Merge pull request #23 from allenxwang/master

Issue #22. Also some effort to reduce monitor metrics.
Merge pull request #24 from allenxwang/master

Change zone from static to member variable in ZoneAffinityPredicate as in some cases zone may be set when the instance is created. Change the throw clause from HttpClientResponse to general Exception for easy sub-classing
Gradle Release Plugin - pre tag commit:  'ribbon-0.1.12'.
Gradle Release Plugin - new version commit:  'ribbon-0.1.13-SNAPSHOT'.
modified the addServer method to not modify the array that is passed in.  This can cause issues if you use ImmutableLists for example.
Merge pull request #25 from jdamick/master

addServer to not modify parameter
Add new server list filter to support making only a subset of all servers available for the load balancer.
Merge commit '3d6e4f0ba6a7d7f7f705d4b493937f0d7c18363e'