Redirect to review request page after publishing a review.

Review Request #49 — Created June 4, 2007 and submitted

Review Board SVN (deprecated)
When publishing a review, it's not super clear that it actually
worked; all the user sees is the comment dialog disappear.  To
me, it makes a lot of sense to redirect to the new review that
they just added inside the review details page.  Most webapps
seem to work this way -- when you submit changes, they reload
showing you what you just added.

Since we don't easily have the id of the new review, a new
"last-review" anchor is used instead, which is inserted at the
top of the last review in the list.
Submitted a few reviews, checking that it redirected to the
expected place.