Revision tracking

WHRevision is a subclass of WHTag which provides support for versioning WHTaggable objects. A WHRevision tag represents a particular resource, and can be assigned to another resource to indicate that a resource is a revision of another. Since resources can have multiple tags, a given resource can be a revision of multiple other resources, and a given resource can have multiple revisions (and revisions of revisions, and so on).

WHRevision provides three key methods for handling versioning: makeRevision makes one resource a revision of another; revisionsForResource returns all revisions of a particular resource; and originalsForRevision returns the array of objects a particular revision is a revision of.

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