hydra-module.nix: Make it possible to add extra config lines

Signed-off-by: Shea Levy <shea@shealevy.com>

Created by  Shea Levy  on September 22, 2013
4J33F22TRXXW3WRI3KAF7DQZXQ7JH3A5XBNR7BJCKK7OFUF4AHSQC
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