Merge apispark

Merge apispark branch to master.

Contains:
- remove fluent api style
- remove swagger annotation extensions
- add --section option on Introspector
- remove JaxrsSpecificationRestlet since we have JaxRsApplicationSpecificationRestlet and since we have removed the swagger 1.1 dependencies.
- add jetty-client in jetty extension depedencies
- fix response entity decoding which was made twice, one by the jetty server and one by the restlet framework
- move DocumentedXXX interfaces in internal package
- Load by the default the SwaggerAnnotationIntrospectionHelper