Consider adding CORS support in JAX-RS.next

From the JAX-RS users mailing list:

> Currently, when CORS is needed one has to use impl specific code, such
> as:
>
> * [http://docs.jboss.org/resteasy/docs/3.0.7.Final/userguide/html_single/index.html#d4e1290](http://docs.jboss.org/resteasy/docs/3.0.7.Final/userguide/html_single/index.html#d4e1290)
> * [http://cxf.apache.org/docs/jax-rs-cors.html](http://cxf.apache.org/docs/jax-rs-cors.html)
>
> or some custom impl, or "frameworks":
>
> * [http://www.developerscrappad.com/1781/java/java-ee/rest-jax-rs/java-ee-7-jax-rs-2-0-cors-on-rest-how-to-make-rest-apis-accessible-from-a-different-domain/](http://www.developerscrappad.com/1781/java/java-ee/rest-jax-rs/java-ee-7-jax-rs-2-0-cors-on-rest-how-to-make-rest-apis-accessible-from-a-different-domain/)
> * [https://code.google.com/r/sergiobossa-terrastore-kryo/source/browse/src/main/java/terrastore/server/impl/cors/CorsInterceptor.java](https://code.google.com/r/sergiobossa-terrastore-kryo/source/browse/src/main/java/terrastore/server/impl/cors/CorsInterceptor.java)
>
> I think JAX-RS should be having something like this, out of the box.