Authentication Issue

I tried to connect to  a secure MongoDb instance using:

```
        MongoDBConnection.username = "XXXX"
        MongoDBConnection.password = "YYYY"
        MongoDBConnection.authdb = "ZZZZ"
```

But theses parameters are never used. Instead, in order to connect the following works:

`MongoDBConnection.host = "XXXX:YYYY@localhost/ZZZZ"`

