Add normalized discounted cumulative gain to recommender evaluator
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                 Key: MAHOUT-619
                 URL: https://issues.apache.org/jira/browse/MAHOUT-619
             Project: Mahout
          Issue Type: Improvement
          Components: Collaborative Filtering
    Affects Versions: 0.4
            Reporter: Sean Owen
            Assignee: Sean Owen
            Priority: Minor
             Fix For: 0.5


Just tracking a simple improvement: add nDCG to precision and recall 
computations in GenericRecommenderIRStatsEvaluator

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