All fields are merged in case of related entity with the same iri #47

In case of subresources using the same "iri" of the parent, all fields are merged into the same resource.

Test case, two entities with the same iri:

// entities
User:
    id
    username
    password
    userProfile (OneToOne)

UserProfile:
    id
    photo
    firstname
    ...

// resources file
App\Entity\User:
    iri: 'http://schema.org/Person'

App\Entity\UserProfile:
    iri: 'http://schema.org/Person'

Result is all the fields of the latest entity (with the same iri) parsed by the parseHydraDocumentation(), in my case the fields are from "UserProfile" entity.