CRUD Operations For Organizations

[dchukhin]

12

This pull request makes the following changes in the org app:

• adds an Organization model with the following fields: name, slug, and users
• shows all of the request.user's associated organizations on the org dashboard page
• adds views for creating, editing, and deleting an Organization that the request.user is associated with
• creating an Organization automatically associates the request.user with it
• since users likely won't be creating slugs, creating an Organization gives it a unique slug based on its name

Also, I added the factory-boy and faker libraries, and tests for the above functionality.