Adding models for the RAML, JSON-API, and JSON Schema specs.
Merge pull request #40 from GoIntegro/feature/issue-33-spec-models

[ISSUE-33] Adding models for the RAML, JSON-API, and JSON Schema specs.
Added a lot of docs.
Merge branch 'develop' of https://github.com/GoIntegro/hateoas-bundle into develop
Small bug.
Updating the docs.