The "standard entity" representation.  It's now nested inside of a sub-entity wrapper.  By doing this we don't have to modify the actual entity if its nested.  Attributes like "href", "rel", and "name" would go in the sub-entity wrapper since they would never be found on the standard entity.

* I'm using the term "standard entity" in the way it is used in [the docs](https://github.com/kevinswiber/siren#embedded-representation) to signify an entity that is not a "sub-entity"