The way that the admin site pages are laid out (in both markup and

styling) is pretty different between Review Board 3.0 and 4.0. The 4.0

way is better in almost every way, but it does make things complicated

for extensions which might want to support both while also having

templates that do more customization than your average form.
This change makes the Review Bot extension detect which version of

Review Board it's on, and render different JS templates with the correct

markup for each.

Ran the Review Bot extension under Review Board 3.0 and 4.0. Saw that

the UI for configuring the extension looked nice and worked correctly on

both versions.