Add swagger groups

[cmharlow]

Adding more swagger information based on our preliminary modeling.

Does not include:

• webacl parameter-based URI actions for Trellis, which I think may be a problem for Swagger;
• profiles as separate resources stored within a group, which is next to work on;

Does include:

• dummy person-based authentication expectations, which we'll probably remove;
• Users as a separate domain proposal (which we may or may not keep).

[cmharlow]

Tagging a few different folks for a reality check on expectations.