How does one set up a code review using Gitlab? I see it listed as a feature on the Gitlab website, but I can\'t seem to find instructions on how to set one up (For that matter
Yes. Merge requests are how peer reviews are accomplished.
There should be a 'diff' tab that will show the changes of all the commits (mentioned here: http://youtu.be/DyAX8ws5OIc?t=3m2s).
The video also explains nicely how it can be used to peer review.