Add helper wrapper classes for StoreFunc
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                 Key: PIG-2538
                 URL: https://issues.apache.org/jira/browse/PIG-2538
             Project: Pig
          Issue Type: Improvement
            Reporter: Bill Graham
            Assignee: Bill Graham


We find ourselves wrapping {{StoreFuncs}} often and have written a 
{{StoreFuncDecorator}} and a {{StoreMetadataDecorator}} class. These make it 
easy to subclass and decorate only select {{StoreFuncs}} methods.

This is conceptually similar to the wrapper helpers in the Java servlet API: 
http://docs.oracle.com/javaee/5/api/javax/servlet/ServletRequestWrapper.html
http://docs.oracle.com/javaee/5/api/javax/servlet/ServletResponseWrapper.html

I think these would make useful additions to Pig.

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