- Move `ProctedBranchAccessEe` to `EE::ProtectedBranchAccess`. This is a lot
  cleaner, and has a precedent (`EE::Group`).

- Include `EE::ProtectedBranchAccess` inside `ProtectedBranchAccess`, instead of
  including both in the model classes. `EE::ProtectedBranchAccess` depends on
  `ProtectedBranchAccess` - this is a good way to model that dependency.

- Remove author credit from CHANGELOG entry