Organizations CRUD

Adds organizations crud operations according to the user story from PT:
https://www.pivotaltracker.com/story/show/77974308

Accessible on Heroku instance: 
http://sleepy-reef-7794.herokuapp.com/admin/organizations

Implements organizations crud with cucumber tests (similar to the ones for partners) and rspec tests for the model. 
So far we haven't created the relationship from the status side. Partner and Sponsor also have the same relationship with Status but we don't specify them in the Status model.

The idea was to leave these out of the Status model for now, until a time comes when we need to fetch db objects based on their Status.

I don't mind adding this, but if we are going to do it, then we have to do for other models as well. What do you guys think?