Rename `Users` to `Network_Users`, which affords us a bit more flexibility
Shove all of the functional logic inside of a `Users` class so we can share logic
A basic "site" state
Allow roles to be managed in the User region
Users have no roles in the network context, so don't let them be managed.
Add a Terms region. Currently supports exporting a Site's terms
Support for imposing terms on a site
First pass at a schema for terms
Merge pull request #9 from danielbachhuber/site-state

Add a Site state