ConfigBuilder::build can now consume config

[SarthakSingh31]

#171

[estk]

I'm sorry its taken so long for me to get to this.
I think the api could use some refinement, in theory i agree this should exist though.
For instance I wish that the config builder included the root so that you could just call .build on it but I'm not sure the consequences this would have. I have hesitated to respond before doing all the investigation but I just have not had time. Perhaps you can do some investigation and we can chat about other solutions. Sorry for the incomplete answer :/

[estk]

closing stale