Fix concurrent access error within ServerControllerImpl's m_listeners
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                 Key: PAXWEB-106
                 URL: http://issues.ops4j.org/jira/browse/PAXWEB-106
             Project: Pax Web
          Issue Type: Bug
          Components: WebContainer
    Affects Versions: 0.5.1
            Reporter: Matthew Roy
            Assignee: Matthew Roy
             Fix For: 0.5.1


The m_listeners set within the ServerControllerImpl class in no way protects 
against listeners being added or removed while the notifyListeners is iterating 
over said listeners.  The common approach is to use a CopyOnWriteArraySet, 
which solves the concurrent access error.

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