Add a combiner to improve performance on updatedb
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                 Key: NUTCH-530
                 URL: https://issues.apache.org/jira/browse/NUTCH-530
             Project: Nutch
          Issue Type: Improvement
         Environment: java 1.6
            Reporter: Emmanuel Joke
            Assignee: Emmanuel Joke
             Fix For: 1.0.0


We have a lot of similar links with status "linked" generated at the ouput of 
the map task when we try to update the crawldb based on the segment fetched.

We can use a combiner to improve the performance.

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