Changes to add a "fake" PullRequest Object now cause issues with "Real" PullRequest

[bbfelts]

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108b39e

I believe the augmentSchemaWithPullRequestInfo method is no longer needed as the PullRequest object is implemented in the API now. The Rally Extract program (which uses this library) will fail if this method is still in place because the extract requires an ObjectID to create a primary key on the database table. The fields defined in augmentSchemaWithPullRequestInfo don't include ObjectID.