Design the validator middleware

[whitlockjc]

The swagger-validator middleware in swagger-tools was probably the most useful middleware in swagger-tools. This middleware would do request validation based on your Swagger document, as well as response validation if enabled. This middleware has zero open issues but I'm all ears on suggestions.

[armin-vcg]

Support for JSR-303-compliant custom validators, and integration in codegen would get my project out of the XSD + annotation business. IMHO building rest from a swagger yml is far and away a better solution, but currently not an option because custom validators are not supported.