[Rumen] Add a driver for Rumen tool 
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                 Key: MAPREDUCE-1912
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1912
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
    Affects Versions: 0.22.0
            Reporter: Amar Kamat
            Assignee: Amar Kamat
             Fix For: 0.22.0


Rumen, as a tool, has 2 entry points :
- Trace builder
- Folder

It would be nice to have a single driver program and have 'trace-builder' and 'folder' as its options. 

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