JsonLoader/JsonStorage
----------------------

                 Key: PIG-2332
                 URL: https://issues.apache.org/jira/browse/PIG-2332
             Project: Pig
          Issue Type: New Feature
          Components: impl
            Reporter: Daniel Dai
            Assignee: Daniel Dai
             Fix For: 0.10


A JsonLoader/JsonStorage implementation for Pig. This is based on Alan's 
implementation in the book 
(http://ofps.oreilly.com/titles/9781449302641/load_and_store_funcs.html). I 
made some minor changes:
1. Drop the jackson feature requires 1.01+. Since Hadoop 203+ bundles jackson 
1.01, newer feature fails when running on Hadoop 203+.
2. Using Json format for schema. This borrows Dmitry's schema implememtation in 
PigStorage.
3. Some bug fixes.

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