Expose Relay.QueryConfig as a public method

[washt]

@steveluscher should we go ahead and depreciate RelayRoute here too?

[wincent]

Thanks for the PR @washt. Just trying to understand the intent here. Do you have some context that you can link to here for why you want to do this? RelayQueryConfig itself doesn't really do anything at all, so I am not sure of the value of exposing it. The rest of Relay really only cares about the interface, RelayQueryConfigInterface.

[wincent]

...aaaand I found it (here).

[josephsavona]

@facebook-github-bot shipit

[ghost]

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