In 3.0 beta 1, we attempted to make rbintegrations a dependency of

Review Board, which worked fine for the packaging process but created an

issue when building an environment to package rbintegrations. Since

rbintegrations was a hard dependency of Review Board, it created a

circular reference issue.
Now, we only include rbintegrations as a dependency if actively building

a package (through a sdist or bdist command), or if installing

(using install). Setting up a development environment no longer

requires it.

Tested running develop and saw that rbintegrations wasn't a

dependency.
Tested the packaging commands and inspected the package metadata.

rbintegrations was a dependency.