Support API versioning in content type negotiation

[Mihael Schmidt]

If the REST endpoint is registered with application/vnd.crowbar.v2.5+json and the client requests application/vnd.crowbar.v2.3+json it should be routed to the 2.5 REST point as by semantic versioning 2.5 is compatible with 2.3.

https://dzone.com/articles/best-practice-api-versioning-for-http-rest-interfa