Add a JSON-API validator?

[rgazelot]

What do you think about if your library could be able to validate a given json depending on the JSON-API specification part about creating and updating resources?

I'm using your library to serialize my resources for the output. It could be interesting to use it to validate the incoming data too.

[tobyzerner]

I think that's a great idea for another library, but it's beyond the scope of what I want this library to do. This library is about building documents :)

[tobyzerner]

@rgazelot see #126 (comment)