added a high level protocol/feature - for easy Leader Election or exclusive 
Write Lock creation
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                 Key: ZOOKEEPER-78
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-78
             Project: Zookeeper
          Issue Type: New Feature
          Components: java client
    Affects Versions: 3.0.0
            Reporter: james strachan
         Attachments: writeLock_protocol.patch

Here's a patch which adds a little WriteLock helper class for performing leader 
elections or creating exclusive locks in some directory znode. Note its an 
early cut; am sure we can improve it over time. The aim is to avoid folks 
having to use the low level ZK stuff but provide a simpler high level 
abstraction.

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