Erins writing some tests

Rori, I need you to take a look at the requests controller spec tests. The change in association between the requests and the organizations is making the new, edit and show view tests fail and I'm not sure what I need to change. It looks like the routes are not nested, but are dependant on each other? 

I still need to write all the feature tests, the controller tests for the contributions and sessions controllers, and model/unit tests for the contributions model, but this is a good start! 49 passing tests! 

Please check it out, make whatever changes to requests_controller_spec that need to be made, and merge it.