Switch to using UglifyJS for JavaScript builds.

UglifyJS is a more dependable minifier that does a better job at
compressing JavaScript files. We have been using a Python fork of jsmin,
which isn't being actively developed, and has had some bad releases that
has broken us. With UglifyJS, we can be more confident in stable
releases from here on out.
Release Review Board 1.7.18.
Add the field mirror_path to RepositoryResource.

This adds the mirror_path field to RepositoryResource. This field
was previously not exposed in the API.

Reviewed at https://reviews.reviewboard.org/r/4897/
Fix a stray comma in RepositoryResource.

This comma was accidentally introduced in a recent change to
RepositoryResource, and broke things. It's now removed.
Fix displaying review requests for a group on a Local Site.

The page showing review requests for a group wasn't passing in the
Local Site, due to a recent change. This meant that those using Local
Sites would get a blank list of review requests when viewing a group.