without quotes

Query object written in 'Find' field must be a valid JSON. 
For example

```
{ uuid: "data" }
```

results in 500 Server Internal Error. 

```
{"uuid": "data"}
```

is OK.
Mongo shell accepts first variant also. 
It would be nice to accept field names without quotes because it's less typing and some people (including me) have got used to type names without quotes. 
