Added a ?ship-it= parameter to the review requests API resource.

Review Request #2421 — Created June 23, 2011 and submitted

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Reviewers

Added a ?ship-it= parameter to the review requests API resource.

This provides a ?ship_it= parameter to /api/review-requests/ that makes it
easy to locate review requests that either have a Ship It, or have none,
depending on whether 1 or 0 is passed.
Unit tests pass.