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Fix a fairly bad bug in event de-duplication
This is fairly edge-case-y but could bite someone. If you'd set a watch when doing a get that failed because the node didn't exist, any subsequent attempts to set a watch would fail silently, because the client thought that the watch had already been set. We now wrap the operation in the setup_watcher! method, which rolls back the record-keeping of what watches have already been set for what nodes if an exception is raised. This change has the side-effect that certain operations (get,stat,exists?,children) will block event delivery until completion, because they need to have a consistent idea about what events are pending, and which have been delivered. This also means that calling these methods represent a synchronization point between user threads (these operations can only occur serially, not simultaneously).
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