Pull Request for Work Unit 2 - Merge with Karyon HEAD- Upgrade Karyon Dependencies 

This pull request covers the following 

Merge with HEAD of karyon master:  https://github.com/Netflix/karyon
Deprecate initialization servlet  (should be using HelloWorldComponent.initialize() instead ) 
Upgrade to Servlet 3.0 dependency
Uncomment AsyncServlet and wire into web.xml (after adding servlet 3.0 dependency)