Logical optimizer: push up project

                 Key: PIG-922
                 URL: https://issues.apache.org/jira/browse/PIG-922
             Project: Pig
          Issue Type: New Feature
          Components: impl
    Affects Versions: 0.3.0
            Reporter: Daniel Dai
             Fix For: 0.4.0

This is a continuation work of 
[PIG-697|https://issues.apache.org/jira/browse/PIG-697]. We need to add another 
rule to the logical optimizer: Push up project, ie, prune columns as early as 

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