Add SwaggerFeature to fabric8-forge

[davsclaus]

So the JAX-RS services can output swagger doc of their APIs.

And try to embed the swagger-ui as well, like we have done here
https://github.com/apache/camel/tree/master/platforms/catalog-rest-app

[davsclaus]

This requires a new release of fabric8 which has updated to CXF 3.1.8
fabric8io/fabric8#6622

[davsclaus]

Requires 2.2.184 or newer release of fabric8

[davsclaus]

This requires to update swagger as 1.5.5 is too old and dont work with CXF 3.1.9

[davsclaus]

A PR with a fix
fabric8io/fabric8#6650

[davsclaus]

So we need 2.2.185 release of fabric8 for this