Issue80 crud production function

Fixes #80 

Adds function to perform CRUD operations on production entries.

See related:
https://github.com/DoSomething/dosomething/pull/3240
This is a bit of an odd way to do this (submitting a form programatically to save records).... I'd suggest creating a function `message_producer_production_options_save` that you call within the `message_broker_producer_production_options_form_submit` function.. which you could then actually just use as your CRUD function too... does that make sense?  Happy to discuss more