Merge pull request #207 from tbak/2.x

2.x audit service + further work on eureka-client API + example app
Merge pull request #208 from tbak/2.x

The modifications in this commit should be part of the previous one
Upgrade to latest ribbon/rxnetty/karyon version
(2.0-RC9, 0.3.13, 2.1.00-RC5 respectively).