Fix #39

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.