Rename module ribbon-client-extensions to ribbon and rename Java packages

Complete dynamic proxy implementation.

Change RequestTemplate to abstract class and some bug fixes

Make RequestTemplate an abstract class. Added test to make sure ClientOptions and Hystrix properties set correctly. Fix the problem that DefaultClientConfigImpl.getPropertyWithType() does not honor archaius property.

Fix the problem that max response timeout is not set correctly with Hystrix. Make RequestTemplate an abstract class to facilitate future additions.

A few questions after looking at MovieServiceInterfaces:
- Hystrix and external cache providers may supply different key templates. How is that handled in annotation?
- How do we handle multiple cache providers in annotation?
- for registerMovieRaw(@Content RawContentSource<Movie> rawMovieContent), @ContentTransformerClass is not required, right?
- How is header handled in annotation?
- Add more HttpMethod (PUT, DELETE, PATCH)

Add test to test future returned from withMeta() API. Remove HttpClient from the public constructor of HttpRequestTemplate.

Address issue #105

Added handling of headers. Make sure Request can be repeatedly executed, but won’t have extra cost of parsing templates or creating HttpClientRequest each time.

code base with new interfaces.

Added missing functionality in new Ribbon API

Rename some methods in ClientOptions. Use raw content source for HttpClientRequest if set. Set correct hystrix properties from Ribbon properties. Parse cache key templates.

Updated API in LoadBalancerExecutor to retry execution on the same server. Added the capability that if the URI is absolute the NettyHttpClient will submit request directly to server without consulting load balancer.

WIP: 2.x commonclient

Change rxnetty version to 0.3.6. Implementation of ResourceGroup. Change to ConfigurationBasedServerList to make the server list part of client configuration.

path and possibly other values if required in the future.