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

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

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.

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.

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

Design update. Add APIs in Ribbon transport client to support getting max connections in pool and max response time to be used by Hystrix.

Added Fail fast switch on null VIP for DiscoveryEnabledNIWSServerList.