Add Config Key for indicating whether or not Client Auth is Required

Fix #36

show that when used properly, the client does survive many short-lived requests

update to latest archaius and guava

	 remove jaxrs dep from ribbon-core by making response headers multimap

Deprecate AbstractLoadBalancerAwareClient.getDefaultPort() and replace with getDefaultPortFromScheme(String) with a default implementation.

update to latest gradle template

Deprecate AbstractLoadBalancerAwareClient.getDefaultPort() and replace with getDefaultPortFromScheme(String) with a default implementation.

Make DynamicServerListLoadBalancer.updateListOfServers() public to provide alternative way to update servers at runtime instead of relying on scheduler.

Make DynamicServerListLoadBalancer.updateListOfServers() public to provide alternative way to update servers at runtime instead of relying on scheduler.

Add subset filter for server list

Add new server list filter to support making only a subset of all servers available for the load balancer.

addServer to not modify parameter

modified the addServer method to not modify the array that is passed in.  This can cause issues if you use ImmutableLists for example.