Fixed bug in review deletion
Fixed bug in review deletion

When a review was not the latest it would cause a bug on deletion of the
latest. We changed the logic to work with the latest vote versus the previous
to fix this issue. Now all review deletion ensure a consistent latest vote
state.

PyCon/pycon,njl/pycon,pyconjp/pyconjp-website,njl/pycon,osmfj/sotmjp-website,njl/pycon,Diwahars/pycon,PyCon/pycon,pyconjp/pyconjp-website,PyCon/pycon,eldarion/pycon,PyCon/pycon,eldarion/pycon,Diwahars/pycon,eldarion/pycon,osmfj/sotmjp-website,smellman/sotmjp-website,smellman/sotmjp-website,pyconjp/pyconjp-website,Diwahars/pycon,Diwahars/pycon,pyconjp/pyconjp-website,osmfj/sotmjp-website,osmfj/sotmjp-website,smellman/sotmjp-website,njl/pycon,smellman/sotmjp-website