Merge pull request #8 from allenxwang/master

Fixed issues with SimpleVipAddressResolver and ConfigurationBasedServerList
Merge pull request #9 from allenxwang/master

version and header update
Gradle Release Plugin - pre tag commit:  'ribbon-0.1.5'.
Gradle Release Plugin - new version commit:  'ribbon-0.1.6-SNAPSHOT'.
Make ZoneAwareLoadBalancer's rule object for each zone configurable. Avoid duplicated connection priming at client initialization.
Merge commit '883899d85d1b9536211a3b45591ab7de62a21048'