Watch event delivery rules

                 Key: ZOOKEEPER-50
             Project: Zookeeper
          Issue Type: Bug
          Components: java client
            Reporter: Benjamin Reed

We need to make clear in the documentation and enforce in the code the 
following watch event rules:

# A watch event will be delivered once to each watcher, even if it is 
registered multiple times. For example, if the same watch object is used for 
getChildren("/foo", watchObj) and getData("/foo", watchObj, stat) and foo is 
deleted, watchObj will be called once to processed the NodeDeleted event.
# Session events will be delivered to all watchers.

*Note: a watcher is a Watcher object in Java or a (watch function, context) 
pair in C.*

There is currently a bug in the Java client that causes the session 
disconnected event to be delivered twice to the default watcher if the default 
watcher is also used to watch a path. This violates rule 1.

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