Api for content, content_type, users and categroies.

Setup auth token. Limit access to POST, PATCH, DELETE

Utilizing Accept header for API versioning /App/Http/Middleware/ApiAcceptHeaderV1. TODO add some sort of parsing on header to check version and response format. I am still figuring this out and it is not truly required until actual versioning of the API.

Setup config on models for allowed request parameters.