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.
Rename some methods in ClientOptions. Use raw content source for HttpClientRequest if set. Set correct hystrix properties from Ribbon properties. Parse cache key templates.
Merge pull request #104 from allenxwang/2.x-commonclient

Added missing functionality in new Ribbon API
Merge remote-tracking branch 'remotes/netflix/2.x-commonclient' and align the
code base with new interfaces.