Allow changing of the doctrine dbs key

[mathewpeterson]

Currently, the 'bernard' dbs key is hard coded, this should be configurable.

[henrikbjorn]

Any specific reason why?

[mathewpeterson]

Yes, it seems unnecessary to create a separate connection for the doctrine driver. I would have thought it would try and use the default connection.

[henrikbjorn]

You are free to do a PR and ill look into it :)