Support Jetty 9 based Jersey Client connector.

I have implemented Jetty 9 based Jersey Client connector (https://java.net/jira/browse/JERSEY-2027) that supports both synchronous and asynchronous client invocation using Jetty 9 Fluent Client (http://www.eclipse.org/jetty/documentation/current/clients.html) API to perform HTTP and HTTPS requests.

Features include Redirect support, Cookies support, Authentication support, Forward proxy support.
Supported HTTP verbs: GET, POST, PUT, DELETE, HEAD, OPTIONS, TRACE, CONNECT, MOVE

Let me know if this looks good.