POC: Aggregate enunciate-based REST API into nexus-restdoc-plugin

* build
* start
* browse http://localhost:8081/nexus/nexus-restdoc-plugin/default/docs/index.html

NOTE:  There is now some support in enunciate 1.27 for swagger:

http://enunciate.codehaus.org/module_swagger.html

Still doesn't appear to be usable directly, but its a start at least.