find Max Tuple by 1st field UDF (for piggybank)

                 Key: PIG-620
             Project: Pig
          Issue Type: New Feature
          Components: impl
    Affects Versions: types_branch
            Reporter: Vadim Zaliva
             Fix For: types_branch

This is simple UDF which takes bag of tuples and returns one with max. 1st 
It is fairly trivial but I have seen people asking for it. Detailed usage 
comments are in Javadoc.

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