Add a simple "user stats" extension that uses the new infobox features.
Review Request #8080 — Created March 28, 2016 and submitted — Latest diff uploaded
This change adds a new extension that populates the extra section of the user
infobox with counts of that user's incoming and outgoing review requests.
Installed and enabled the extension. Hovered over a user and saw counts of
their incoming and outgoing review requests.