Make Rake Task load_cip_data configurable

Hi everybody, we over at Open Oakland are trying run our instance of ohani api. It seems like some of the SMC data is hard wired in and I would love if we could work together to decouple it a bit. My first step has been to make it a bit more clear what data is SMC specific and letting the rake task accept files. I think we can DRY up the farmers market stuff too. I would love to hear your guys advice on what else you think you should and can be done.