Move special task to shopify camus job

@drdee working on merging camus upstream.
I'm currently trying to move all custom functionality related to shopify inside shopify jar, this cleans up camusjob to its original glory and extends it in Shopify job, thoughts ?

The base pr which has latest master of camus + our latest changes is here https://github.com/linkedin/camus/pull/121

I'll  be merging all my changes back into my branch after which I'll cleanly separate them out