Feature/expect 100

I've noticed that the HttpClientFactoryBean does not expose the expect continue option.  This is very important in a highly parallelized system. If you are leveraging locks / latches across threads that are blocking and waiting for the another thread to persist an entity so that it can then query it, the expect continue = true will tell the client to return thereby lifting a latching and allowing another thread to process (which is inaccurate behavior as couch will have not persisted yet, nor will it have updated its views).

Thanks.

Dan