Parse the accept header for authentication to get the version and format of the request.

Signed-off-by: Jason Lewis <jason.lewis1991@gmail.com>
Allow scopes to be given to transformers for nested or embedded relationships.

Signed-off-by: Jason Lewis <jason.lewis1991@gmail.com>
Renamed from scopes to embeds.

Signed-off-by: Jason Lewis <jason.lewis1991@gmail.com>