Improve FilesystemAlterationObserver implementation
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                 Key: JCI-55
                 URL: https://issues.apache.org/jira/browse/JCI-55
             Project: Commons JCI
          Issue Type: Improvement
          Components: fam
    Affects Versions: 1.0
            Reporter: Niall Pemberton


Proposal to factor back into fam's FilesystemAlterationObserverImpl the 
improvements proposed in IO-132:

1) Use a matching array technique to compare previous and current directory 
contents which minimizes object creation
2) Allow FileFilters to be specified to monitor only portions of the file 
system, ignoring files/directories of no interest. This is more efficient and 
reduces the amount of noise from un-wanted file/directory events
3) Add an option to make the observer case-insenstive for file names


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