The schema migration to go with the kitsune cleanup.
Merge pull request #2112 from rlr/migration-for-cleanup

The schema migration to go with the kitsune cleanup.
Fix bug 876706 - Add a "revert to this revision" button to the history diff page
Merge pull request #2116 from a2sheppy/review-diff-revert

Fix bug 876706 - Add a "revert to this revision" button to the history d...
Added doc visits tracking models and search boosting