tweak the gemspec description and summary
tweak the gemspec description and summary

[ci skip]

songling88/zookeeper,songling88/zookeeper,rickypai/zookeeper,rickypai/zookeeper,rickypai/zookeeper,songling88/zookeeper,songling88/zookeeper,zk-ruby/zookeeper,rickypai/zookeeper,zk-ruby/zookeeper,zk-ruby/zookeeper